CN110645674A - Air conditioner filter screen replacement detection method and device - Google Patents

Air conditioner filter screen replacement detection method and device Download PDF

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CN110645674A
CN110645674A CN201910869518.1A CN201910869518A CN110645674A CN 110645674 A CN110645674 A CN 110645674A CN 201910869518 A CN201910869518 A CN 201910869518A CN 110645674 A CN110645674 A CN 110645674A
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pressure
value
pressure value
filter screen
air conditioner
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CN110645674B (en
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吴立智
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Anhui Bo Bo Intelligent Technology Co Ltd
Anhui Meibo Intelligent Technology Co Ltd
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Anhui Bo Bo Intelligent Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/39—Monitoring filter performance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/40—Pressure, e.g. wind pressure

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

Abstract

The invention discloses a method and a device for detecting replacement of a filter screen of an air conditioner, wherein a pressure threshold is dynamically set, a temperature threshold is added for judgment, a pressure value is collected only at a temperature approximately stable to room temperature, pressure values of the air inlet side and the air outlet side of the current filter screen are collected, precision correction is carried out on the collected first pressure value, so that the data precision is higher, the fan reversal frequency is reduced, the precision of the collected physical quantity signal can be corrected when the air conditioner is in a natural wind mode, an automatic mode and a sleep mode, frequent reversal of the fan is avoided, the energy consumption is reduced, and the user experience is improved.

Description

Air conditioner filter screen replacement detection method and device
Technical Field
The disclosure relates to the technical field of air conditioner abnormity monitoring, in particular to a method and a device for detecting replacement of an air conditioner filter screen.
Background
Along with the manufacturing cost of air conditioner constantly reduces and air conditioning technology's development, the air conditioner has become the indispensable temperature control instrument of people gradually, and the air conditioner live time overlength, the dirty stifled problem of leading to of reasons such as the dust is too much can appear to make the effect of heating or refrigeration obviously descend, and force the user to raise the temperature or reduce the temperature in order to reach original normal comfort level, thereby lead to the energy consumption grow. The excessive dust is also unfavorable for the health of a user, and whether the air conditioner filter screen is dirty or not is checked manually, so that the air conditioner is too subjective, the air conditioner cover is difficult to disassemble due to the complex structure of the air conditioner, the labor cost is needed, the use is inconvenient, and the user experience is seriously reduced; thus, chinese patent publication no: the method and the device for detecting the air conditioner filter screen, the storage medium and the air conditioner disclosed by CN108050649A judge whether the air conditioner filter screen needs to be replaced and/or cleaned or not according to the room particulate matter concentration and the running time of a fan; another chinese patent publication No.: CN106500275A discloses a dust removing method for a filter screen of an air conditioner and an air conditioner, in which a first pressure value P0 at the air inlet side and a second pressure value P1 at the air outlet side of a current filter screen are detected at intervals of time T, and a first difference PX is calculated to reverse a fan. The technical scheme of the invention can conveniently and quickly remove the dust on the filter screen. The first kind is for carrying out the accurate filter screen of reminding of changing through detecting room particulate matter concentration and cleaning time count, and another kind is for through detecting current filter screen wind pressure value, and then makes the fan reversal initiatively clear away the dust of filter screen. However, when the air conditioner is in a natural wind mode, an automatic mode and a sleep mode, because the air supply is not continuous, the acquired physical quantity signals are not accurate, and especially in the second mode, the fan is easy to frequently rotate reversely, so that the energy consumption is increased; the first case is the frequent occurrence of false alarms.
Disclosure of Invention
In order to solve the above problems, the present disclosure provides a method and an apparatus for detecting replacement of a filter screen of an air conditioner, in which a pressure threshold is dynamically set and a temperature threshold is added for determination, a pressure value is collected only at a temperature approximately stable to room temperature, pressure values of an air inlet side and an air outlet side of a current filter screen are collected, and a precision correction is performed on a collected first pressure value, so that data precision is higher, and a fan reversal frequency is reduced.
In order to achieve the above object, according to an aspect of the present disclosure, there is provided an air conditioner filter screen replacement detection method, including:
step 1, respectively arranging a differential pressure sensor and a temperature sensor on the air inlet side and the air outlet side of a filter screen of an air conditioner;
step 2, after the air conditioner is started, collecting the temperature of the air inlet side and the temperature of the air outlet side, calculating the difference value between the temperature of the air inlet side and the temperature of the air outlet side to be used as a temperature difference value, simultaneously collecting a first pressure value of the air inlet side of the filter screen and a second pressure value of the air outlet side when the air conditioner is started, and calculating the difference value between the first pressure value and the second pressure value to be used as a first pressure threshold value;
step 3, when the temperature difference value is smaller than a preset temperature difference threshold value, acquiring a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen, performing precision correction on the acquired third pressure value and fourth pressure value, and obtaining a first corrected pressure value and a second corrected pressure value after correction;
step 4, calculating a difference value between the first correction pressure value and the second correction pressure value as a correction pressure difference value of the filter screen;
and 5, comparing the corrected pressure difference value with the first pressure threshold and a prestored second pressure threshold, and if the corrected pressure difference value is greater than or equal to the first pressure threshold and less than the second pressure threshold, reversing the fan of the air conditioner to blow air from the air outlet side of the filter screen to the air inlet side.
Further, in step 1, the air conditioner includes a heat exchange air duct, a fan is arranged in the heat exchange air duct, the air duct is provided with an air inlet, a filter screen is arranged in the air duct, the air conditioner further includes a controller, and a pressure difference sensor and a temperature sensor which are arranged on two sides of the filter screen and connected with the controller, one side of the filter screen facing the air inlet is an air inlet side, and the other side of the filter screen not facing the air inlet is an air outlet side.
Further, in step 2, the method for collecting the temperature of the air inlet side and the temperature of the air outlet side is to collect the temperature by temperature sensors arranged on the air inlet side and the air outlet side of the filter screen.
Further, in step 2, the method for acquiring the first pressure value of the air inlet side and the second pressure value of the air outlet side of the filter screen when the air conditioner is started is to acquire the pressure values through a pressure difference sensor arranged on the air inlet side and the air outlet side of the filter screen, wherein the pressure value acquired on the air inlet side is the first pressure value, and the pressure value acquired on the air outlet side is the second pressure value.
Further, in step 3, the preset temperature difference threshold is 5 ℃, and can be manually adjusted.
Further, in step 3, collecting a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen as the pressure value of the air inlet side and the pressure value of the air outlet side when the temperature difference value is smaller than the preset temperature difference threshold value,
further, in step 3, the method for performing precision correction on the collected third pressure value and the fourth pressure value includes: the third pressure value and the fourth pressure value are collectively called as pressure values, the acquired pressure value data is a continuous function x (T), T is an acquisition time point, and the variation condition of the pressure value data in a time period delta T can be obtained by differentiating x (T), namely
Figure BDA0002202351420000021
The array formed by the sequence formed by the pressure value data collected according to the time sequence in the time period delta T is a pressure array xiI is an array subscript; the slope of the regression line is obtained by the least square method for the pressure array, namely the pressure change speed, the pressure change speed is the change speed in the delta T time period, and when the delta T time period is less than 1 second, the average acceleration threshold value is recorded
Figure BDA0002202351420000022
Figure BDA0002202351420000031
tiFor the current pressure value data xiThe acquisition time of (1);
the above formula is simplified as follows:
where Δ T is the time period to be from the current timeLength, Δ T, n, is constant, T0For the pressure information acquisition interval, Δ T defaults to 60 seconds.
Calculating a pressure change speed threshold
Figure BDA0002202351420000033
In order to realize the purpose,
Figure BDA0002202351420000034
where j is 1,2, …, m, m being the number of times pressure value data is acquired in the time period Δ T;
let the time period of the pressure information acquisition interval be T0When T is0>Δt0When, Δ t0Is a minimum time threshold, Δ t0Can be manually set, is set to be 30 milliseconds by default, and pressure value information is set every T0The interval of time is updated once, and the factor influencing the precision is T0＝max{T0，Δt0I.e. the update time delay of the pressure value data, the information obtained is actually T from this moment0The position coordinate of the previous time and the precision correction formula are
Figure BDA0002202351420000035
x (t) is the actual pressure value data collected at the time point t, and P is the pressure value data after precision correction.
Further, when the real-time correction pressure difference value is smaller than or equal to the first pressure threshold value, the reverse rotation of the fan is finished, and the normal working mode is entered.
Further, the second pressure threshold value stored in advance is 5kPa to 20 kPa.
The difference value is the difference therebetween in this disclosure.
The invention also provides a device for replacing and detecting the filter screen of the air conditioner, which comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to operate in the units of:
the air conditioner comprises a data initialization unit, a first pressure value calculation unit and a second pressure value calculation unit, wherein the data initialization unit is used for collecting the temperature of an air inlet side and the temperature of an air outlet side and calculating the difference value of the temperature of the air inlet side and the temperature of the air outlet side as a temperature difference value after the air conditioner is started, meanwhile, collecting the first pressure value of the air inlet side of a filter screen and the second pressure value of the air outlet side when the air conditioner is started, and calculating the difference value of the first pressure value and the second pressure;
the pressure value correction unit is used for collecting a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen when the temperature difference value is smaller than a preset temperature difference threshold value, performing precision correction on the collected third pressure value and the collected fourth pressure value, and obtaining a first corrected pressure value and a second corrected pressure value after correction;
the pressure difference value calculating unit is used for calculating the difference value between the first correction pressure value and the second correction pressure value as the correction pressure difference value of the filter screen;
and the filter screen ash removal unit is used for comparing the corrected pressure difference value with the first pressure threshold value and a prestored second pressure threshold value, and reversing the fan of the air conditioner if the corrected pressure difference value is greater than or equal to the first pressure threshold value and less than the second pressure threshold value.
The beneficial effect of this disclosure does: the invention provides a method and a device for detecting replacement of a filter screen of an air conditioner, which can correct the precision of a collected physical quantity signal when the air conditioner is in a natural wind mode, an automatic mode and a sleep mode, avoid frequent reversal of a fan, reduce energy consumption and improve user experience.
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The foregoing and other features of the present disclosure will become more apparent from the detailed description of the embodiments shown in conjunction with the drawings in which like reference characters designate the same or similar elements throughout the several views, and it is apparent that the drawings in the following description are merely some examples of the present disclosure and that other drawings may be derived therefrom by those skilled in the art without the benefit of any inventive faculty, and in which:
FIG. 1 is a flow chart of a method for detecting replacement of a filter screen of an air conditioner;
fig. 2 is a diagram of a device for detecting replacement of a filter screen of an air conditioner.
Detailed Description
The conception, specific structure and technical effects of the present disclosure will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, aspects and effects of the present disclosure. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Descriptions in this specification as relating to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to any indicated technical feature or quantity. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a flowchart illustrating a method for detecting replacement of an air conditioner filter according to the present disclosure, and a method for detecting replacement of an air conditioner filter according to an embodiment of the present disclosure is described below with reference to fig. 1.
The utility model provides an air conditioner filter screen replacement detection method, which comprises the following steps:
step 1, respectively arranging a differential pressure sensor and a temperature sensor on the air inlet side and the air outlet side of a filter screen of an air conditioner;
step 2, after the air conditioner is started, collecting the temperature of the air inlet side and the temperature of the air outlet side, calculating the difference value between the temperature of the air inlet side and the temperature of the air outlet side to be used as a temperature difference value, simultaneously collecting a first pressure value of the air inlet side of the filter screen and a second pressure value of the air outlet side when the air conditioner is started, and calculating the difference value between the first pressure value and the second pressure value to be used as a first pressure threshold value;
step 3, when the temperature difference value is smaller than a preset temperature difference threshold value, acquiring a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen, performing precision correction on the acquired third pressure value and fourth pressure value, and obtaining a first corrected pressure value and a second corrected pressure value after correction;
step 4, calculating a difference value between the first correction pressure value and the second correction pressure value as a correction pressure difference value of the filter screen;
and 5, comparing the corrected pressure difference value with the first pressure threshold and a prestored second pressure threshold, and if the corrected pressure difference value is greater than or equal to the first pressure threshold and less than the second pressure threshold, reversing the fan of the air conditioner to blow air from the air outlet side of the filter screen to the air inlet side.
Further, in step 1, the air conditioner includes a heat exchange air duct, a fan is arranged in the heat exchange air duct, the air duct is provided with an air inlet, a filter screen is arranged in the air duct, the air conditioner further includes a controller, and a pressure difference sensor and a temperature sensor which are arranged on two sides of the filter screen and connected with the controller, one side of the filter screen facing the air inlet is an air inlet side, and the other side of the filter screen not facing the air inlet is an air outlet side.
Further, in step 2, the method for collecting the temperature of the air inlet side and the temperature of the air outlet side is to collect the temperature by temperature sensors arranged on the air inlet side and the air outlet side of the filter screen.
Further, in step 2, the method for acquiring the first pressure value of the air inlet side and the second pressure value of the air outlet side of the filter screen when the air conditioner is started is to acquire the pressure values through a pressure difference sensor arranged on the air inlet side and the air outlet side of the filter screen, wherein the pressure value acquired on the air inlet side is the first pressure value, and the pressure value acquired on the air outlet side is the second pressure value.
Further, in step 3, the preset temperature difference threshold is 5 ℃, and can be manually adjusted.
Further, in step 3, collecting a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen as the pressure value of the air inlet side and the pressure value of the air outlet side when the temperature difference value is smaller than the preset temperature difference threshold value,
further, in step 3, the precision correction is performed on the third pressure value and the fourth pressure value which are acquiredThe positive method comprises the following steps: the third pressure value and the fourth pressure value are collectively called as pressure values, the acquired pressure value data is a continuous function x (T), T is an acquisition time point, and the variation condition of the pressure value data in a time period delta T can be obtained by differentiating x (T), namely
Figure BDA0002202351420000051
The array formed by the sequence formed by the pressure value data collected according to the time sequence in the time period delta T is a pressure array xiI is an array subscript; the slope of the regression line is obtained by the least square method for the pressure array, namely the pressure change speed, the pressure change speed is the change speed in the delta T time period, and when the delta T time period is less than 1 second, the average acceleration threshold value is recorded
Figure BDA0002202351420000061
Figure BDA0002202351420000062
tiFor the current pressure value data xiThe acquisition time of (1);
the above formula is simplified as follows:
Figure BDA0002202351420000063
where Δ T is the length of the time period to be from the current time, Δ T, n is constant, and T0For the pressure information acquisition interval, Δ T defaults to 60 seconds.
The threshold pressure change speed is calculated as,
Figure BDA0002202351420000064
where j is 1,2, …, m, m being the number of times pressure value data is acquired in the time period Δ T;
let the time period of the pressure information acquisition interval be T0When T is0>Δt0When, Δ t0Is a minimum time threshold, Δ t0Can be manually set, is set to be 30 milliseconds by default, and pressure value information is set every T0The interval of time is updated once, and the factor influencing the precision is T0＝max{T0，Δt0I.e. the update time delay of the pressure value data, the information obtained is actually T from this moment0The position coordinate of the previous time and the precision correction formula are
Figure BDA0002202351420000065
x (t) is the actual pressure value data collected at the time point t, and P is the pressure value data after precision correction.
Further, when the real-time correction pressure difference value is smaller than or equal to the first pressure threshold value, the reverse rotation of the fan is finished, and the normal working mode is entered.
Further, the second pressure threshold value stored in advance is 5kPa to 20 kPa.
The difference value is the difference therebetween in this disclosure.
The detection device is changed to air conditioner filter screen that embodiment of this disclosure provides, as shown in fig. 2 is a detection device is changed to air conditioner filter screen of this disclosure picture, and a detection device is changed to air conditioner filter screen of this embodiment includes: the air conditioner filter screen replacement detection device comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the steps in the air conditioner filter screen replacement detection device embodiment.
The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to operate in the units of:
the air conditioner comprises a data initialization unit, a first pressure value calculation unit and a second pressure value calculation unit, wherein the data initialization unit is used for collecting the temperature of an air inlet side and the temperature of an air outlet side and calculating the difference value of the temperature of the air inlet side and the temperature of the air outlet side as a temperature difference value after the air conditioner is started, meanwhile, collecting the first pressure value of the air inlet side of a filter screen and the second pressure value of the air outlet side when the air conditioner is started, and calculating the difference value of the first pressure value and the second pressure;
the pressure value correction unit is used for collecting a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen when the temperature difference value is smaller than a preset temperature difference threshold value, performing precision correction on the collected third pressure value and the collected fourth pressure value, and obtaining a first corrected pressure value and a second corrected pressure value after correction;
the pressure difference value calculating unit is used for calculating the difference value between the first correction pressure value and the second correction pressure value as the correction pressure difference value of the filter screen;
and the filter screen ash removal unit is used for comparing the corrected pressure difference value with the first pressure threshold value and a prestored second pressure threshold value, and reversing the fan of the air conditioner if the corrected pressure difference value is greater than or equal to the first pressure threshold value and less than the second pressure threshold value.
The air conditioner filter screen replacement detection device can be operated in computing equipment such as desktop computers, notebooks, palm computers and cloud servers. The device for detecting the replacement of the filter screen of the air conditioner can be operated by a processor and a memory. It will be understood by those skilled in the art that the example is merely an example of an airscreen replacement detecting device, and does not constitute a limitation of an airscreen replacement detecting device, and may include more or less components than the air-conditioner filter, or combine some components, or different components, for example, the airscreen replacement detecting device may further include an input/output device, a network access device, a bus, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general processor can be a microprocessor or the processor can be any conventional processor, and the processor is a control center of the air conditioner filter screen replacement detection device operation device, and various interfaces and lines are used for connecting all parts of the whole air conditioner filter screen replacement detection device operation device.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the air conditioner filter screen replacement detection device by running or executing the computer program and/or the module stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
While the present disclosure has been described in considerable detail and with particular reference to a few illustrative embodiments thereof, it is not intended to be limited to any such details or embodiments or any particular embodiments, but it is to be construed as effectively covering the intended scope of the disclosure by providing a broad, potential interpretation of such claims in view of the prior art with reference to the appended claims. Furthermore, the foregoing describes the disclosure in terms of embodiments foreseen by the inventor for which an enabling description was available, notwithstanding that insubstantial modifications of the disclosure, not presently foreseen, may nonetheless represent equivalent modifications thereto.

Claims (8)

1. A method for detecting replacement of a filter screen of an air conditioner is characterized by comprising the following steps:
step 1, respectively arranging a differential pressure sensor and a temperature sensor on the air inlet side and the air outlet side of a filter screen of an air conditioner;
step 2, after the air conditioner is started, collecting the temperature of the air inlet side and the temperature of the air outlet side, calculating the difference value between the temperature of the air inlet side and the temperature of the air outlet side to be used as a temperature difference value, simultaneously collecting a first pressure value of the air inlet side of the filter screen and a second pressure value of the air outlet side when the air conditioner is started, and calculating the difference value between the first pressure value and the second pressure value to be used as a first pressure threshold value;
step 3, when the temperature difference value is smaller than a preset temperature difference threshold value, acquiring a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen, performing precision correction on the acquired third pressure value and fourth pressure value, and obtaining a first corrected pressure value and a second corrected pressure value after correction;
step 4, calculating a difference value between the first correction pressure value and the second correction pressure value as a correction pressure difference value of the filter screen;
and 5, comparing the corrected pressure difference value with the first pressure threshold and a prestored second pressure threshold, and reversing the fan of the air conditioner if the corrected pressure difference value is greater than or equal to the first pressure threshold and less than the second pressure threshold.
2. The method for detecting replacement of the filter screen of the air conditioner according to claim 1, wherein in step 1, the air conditioner comprises a heat exchange air duct, a fan is arranged in the heat exchange air duct, the air duct has an air inlet, the filter screen is arranged in the air duct, and the air conditioner further comprises a controller, and a pressure difference sensor and a temperature sensor which are connected with the controller and are arranged on two sides of the filter screen.
3. The method for detecting replacement of a filter screen of an air conditioner according to claim 2, wherein in step 2, the method for acquiring the first pressure value at the air inlet side and the second pressure value at the air outlet side of the filter screen at the start of the air conditioner is to acquire the pressure values by a pressure difference sensor arranged at the air inlet side and the air outlet side of the filter screen, the pressure value acquired at the air inlet side is the first pressure value, and the pressure value acquired at the air outlet side is the second pressure value.
4. The method as claimed in claim 3, wherein in step 3, the predetermined temperature difference threshold is 5 ℃, and the temperature difference threshold can be adjusted manually.
5. The air conditioner filter screen replacement detection method according to claim 4, wherein in the step 3, the method for performing precision correction on the collected third pressure value and the fourth pressure value comprises the following steps: the third pressure value and the fourth pressure value are collectively called as pressure values, the acquired pressure value data is a continuous function x (T), T is an acquisition time point, and the variation condition of the pressure value data in a time period delta T can be obtained by differentiating x (T), namely
Figure FDA0002202351410000011
The array formed by the sequence formed by the pressure value data collected according to the time sequence in the time period delta T is a pressure array xiI is an array subscript; the slope of the regression line is obtained by the least square method for the pressure array, namely the pressure change speed, the pressure change speed is the change speed in the delta T time period, and when the delta T time period is less than 1 second, the average acceleration threshold value is recorded
Figure FDA0002202351410000021
Figure FDA0002202351410000022
tiFor the current pressure value data xiThe acquisition time of (1);
the above formula is simplified as follows:
Figure FDA0002202351410000023
where Δ T is the length of the time period to be from the current time, Δ T, n is constant, and T0For the pressure information acquisition interval, Δ T defaults to 60 seconds;
the threshold pressure change speed is calculated as,where j is 1,2, …, m, m being the number of times pressure value data is acquired in the time period Δ T; let the time period of the pressure information acquisition interval be T0When T is0>Δt0When, Δ t0Is a minimum time threshold, Δ t0Can be manually set, is set to be 30 milliseconds by default, and pressure value information is set every T0The interval of time is updated once, and the factor influencing the precision is T0＝max{T0，Δt0I.e. the update time delay of the pressure value data, the information obtained is actually T from this moment0The position coordinate of the previous time and the precision correction formula are
Figure FDA0002202351410000025
x (t) is the actual pressure value data collected at the time point t, and P is the pressure value data after precision correction.
6. The air conditioner filter screen replacement detection method according to claim 5, wherein when the real-time correction pressure difference value is less than or equal to the first pressure threshold, the fan is turned reversely and enters a normal operation mode.
7. The air conditioner filter screen replacement detecting method according to claim 6, wherein in step 3, the second pre-stored pressure threshold is 5kPa to 20 KPa.
8. The utility model provides an air conditioner filter screen changes detection device which characterized in that, the device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to operate in the units of:
the air conditioner comprises a data initialization unit, a first pressure value calculation unit and a second pressure value calculation unit, wherein the data initialization unit is used for collecting the temperature of an air inlet side and the temperature of an air outlet side and calculating the difference value of the temperature of the air inlet side and the temperature of the air outlet side as a temperature difference value after the air conditioner is started, meanwhile, collecting the first pressure value of the air inlet side of a filter screen and the second pressure value of the air outlet side when the air conditioner is started, and calculating the difference value of the first pressure value and the second pressure;
the pressure value correction unit is used for collecting a third pressure value of the air inlet side and a fourth pressure value of the air outlet side of the current filter screen when the temperature difference value is smaller than a preset temperature difference threshold value, performing precision correction on the collected third pressure value and the collected fourth pressure value, and obtaining a first corrected pressure value and a second corrected pressure value after correction;
the pressure difference value calculating unit is used for calculating the difference value between the first correction pressure value and the second correction pressure value as the correction pressure difference value of the filter screen;
and the filter screen ash removal unit is used for comparing the corrected pressure difference value with the first pressure threshold value and a prestored second pressure threshold value, and reversing the fan of the air conditioner if the corrected pressure difference value is greater than or equal to the first pressure threshold value and less than the second pressure threshold value.
CN201910869518.1A 2019-09-16 2019-09-16 Dust removing method and device for air conditioner filter screen Active CN110645674B (en)

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