CN111256289A - Filter screen filth blockage detection method - Google Patents
Filter screen filth blockage detection method Download PDFInfo
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- CN111256289A CN111256289A CN202010096920.3A CN202010096920A CN111256289A CN 111256289 A CN111256289 A CN 111256289A CN 202010096920 A CN202010096920 A CN 202010096920A CN 111256289 A CN111256289 A CN 111256289A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/39—Monitoring filter performance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—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
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Abstract
The invention discloses a filter screen filth blockage detection method, relates to the technical field of air conditioning, and is used for solving the problems that the filter screen filth blockage detection precision is low and filter screen filth blockage misjudgment exists in the existing filter screen filth blockage detection method. The invention provides a filter screen filth blockage detection method which is applied to air treatment equipment and comprises the following steps: a detection step, comprising: calculating to obtain actual load torque according to a load torque observer of a motor in the fan; calculating to obtain a current wind resistance value according to the actual load torque; and comparing the current wind resistance value with a preset wind resistance value, and if the current wind resistance value is less than or equal to the preset wind resistance value, determining that dirty blockage occurs in the filter screen. The filter screen filth blockage detection method is used for detecting whether the filter screen in the air treatment equipment is filth blocked.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a method for detecting filth blockage of a filter screen.
Background
The air conditioner filter screen is an important device for filtering air impurities and preventing dust from entering an evaporator of the indoor unit, and when the air conditioner is used for a long time and the air conditioner filter screen is not cleaned, the air conditioner filter screen is full of dust and impurities, so that the air intake of the indoor unit of the air conditioner is influenced, the refrigerating and heating effects of the air conditioner are poor, and the power consumption of the air conditioner is increased under the same load requirement; and many bacteria can be bred on the air-conditioning filter screen, peculiar smell is generated, and therefore indoor air quality is reduced, and troubles are brought to family life of users.
The filter screen filth blockage detection method in the prior art comprises the following steps: controlling a fan of an indoor unit of an air conditioner to run to a set windshield, detecting the current of the fan in the actual running process according to the set windshield, and detecting the preset filth blockage current of the fan when a filter screen is filth-blocked and the fan runs according to the set windshield; comparing the current with a preset filth blockage current, and determining that a filter screen arranged at an air inlet in the air conditioner is filth blocked when the current is less than or equal to the preset filth blockage current.
The filter screen filth blockage detection method compares the detected current of the fan with the preset filth blockage current, and the common current detection device comprises: and the sampling circuit consists of a current transformer, a current sensor or a sampling resistor. However, if the current of the fan is collected through the current transformer or the current sensor, the current transformer and the current sensor have errors during manufacturing, which may cause errors in the current collected through the above device, and the collection result may be affected by the surrounding environment and the detection accuracy and the service life of the current transformer and the current sensor, which may cause errors between the collected current and the real current.
Disclosure of Invention
The invention provides a filter screen filth blockage detection method, which is used for solving the problems of low filter screen filth blockage detection precision and filter screen filth blockage misjudgment in the conventional filter screen filth blockage detection method.
In order to achieve the purpose, the method for detecting filth blockage of the air conditioner filter screen provided by the invention comprises the following steps: obtaining a load torque according to a load torque observer of a motor in the fan, and calculating a current wind resistance value according to the load torque; and comparing the current wind resistance value with a preset wind resistance value, and if the current wind resistance value is less than or equal to the preset wind resistance value, determining that dirty blockage occurs in the filter screen.
Compared with the prior art, the filter screen dirty blockage detection method provided by the embodiment of the invention judges the dirty blockage condition of the filter screen according to the wind resistance value obtained by calculating the actual load torque, because the actual load torque is obtained by calculating according to the load torque observer, the current is compensated by adopting the state feedback gain matrix in the calculation process of the observed load torque, the current error is corrected, the error of the observed load torque calculated according to the corrected current value is smaller, the accuracy of the actual load torque is higher, the wind resistance value is closer to the actual wind resistance value, namely, the wind resistance value can accurately reflect the dirty blockage condition of the filter screen, so that the detection precision of the dirty blockage detection of the filter screen is improved, and the risk of the filter screen generating dirty blockage misjudgment action is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for detecting filth blockage of a filter screen according to an embodiment of the present invention;
FIG. 2 is a flow chart of the degree of filth blockage of a filter screen according to an embodiment of the present invention;
FIG. 3 is a flow chart of a filter screen with mild filth blockage according to an embodiment of the present invention;
fig. 4 is a flow chart of the filter screen severe filth blockage according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, "and/or" is only one kind of association relationship describing an association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
With the development of the air conditioner to health and energy conservation, the newly added functions of the air conditioner are related to health more and more. The air conditioner filter screen is a core component of the air conditioner, the filth blockage of the air conditioner filter screen can reduce the air output of the air conditioner and influence the performance of the air conditioner, a plurality of bacteria can be bred on the air conditioner filter screen, the bacteria are scattered indoors along with the air output of the air conditioner and can cause harm to human health, and the indoor air conditioner filter screen is enabled to have special peculiar smell, so that the cleanness of the air conditioner filter screen is very important to maintain.
Referring to fig. 1, a method for detecting filth blockage of a filter screen according to an embodiment of the present invention includes: a detection step, wherein the detection step comprises: according to a load torque observer of a motor in the fan, calculating to obtain an actual load torque TL(ii) a According to the actual load torque TLCalculating to obtain a current wind resistance value f; and comparing the current wind resistance value f with a preset wind resistance value, and if the current wind resistance value f is less than or equal to the preset wind resistance value, determining that dirty blockage occurs in the filter screen. The above-described calculation of the actual load torque TLThe operation of the wind resistance value f can be executed by a control module in a main controller in the air treatment equipment, and can also be executed by a specially arranged sub-controller for detecting filth blockage of the filter screen in the air treatment equipment; the controller comprises a storage module, and the storage module is used for storing a preset wind resistance value.
Compared with the prior art, the filter screen filth blockage detection method provided by the embodiment of the invention is based on the actual load torque TLThe dirty blocking condition of the filter screen is judged according to the wind resistance value f obtained by calculation, and the actual load torque TLIs obtained by calculating according to a load torque observer and observing the load torque
In the calculation process, the current is compensated by adopting the state feedback gain matrix K, the current error is corrected, and the observed load torque calculated according to the corrected current value
Is small, the actual load torque TLThe accuracy of (2) is higher, and this windage value f can be more close actual windage value, and this windage value f can be accurate the dirty stifled condition of reflection filter screen promptly to improve the detection precision to the dirty stifled detection of filter screen, reduced the risk that the filter screen takes place dirty stifled misjudgement action. Wherein, because the above-mentioned filter screen is when specifically using, usually set up in the air intake department of the air treatment equipment, if calculate get wind resistance value f less than or equal to preserve wind resistance value, show that the amount of wind from the air intake of the air treatment equipment is minor, namely install the filter screen that is sent out in the air intake department of the air treatment equipment promptlyThe viscera are blocked.
It should be noted that: the wind resistance value f is calculated as follows:
(1) calculating electromagnetic torque TeElectromagnetic torque TeThe formula of (1) is as follows:
Te＝Pn(ψfiq+(Ld-Lq)iqid)
wherein the electromagnetic torque TeHas the unit of (N.m), LdIs a direct axis inductor with the unit of H, LqIs quadrature axis inductance with the unit of H, psifThe amplitude of the flux linkage produced by the permanent magnet is given in Wb, PnIs the number of pole pairs, i, of the motordIs the direct component of the stator current, in units of A, iqIs stator current quadrature component in A, L in the above formulad、Lq、ψf、PnObtainable by specification parameters of the motor, id、iqCan be calculated from the current of the motor.
(2) Calculating the electromagnetic torque TeAs an input value of the load torque observer, an actual load torque T is calculated by the load torque observerLThe load torque observer is:
in the above formula, A is a state matrix, B is a control matrix, C is an output matrix, K is a state feedback gain matrix,
is the estimated state variable, u is the input to the system, y is the actual mechanical angular velocity,
to observe the mechanical angular velocity.
Wherein the content of the first and second substances,
C＝[10]，
u＝Te，y＝Ωr，
the observation error is:
wherein e is an observation error,
for error observation, J is moment of inertia, omegarIn order to be able to achieve the actual mechanical angular velocity,
in order to observe the mechanical angular velocity, the characteristic equation is as follows:
det[sI-(A-KC)]＝s2+(k1+B/J)s-k2/J＝0
selecting proper K so that (A-KC) has stability and proper characteristic value, setting expected poles α and β, s as auxiliary operation variables in Laplace transformation, and I as a second-order unit matrix, and then the expected characteristic polynomial of the observer is as follows:
s2-(α+β)s+αβ＝0
the following can be obtained:
then, the load torque observer can be written as:
the observed load torque can be obtained by the above formula
And actual load torque TLThe relationship between them is:
(3) the actual load torque T calculated according to the formulaLThe wind resistance value is obtained through calculation of a fan load formula, and the fan load formula is as follows:
TL＝Ωr 2f
wherein f is the wind resistance value omegarFor mechanical angular velocity, the formula for obtaining the wind resistance value f is:
further, in the method for detecting filth blockage of a filter screen in the embodiment of the present invention, if the current wind resistance value f is less than or equal to the preset wind resistance value, it is determined that filth blockage occurs in the filter screen, and the method specifically includes: if the current wind resistance value f is less than or equal to the first preset wind resistance value f1And is greater than the second preset wind resistance value f2Determining that the filter screen is slightly filthy blocked; if the current wind resistance value f is less than or equal to a second preset wind resistance value f2And is greater than the third preset wind resistance value f3Determining that the filter screen is seriously filthy-blocked; if the current wind resistance value f is less than or equal to the third preset wind resistance value f3Determining that the filter screen is completely dirty and blocked, wherein a second preset wind resistance value f2Is less than the first preset wind resistance value f1And is greater than the third preset wind resistance value f3As shown in fig. 2. The storage module in the controller is further used for storing a first preset wind resistance value f1A second predetermined wind resistance value f2And a third predetermined wind resistance value f3. The smaller the wind resistance value is, the more serious the filth blockage degree of the filter screen at the air inlet of the air treatment equipment is, and the filth blockage degree of the filter screen is divided into three filth blockage grades of light filth blockage, heavy filth blockage and complete filth blockage, so that the air treatment equipment can be usedThe degree of filth blockage of the filter screen can be clearly known by a user on the basis of determining the filth blockage of the filter screen.
Of course, the filth blockage degree of the filter screen can also be divided into four grades, for example, light filth blockage, medium filth blockage, heavy filth blockage and complete filth blockage, and at this time, the range of the wind resistance value between the wind resistance value corresponding to the light filth blockage of the filter screen and the wind resistance value corresponding to the complete filth blockage of the filter screen only needs to be divided into four parts. The grade division of the filth blockage degree of the filter screen is specifically divided into a plurality of filth blockage grades, and no specific limitation is imposed on the grade division.
Further, according to the method for detecting filth blockage of the filter screen, an air deflector is arranged at an air outlet of the air treatment device, and before comparing the current wind resistance value with the preset wind resistance value, the method further includes: pre-establishing a first relation corresponding table between the filth blockage degree of the filter screen and a preset wind resistance value when the fan is at a preset rotating speed and the air deflector is in a static state; a second relation corresponding table between the filth blockage degree of the filter screen and the preset wind resistance value is established in advance when the fan is at the preset rotating speed and the air deflector is in a swing state; acquiring the rotating speed of a fan; judging whether the air deflector is in a static state or in a swinging state, and if the air deflector is in the static state, searching a corresponding preset wind resistance value in a first relation corresponding table according to the current rotating speed of the fan; if the air deflector is in a swinging state, the corresponding preset wind resistance value is searched in the second relation corresponding table according to the current rotating speed of the fan. The storage module in the controller is further used for storing the first relation table and the second relation table.
The controller obtains the rotating speed of the fan, then obtains the current state of the air deflector, and knows whether the current air deflector is in a static state or in a swinging state, wherein the static state of the air deflector refers to the initial position of the air deflector after the air conditioner is started, and can also be the position of the air deflector when a user manually adjusts the air deflector to any position. The swing state is the state of the air deflector when the user realizes the up-and-down swing or the left-and-right swing of the air deflector through the air swing function key on the air conditioner remote controller. The remote controller sends out a wind swinging instruction, and the controller indicates that the current air deflector is in a swinging state after receiving the wind swinging instruction; on the contrary, if the controller does not receive the air swinging instruction during the filth blockage detection of the filter screen, the current air deflector is in a static state.
Optionally, the air processing device further includes a position sensor, the position sensor is mounted on the air deflector and connected to the controller, and is used for detecting a current state of the air deflector, the position sensor sends detected position information of the air deflector to the controller, and the controller determines whether to search a wind resistance value corresponding to the rotation speed in the first relation table or the second relation table according to the position information, so as to quickly know a current filth blockage condition of the filter screen.
It should be noted that: because the air deflector is in a static state and a swinging state to influence the air output of the air conditioner, in order to more clearly and accurately know the current filth blockage condition of the filter screen, the invention establishes a first relation corresponding table when the air deflector is in the static state and a second relation corresponding table when the air deflector is in the swinging state in advance.
In the motor control design stage, a first relation corresponding table between the filth blockage degree of the filter screen and the preset wind resistance value is obtained through a touch test when the fan is at a preset rotating speed and the air deflector is in a static state, and is shown in table 1.
TABLE 1 first relationship correspondence table
In the motor control design stage, a second relation corresponding table between the filth blockage degree of the filter screen and the preset wind resistance value is obtained through a touch test when the fan is at the preset rotating speed and the air deflector is in a swing state, as shown in table 2.
TABLE 2 second relationship correspondence table
It should be noted that: in order to increase the first predetermined wind resistance value f1A second predetermined wind resistance value f2And a third predetermined wind resistance value f3The accuracy of the method ensures that the filth blockage detection precision of the filter screen is higher, and the first preset wind resistance value f in the method is1A second predetermined wind resistance value f2And a third predetermined wind resistance value f3All are mean values obtained after multiple tests.
The value range of the rotating speed of the fan is 350-1000 rpm, and the value range is determined according to the specific configuration of the air conditioner. The value of the rotating speed n can be a preset rotating speed value or a preset rotating speed range, and similarly, the first preset wind resistance value f1A second predetermined wind resistance value f2And a third predetermined wind resistance value f3The wind resistance value can be preset, and the wind resistance threshold value can also be preset. For example, if the air deflector is in a static state and the rotation speed of the fan is n1～n2In between, the first preset wind resistance threshold is f11～f21If the air deflector is in a swinging state and the rotating speed of the fan is n1～n2If the first preset wind resistance threshold value is f'11～f'21。
Based on the embodiment, if the wind shield is in the static state and the rotating speed of the fan is n according to the judgment1～n2Judging that the current wind resistance value is between the first preset wind resistance threshold value, and indicating that the filter screen is slightly dirty and blocked; and judging that the current wind resistance value exceeds the threshold range of the first preset wind resistance threshold value, and indicating that the filter screen is not lightly dirty and blocked.
Further, the method for detecting filth blockage of the filter screen further comprises a processing step after the detecting step, wherein the processing step specifically comprises: if the filter screen is in a mild filth blockage state or a severe filth blockage state, controlling to send prompt information to remind a user to clean the filter screen; and if the filter screen is judged to be in a complete dirty and blocked state, the control module sends out prompt information and controls the air treatment equipment to enter a shutdown protection mode. If the filter screen is in a light filth blockage state or a severe filth blockage state, the refrigerating or heating effect of the air conditioner is deteriorated, but the air conditioner can normally operate, prompt information is sent by control, a user only needs to be reminded that the filter screen needs to be cleaned, and the user selects whether to clean the filter screen. If the filter screen is judged to be in a complete dirty and blocked state, the control unit sends prompt information and controls the air treatment equipment to enter a shutdown protection mode, so that the temperature of the heat exchanger is prevented from being continuously reduced in a refrigeration mode of the air conditioner; in the heating mode, the temperature of the heat exchanger is continuously increased, so that the damage to the heat exchanger and other devices in the air conditioner caused by the continuous decrease or increase of the temperature can be avoided.
Further, if judge and obtain that the filter screen is in mild filth stifled state, then control sends tip information, reminds the user to wash the filter screen, specifically includes: if the filter screen is in a mild filth blockage state, displaying mild filth blockage prompt information; if the filter screen is in the severe filth blockage state through judgment, severe filth blockage prompt information is displayed, the mild filth blockage prompt information or the severe filth blockage prompt information is displayed through a display screen of the air conditioner indoor unit, a user is reminded of cleaning the air conditioner filter screen in time, the current wind resistance value is improved, so that the wind resistance caused by filth blockage of the filter screen is increased, the refrigerating or heating effect of the air conditioner is improved, the reduction of the energy consumption of air treatment equipment due to idling of a fan is avoided, bacteria can be prevented from breeding on the filter screen, and the air quality in a room and the use comfort of the air conditioner are improved.
Based on the embodiment, when the filter screen is slightly filthy blocked, the controller controls and displays the prompt information of the slight filthy blockage, and the display screen of the indoor unit of the air conditioner displays the characters of the slight filthy blockage or C; when the filter screen is severely blocked, the controller controls and displays severe filth blockage prompt information, and characters of severe filth blockage or CC are displayed on a display screen of the indoor unit of the air conditioner; when the filter screen is completely dirty and blocked, the controller controls and displays complete dirty and blocking prompt information, characters of 'complete dirty and blocking' or 'CCC' are displayed on a display screen of the indoor unit of the air conditioner, and the indoor unit enters a shutdown protection mode. And the storage module in the controller is also used for storing the display character patterns, and when the controller judges the filthy blockage degree of the filter screen, the display character patterns corresponding to the detected filthy blockage degree of the filter screen are searched in the storage module. Of course, other prompt messages may also be displayed, and the specific display content of the prompt message is not particularly limited in the present invention.
Optionally, if judge and obtain that the filter screen is in mild filth stifled state, then control sends tip information, reminds the user to wash the filter screen, specifically includes: if the filter screen is in a mild filth blockage state, sending mild filth blockage prompt information; if the filter screen is judged to be in the severe filth blockage state, severe filth blockage prompt information is sent, the air treatment equipment further comprises a buzzer, the buzzer is electrically connected with the controller, the controller sends a control instruction corresponding to the mild filth blockage prompt information or the severe filth blockage prompt information, and the buzzer sends corresponding sound prompt after receiving the control instruction, so that a user can be reminded of the filth blockage condition of the filter screen more simply and conveniently.
Similarly, when the filter screen is slightly blocked, the controller controls the buzzer to send out a slight blockage prompt message, wherein the slight blockage prompt message is 'dripping, dripping … … dripping'; when the filter screen is severely blocked, the controller controls the buzzer to send out severe filth blockage prompting information, wherein the severe filth blockage prompting information is 'dripping, dripping … … dripping'; when the filter screen is in complete filth blockage, the controller controls the buzzer to send out complete filth blockage prompt information, wherein the complete filth blockage prompt information is 'dripping and … … dripping', and the filter screen enters a shutdown protection mode. And the storage module in the controller is also used for storing the ringing prompt sound, and when the controller judges that the filth blockage degree of the filter screen is obtained, the ringing prompt sound corresponding to the detected filth blockage degree of the filter screen is searched in the storage module. Of course, other sounding prompt sounds may be displayed, and the sound content of the sounding prompt sounds is not particularly limited in the present invention.
Of course, the prompt information may also remind the user in the form of an indicator light, or may be a combination of any two or three of the above prompt modes.
Referring to fig. 3, if it is determined that the filter screen is in a mild filth blockage state, a mild filth blockage prompt message is displayed, which specifically includes: if the filter screen is in a slight filth blockage state, recording the accumulated times i of the filter screen in the slight filth blockage state; if the accumulated time i is less than or equal to the preset accumulated time i', displaying mild visceral obstruction prompt information, and controlling to return to the detection step; and if the accumulated time i is greater than the preset accumulated time i', controlling to return to the detection step. The storage module in the controller is further configured to pre-store a preset accumulated number i'. The air treatment equipment further comprises a counter which is electrically connected with the controller, the counter is used for recording the accumulated times of slight filth blockage of the filter screen, and the user can be reminded only when the accumulated times are smaller than the preset times, so that the problem that the user experiences poor use experience due to multiple reminding can be avoided. The preset accumulated times can be 1 time, 2 times, 3 times and the like.
Referring to fig. 3 and 4, the method for detecting filth blockage of the filter screen further includes: if the filter screen is judged to be in the light filthy blockage state, displaying light filthy blockage prompt information and recording first running time t 'of the air treatment equipment'1When the first operation time t'1Is greater than or equal to a first preset running time T'1If so, controlling to return to the detection step; if the filter screen is judged to be in the severe filth blockage state, displaying severe filth blockage prompt information and recording second running time t 'of the air treatment equipment'2When the second operation time t'2Is greater than or equal to a second preset running time T'2Then, control returns to the detecting step, wherein the first preset running time T'1Greater than second preset running time T'2. The controller further comprises a timing module for recording the running time of the air conditioner, and the storage module in the controller is further used for storing a first preset running time T'1And a second preset run time T'2. When the filter screen is slightly dirty and blocked, the detection period is longer than that when the filter screen is severely dirty and blocked, and the process of accumulating time is used for the dirty and blocked of the air conditioner filter screen, so that the frequent dirty and blocked degree of the filter screen by the air treatment equipment can be avoided when the filter screen is slightly dirty and blocked, and the reduction of the energy consumption of the air treatment equipment is not facilitated. When the filter screen of the air conditioner is seriously clogged with filth, the filth is already blockedThe refrigeration or heating effect of the air treatment equipment is seriously influenced, the detection period is set to be shorter, the situations of filter screen filth blockage, missing detection and missing report of the air treatment equipment can be avoided when the filter screen is completely filth blocked, and therefore the reliability of filth blockage detection of the air conditioner filter screen is improved.
It should be noted that: the first preset running time T'1The value range of (1) is 30-60 min, namely every other first preset operation time T 'when the filter screen is slightly filthy blocked'1Detecting the filth blockage condition of the primary filter screen, wherein the second preset running time is T'2The value range of (1) is 5min to 30min, namely every second preset operation time T 'when the filter screen is seriously blocked'1And detecting the filth blockage condition of the primary filter screen. When the air conditioner is used in a dirty environment, the first preset operation time T 'can be set'1And a second preset run time T'2Corresponding time reduction, e.g. first preset run time T'1The value range of (a) is 10min to 30min, and the second preset running time T'2The value range of (A) is 5-10 min. Invention aims at the first preset running time T'1And a second preset run time T'2The value range of (A) is not specifically limited as long as the first preset operation time T 'is ensured'1Greater than second preset running time T'2And (4) finishing.
Optionally, the method for detecting filth blockage of the filter screen further includes: if the filter screen is judged to be in the light filthy blockage state, displaying light filthy blockage prompt information and recording first running time t 'of the air treatment equipment'1When the first operation time t'1Is greater than or equal to a first preset running time T'1If so, controlling to return to the detection step; if the filter screen is judged to be in the severe filth blockage state, displaying severe filth blockage prompt information and recording second running time t 'of the air treatment equipment'2When the second operation time t'2Is greater than or equal to a second preset running time T'2Then, control returns to the detecting step, wherein the first preset running time T'1Is equal to a second preset running time T'2So that the control process of the air treatment equipment is simple and convenient。
Further, the method for detecting filth blockage of a filter screen, after the prompt information of mild filth blockage is displayed if the filter screen is judged to be in the mild filth blockage state, further includes: first reminding time t for recording mild filth blockage prompt information1When the first reminding time t1Is equal to or more than a first preset reminding time T1And when the patient is in the normal state, the control quits displaying the mild visceral obstruction prompt information. The controller also comprises a timing module for recording the first reminding time t1First reminding time t1The storage module in the controller is also used for storing first preset reminding time T for reminding the filter screen of the prompt message of slight filth blockage1. The method sets the first reminding time t1And a first preset reminding time T1The display time of the mild visceral obstruction prompt information can be controlled, so that the condition that the prompt time is too short and a user cannot easily find the prompt time is avoided; meanwhile, the phenomenon that the prompting time is too long and more electric energy is consumed can be avoided.
Based on the embodiment, after the user is prompted if the filter screen is judged to be in the light filth blockage state, if the user cleans the filter screen, the controller controls the accumulated times recorded by the counter to be cleared, and the detection step is directly returned; or, if the user does not clean the filter screen, the controller also controls the accumulated times recorded by the counter to be cleared when the controller judges that the filth blockage state of the filter screen changes.
In addition, the first reminding time t of the mild filth blockage prompt information is recorded1Then, the first reminding time t is compared1And a first preset reminding time T1Before, further comprising: judging whether the filter screen is cleaned or not, and comparing the first reminding time t if the filter screen is not cleaned1And a first preset reminding time T1If the filter screen is judged to be cleaned completely, the detection step is returned.
Further, the method for detecting filth blockage of a filter screen, after the prompt information of severe filth blockage is displayed if the filter screen is judged to be in a severe filth blockage state, further comprises: record Severe dirtiesSecond reminding time t of blocking prompt message2When the second reminding time t2Is equal to or more than the second preset reminding time T2When the time is up, the control quits displaying the prompt information of severe filth blockage, wherein the first preset reminding time T1Is less than the second preset reminding time T2. The controller also comprises a timing module for recording the second reminding time t2Second reminding time t2The storage module in the controller is also used for storing a second preset reminding time T for reminding the prompt time of the prompt information of the severe filth blockage of the filter screen2. When the filter screen is severely blocked, the filth blockage degree of the filter screen is relatively serious, so that the prompt time of the prompt information of the severe filth blockage is longer, the attention of a user is aroused, and the user is informed that the filter screen needs to be cleaned immediately. Exemplarily, the first preset reminding time T is1The value range of (1) is 30s to 120s, and the second preset reminding time T2The value range of (A) is 2 min-5 min.
Similarly, the second reminding time t of the prompt message of severe filth blockage is recorded2Then, the second reminding time t is compared2And a second preset reminding time T2Before, further comprising: judging whether the filter screen is cleaned or not, and comparing the second reminding time t if the filter screen is not cleaned2And a second preset reminding time T2If the filter screen is judged to be cleaned completely, the detection step is returned.
Further, after the control of sending out the prompt message and controlling the air processing equipment to enter the shutdown protection mode, the method for detecting the filth blockage of the filter screen further comprises the following steps: and controlling the cleaning assembly to clean the filter screen, controlling the air treatment equipment to restart after the cleaning assembly stops cleaning, and releasing shutdown protection. After the cleaning component cleans the filter screen, a corresponding action instruction is sent, the controller indicates that the cleaning component has finished cleaning after receiving the instruction, the controller controls the air treatment equipment to restart, the shutdown protection is removed, and the air treatment equipment operates normally.
Optionally, after the control of sending the prompt message and controlling the air processing device to enter the shutdown protection mode, the method for detecting dirty blocking of the filter screen further includes: the control trigger device sends a work instruction for finishing cleaning, and the controller controls the air treatment equipment to restart and remove shutdown protection after receiving the instruction.
The air treatment equipment also comprises a trigger device, and the trigger device is electrically connected with the controller. The scheme that the cleaning assembly is not included in the air treatment equipment is that a user detaches and cleans the filter screen, after the cleaned air conditioner filter screen is installed, the trigger device can be manually triggered, a corresponding action instruction can be input through a function key on an air conditioner remote controller, after the controller receives the action instruction, the trigger device is controlled to trigger and send a work instruction for cleaning, after the controller receives the work instruction for cleaning, the cleaning assembly is indicated to be cleaned, the controller controls the air treatment equipment to be restarted, shutdown protection is removed, and the air treatment equipment runs normally.
Further, the embodiment of the invention provides air treatment equipment, wherein a filter screen is arranged at an air inlet of the air treatment equipment, and the air treatment equipment adopts the filter screen filth blockage detection method. Wherein, the air treatment equipment can be an air conditioner, an air purifier, a dehumidifier and the like.
It should be noted that: when the air treatment equipment is an air conditioner, the air conditioner comprises an indoor unit of the air conditioner, a filter screen is installed at an air inlet of the indoor unit of the air conditioner, the filter screen filth blockage detection method is used for detecting filth blockage of the filter screen at the air inlet of the indoor unit of the air conditioner, at the moment, the filter screen filth blockage detection method is applied to the indoor unit of the air conditioner, and the filter screen filth blockage detection method comprises the following steps: a detection step, wherein the detection step comprises: calculating to obtain actual load torque according to a load torque observer of a motor in the indoor fan; calculating to obtain a current wind resistance value according to the actual load torque; and comparing the current wind resistance value with a preset wind resistance value, and if the current wind resistance value is less than or equal to the preset wind resistance value, determining that dirty blockage occurs in the filter screen.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A filter screen filth blockage detection method is characterized by being applied to air treatment equipment and comprising the following steps: a detection step, comprising:
calculating to obtain actual load torque according to a load torque observer of a motor in the fan;
calculating to obtain a current wind resistance value according to the actual load torque;
and comparing the current wind resistance value with a preset wind resistance value, and if the current wind resistance value is less than or equal to the preset wind resistance value, determining that dirty blockage occurs in the filter screen.
2. The method for detecting dirty plugging of a filter screen according to claim 1, wherein if the current wind resistance value is less than or equal to the preset wind resistance value, it is determined that the filter screen is dirty, and specifically the method comprises:
if the current wind resistance value is smaller than or equal to a first preset wind resistance value and larger than a second preset wind resistance value, determining that the filter screen is lightly dirty and blocked;
if the current wind resistance value is smaller than or equal to a second preset wind resistance value and larger than a third preset wind resistance value, determining that the filter screen is heavily filthy-blocked;
and if the current wind resistance value is smaller than or equal to a third preset wind resistance value, determining that the filter screen is completely dirty and blocked, wherein the second preset wind resistance value is smaller than the first preset wind resistance value and larger than the third preset wind resistance value.
3. The method for detecting filth blockage of a filter screen according to claim 1, wherein an air deflector is arranged at an air outlet of the air treatment equipment, and before comparing the current wind resistance value with a preset wind resistance value, the method further comprises:
pre-establishing a first relation corresponding table between the filth blockage degree of the filter screen and the preset wind resistance value when the fan is at a preset rotating speed and the air deflector is in a static state;
pre-establishing a second relation corresponding table between the filth blockage degree of the filter screen and the preset wind resistance value when the fan is at a preset rotating speed and the air deflector is in a swing state;
acquiring the rotating speed of the fan;
judging whether the air deflector is in a static state or in a swinging state, and if the air deflector is in the static state, searching the corresponding preset wind resistance value in the first relation corresponding table according to the current rotating speed of the fan;
and if the air deflector is in a swinging state, searching the corresponding preset wind resistance value in the second relation corresponding table according to the current rotating speed of the fan.
4. The filter screen filth blockage detection method according to claim 1, further comprising a processing step after the detection step, wherein the processing step specifically comprises:
if the filter screen is in a light filth blockage state or a severe filth blockage state, controlling to send prompt information to remind a user to clean the filter screen;
and if the filter screen is judged to be in a complete dirty and blocked state, sending prompt information and controlling the air treatment equipment to enter a shutdown protection mode.
5. The filter screen filth blockage detection method according to claim 4, wherein if the filter screen is in a mild filth blockage state, a prompt message is controlled to be sent out to remind a user to clean the filter screen, and the method specifically comprises the following steps:
if the filter screen is in a slight filth blockage state, displaying a slight filth blockage prompt message;
and if the filter screen is in the severe filthy blockage state, displaying prompt information of the severe filthy blockage.
6. The method for detecting filth blockage of the filter screen according to claim 5, wherein if the filter screen is in a mild filth blockage state, mild filth blockage prompt information is displayed, and the method specifically comprises the following steps:
if the filter screen is in a slight filth blockage state, recording the accumulated times of the filter screen in the slight filth blockage state;
if the accumulated times are less than or equal to the preset accumulated times, displaying mild visceral obstruction prompt information, and controlling to return to the detection step;
and if the accumulated times are greater than the preset accumulated times, controlling to return to the detection step.
7. The filter screen filth blockage detection method according to claim 5, further comprising:
if the filter screen is judged to be in a slight filth blockage state, displaying slight filth blockage prompt information, recording first running time of the air treatment equipment, and returning control to the detection step when the first running time is greater than or equal to first preset running time;
and if the filter screen is in the severe filth blockage state, displaying severe filth blockage prompt information, recording second running time of the air treatment equipment, and returning to the detection step when the second running time is greater than or equal to second preset running time, wherein the first preset running time is greater than the second preset running time.
8. The method for detecting filth blockage of a filter screen according to claim 5, wherein after the step of displaying the mild filth blockage prompt message if the filter screen is judged to be in the mild filth blockage state, the method further comprises the following steps:
recording first reminding time of the mild visceral congestion prompting information, and controlling to quit displaying the mild visceral congestion prompting information when the first reminding time is equal to or more than first preset reminding time.
9. The method for detecting filth blockage of a filter screen according to claim 8, wherein after the step of displaying a severe filth blockage prompt message if the filter screen is determined to be in a severe filth blockage state, the method further comprises the following steps:
recording second reminding time of the severe visceral congestion prompting information, and controlling to quit displaying the severe visceral congestion prompting information when the second reminding time is equal to or greater than second preset reminding time, wherein the first preset reminding time is less than the second preset reminding time.
10. The filter screen fouling detection method of claim 4, wherein after the controlling sending a prompt message and controlling the air treatment equipment to enter the shutdown protection mode, the method further comprises:
and controlling a cleaning assembly to clean the filter screen, controlling the air treatment equipment to restart after the cleaning assembly stops cleaning, and releasing the shutdown protection.
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