WO2021057469A1

WO2021057469A1 - Method for determining clogging degree of dust filter screen of air conditioner, and air conditioner

Info

Publication number: WO2021057469A1
Application number: PCT/CN2020/114074
Authority: WO
Inventors: 陈建龙; 张飞; 陆建松; 鞠龙家; 宋威; 李淑云; 姚永祥
Original assignee: 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2019-09-26
Filing date: 2020-09-08
Publication date: 2021-04-01
Also published as: CN110749035A; CN110749035B

Abstract

A method for determining the clogging degree of a dust filter screen of an air conditioner. The method comprises: acquiring an operating mode of an air conditioner; acquiring an initial current value, corresponding to the operating mode, of an electric motor of an indoor fan of an indoor unit of the air conditioner, wherein the initial current value is an electric motor current value acquired after the air conditioner is adjusted to the operating mode during an initialization process; acquiring the current of the electric motor several times, so as to obtain a plurality of actually-measured current values; and according to the magnitudes of the plurality of actually-measured current values and the initial current value, determining the clogging degree of a dust filter screen. According to the air conditioner and the method for determining the clogging degree of a dust filter screen of the air conditioner of the present invention, the precision rate for determining the clogging degree of the dust filter screen is improved, and incorrect determination is reduced, thereby improving the user experience.

Description

Method for judging clogging degree of dust filter of air conditioner and air conditioner

Technical field

The present invention relates to the technical field of air conditioning, in particular to a method for determining the degree of clogging of a dust filter of an air conditioner and an air conditioner.

Background technique

The air inlet of the indoor unit of the existing air conditioner is provided with a dust filter to filter the air entering the indoor unit and prevent debris such as dust from entering the indoor unit. After long-term use, dust and other debris will easily adhere to the dust filter, which will block the mesh of the dust filter. If cleaning is not carried out in time, it will not only reduce the amount of air entering the indoor heat exchanger, affect the cooling and heating effect of the air conditioner, but also increase the energy consumption of the air conditioner and shorten the service life of the air conditioner. Most of the existing air conditioners use the user to roughly estimate the use time of the air conditioner to clean the dust filter, which brings unnecessary extra burden to the user, and it is very likely that the dust filter is clogged and cannot be handled. Although some air conditioners have a reminder function, they only rely on the use time of the air conditioner to remind the blockage, and it is impossible to accurately judge the degree of blockage of the dust filter.

Summary of the invention

An object of the present invention is to provide a method for determining the degree of clogging of a dust filter of an air conditioner with high accuracy.

Another further object of the present invention is to provide an air conditioner capable of determining the degree of clogging of the dust filter.

In particular, the present invention provides a method for determining the degree of clogging of a dust filter of an air conditioner, including:

Obtain the operating mode of the air conditioner;

Acquiring the initial current value of the motor of the indoor fan of the indoor unit of the air conditioner corresponding to the operating mode, where the initial current value is the motor current value obtained after the air conditioner is adjusted to the operating mode during the initialization process;

Obtain the current of the motor multiple times and obtain multiple measured current values;

Determine the degree of clogging of the dust filter based on the magnitude of multiple measured current values and the initial current value.

Optionally, the step of acquiring the measured current value includes: acquiring the current of the motor every time the air conditioner is turned on and running in the operating mode to obtain a measured current value.

Optionally, the step of judging the degree of clogging of the dust filter according to the magnitude of a plurality of actual measured current values and the initial current value includes:

Calculate the difference between the initial current value and the preset current judgment difference to obtain the current judgment threshold;

Determine the degree of clogging of the dust filter based on multiple measured current values and the size of the current determination threshold.

Optionally, the step of judging the degree of clogging of the dust filter according to the magnitude of a plurality of actual measured current values and the current judgment threshold value includes:

Determine whether multiple measured current values are all lower than the current determination threshold;

When multiple measured current values are lower than the current judgment threshold, judge whether the cumulative operating time of the air conditioner is greater than the operating time judgment threshold;

When the accumulated running time is greater than the running time judging threshold, it is judged that the dust filter is in a clogged state.

Determine whether multiple measured current values are greater than or equal to the initial current value;

When multiple measured current values are greater than or equal to the initial current value, it is determined that the dust filter is in a clean state.

Optionally, the preset current determination difference is determined according to the indoor humidity value of the indoor environment where the indoor unit is located.

Optionally, determining the preset current determination difference according to the indoor humidity value of the indoor environment where the indoor unit is located includes the steps:

Obtain the current compensation value corresponding to the indoor humidity value;

Calculate the sum of the reference setting value and the current compensation value to obtain the preset current judgment difference.

Optionally, the indoor humidity value is obtained by a humidity sensor arranged outside the indoor unit; and/or

The indoor humidity value is calculated by the following formula:

Rh=(a×freq+c-ΔT′)/b,

ΔT′={ΔT×[1-g×(Troom-27)]+d×(Toutdoor-35)}×e+f,

ΔT=Troom-Tincoil,

In the formula, Rh is the indoor humidity value, freq is the operating frequency of the compressor of the outdoor unit of the air conditioner, Troom is the indoor ambient temperature where the indoor unit is located, Toutdoor is the outdoor ambient temperature where the outdoor unit is located, and Tincoil is the indoor unit's temperature. The coil temperature of the heat exchanger, a is the compressor frequency correction constant, b is the indoor humidity correction constant, c is the indoor unit coil temperature correction constant, d is the outdoor ambient temperature correction constant, e is the indoor fan wind speed correction constant, f Is the correction constant of outdoor fan wind speed, and g is the correction constant of indoor ambient temperature.

The invention also discloses an air conditioner, including:

The indoor unit has an indoor fan, and a dust filter is installed at the air inlet of the indoor unit; and

The controller has a memory and a processor, and a control program is stored in the memory. When the control program is executed by the processor, it is used to realize the aforementioned method for determining the degree of clogging of the dust filter of the air conditioner.

Optionally, the controller is further configured to send a cleaning signal when it is determined that the dust filter is in a clogged state, and clear the accumulated operating time of the air conditioner.

The method for determining the degree of clogging of the air conditioner and the air conditioner dust filter of the present invention proposes that the motor current value obtained after the air conditioner is adjusted to the operating mode during the initialization process is used as the initial current value of the operating mode, and multiple measured current values are used. Determine the degree of clogging of the dust filter with the size of the initial current value, which can avoid the misjudgment of the clogging of the dust filter caused by the installation position of the indoor unit too close to the ceiling of the indoor roof.

Further, the method for determining the degree of clogging of the air conditioner dust filter of the present invention first determines whether the obtained multiple measured current values are all lower than the current judging threshold, and when the multiple measured current values are all lower than the current judging threshold, then judge Whether the cumulative operating time of the air conditioner is greater than the operating time threshold, when the cumulative operating time is greater than the operating time threshold, it is determined that the dust filter is clogged, which improves the accuracy of determining the degree of clogging of the dust filter, reduces misjudgments, and improves user experience.

Further, in the method for determining the degree of clogging of a dust filter of an air conditioner of the present invention, the preset current determination difference is determined according to the indoor humidity value of the indoor environment where the indoor unit is located, which can avoid the occurrence of condensation due to high environmental humidity. Water covers the surface of the indoor heat exchanger and causes the air duct to be blocked, which is a misjudgment similar to the blockage of the dust filter.

Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will better understand the above and other objectives, advantages and features of the present invention.

Description of the drawings

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic side view of an indoor unit of an air conditioner according to an embodiment of the present invention.

Fig. 2 is a schematic flowchart of a method for determining the degree of clogging of a dust filter of the air conditioner shown in Fig. 1.

Fig. 3 is a schematic diagram of the composition of an air conditioner according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of the composition of an air conditioner according to another embodiment of the present invention.

Fig. 5 is a schematic flowchart of a control method of an air conditioner according to an embodiment of the present invention.

Fig. 6 is a schematic flowchart of a method for determining the degree of clogging of a dust filter of an air conditioner according to an embodiment of the present invention.

detailed description

Fig. 1 is a schematic side view of an indoor unit 100 of an air conditioner 300 according to an embodiment of the present invention. 2 is a schematic flowchart of a method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 shown in FIG. 1. Fig. 3 is a schematic diagram of the composition of an air conditioner 300 according to an embodiment of the present invention.

The embodiment of the present invention will take the air conditioner 300 with the wall-mounted indoor unit 100 as an example, and describe the composition of the air conditioner 300 and the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 in detail. The air conditioner 300 of the embodiment of the present invention generally includes: an indoor unit 100 and an outdoor unit 200. The indoor unit 100 includes a housing 110, an air inlet 101, an air outlet 102, an air guide plate 140, an indoor heat exchanger 120, an indoor fan 130 and a dust filter 103. An air inlet 101 is opened on the top of the housing 110, and a dust filter 103 is provided at the air inlet 101. An air outlet 102 is provided at the lower part of the front side of the housing 110. The air outlet 102 opens forward and downward. The housing 110 may be a long strip structure extending in a transverse direction, and the air outlet 102 is a strip opening extending in a transverse direction. An air deflector 140 is provided at the air outlet 102. The indoor heat exchanger 120 and the indoor fan 130 are arranged in the housing 110. The indoor heat exchanger 120 is used to exchange heat with the air entering the housing 110 from the air inlet 101 to form heat exchange air. Specifically, cold air is used for cooling, and hot air is used for heating. The indoor fan 130 is preferably a cross-flow fan with an axial direction extending in a transverse direction, which is used to encourage air to flow from the indoor heat exchanger 120 to the air outlet 102, and then blow into the room. The indoor fan 130 has a motor 131. The outdoor unit 200 includes a casing, and a compressor 210, an outdoor heat exchanger 220, and an outdoor fan 230 disposed inside the casing. The indoor unit 100 and the outdoor unit 200 together constitute a compression refrigeration cycle system, so as to realize cooling or heating of the indoor environment. The compression refrigeration cycle system utilizes the compression phase change cycle of the refrigerant in the compressor 210, the outdoor heat exchanger 220, the indoor heat exchanger 120, and the throttling device to realize heat transfer.

The method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention includes the steps:

S202: Obtain the operating mode of the air conditioner 300;

S204: Obtain the initial current value of the motor 131 of the indoor fan 130 of the indoor unit 100 of the air conditioner 300 corresponding to the operating mode, where the initial current value is the motor current value obtained after the air conditioner 300 is adjusted to the operating mode during the initialization process;

S206: Obtain the current of the motor 131 multiple times to obtain multiple measured current values;

S208: Determine the degree of clogging of the dust filter 103 according to the magnitude of the multiple measured current values and the initial current value.

In step S204, the motor current value obtained after the air conditioner is adjusted to the operating mode during the initialization process is used as the initial current value of the operating mode, which means that after the air conditioner 300 is installed in the user's use environment, when the air conditioner 300 is powered on for the first time, the control The air conditioner 300 enters different operation modes. In each operation mode, the current of the motor 131 is obtained multiple times, and the average value is taken to obtain the initial current value corresponding to the operation mode. Here, when determining the initial current value, the number of times of obtaining the current of the motor 131 multiple times is preferably 3-5 times. The value range of the initial current value is generally 20mA-30mA. The operation mode of the air conditioner 300 generally includes a heating mode, a cooling mode, and an air supply mode. That is to say, the heating mode of the air conditioner 300 of the embodiment of the present invention has a corresponding initial heating current value, the cooling mode has a corresponding initial cooling current value, and the air supply mode has a corresponding initial air supply current value.

In step S206, the number of times of obtaining the actual measured current value multiple times is preferably 5-10 times. The multiple acquisitions of the measured current value are not the same as the multiple acquisitions of the initial current value. In some embodiments, the actual measured current value is that each time the air conditioner 300 is turned on and runs in the operating mode, the current of the motor 131 is obtained to obtain one actual measured current value; after several consecutive recordings, multiple actual measured current values are obtained. That is to say, each time the air conditioner 300 is turned on, it obtains a measured current value, and it is turned on several times to obtain several measured current values, instead of obtaining multiple measured current values in one turn-on. In some embodiments, the acquisition time of the measured current value is the set time after the air conditioner is turned on and operated in the operating mode. For example, when entering the operating mode for 5 minutes, or entering the operating mode for 1 minute, or entering the operating mode for 30 seconds. It can be understood that, in the determination method of the embodiment of the present invention, step S202 and step S204 may be executed first and then step S206 may be executed, and step S206 may also be executed first and then step S202 and step S204 may be executed.

In the existing air conditioner 300, the initial current value of the motor 131 of the indoor fan 130 in different operation modes is set to a fixed value set at the factory. This causes that when the indoor unit 100 is installed too close to the ceiling of the indoor roof where it is located, an effect similar to the clogging of the dust filter 103 will be formed. The inventor of the present invention proposes to set the initial current value to the motor current value obtained after the air conditioner 300 is adjusted to the operating mode during the initialization process, and then consider multiple measured current values and the size of the initial current value to determine the dust filter The degree of blockage of 103 can avoid the misjudgment of blockage of the dust filter 103 caused by the installation position of the indoor unit 100 being too close to the ceiling of the indoor roof.

The air conditioner 300 in the embodiment of the present invention further includes a controller 400. The controller 400 has a memory 401 and a processor 402. A control program 410 is stored in the memory 401. When the control program 410 is executed by the processor 402, it is used to implement the aforementioned method for determining the degree of clogging of the dust filter 103 of the air conditioner 300. The controller 400 is generally installed in the indoor unit 100.

In some embodiments, in the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention, the step of determining the degree of clogging of the dust filter 103 according to a plurality of measured current values and initial current values includes:

The degree of clogging of the dust filter 103 is determined based on the magnitude of the plurality of actual measured current values and the current determination threshold value.

In some embodiments, in the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention, the step of determining the degree of clogging of the dust filter 103 according to a plurality of actual measured current values and current determination thresholds includes:

When multiple measured current values are all lower than the current determination threshold value, it is determined whether the accumulated operating time of the air conditioner 300 is greater than the operating time determination threshold value;

When the accumulated operating time is greater than the operating time determination threshold, it is determined that the dust filter 103 is in a clogged state.

In order to improve the accuracy of determining the degree of clogging of the dust filter 103, the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 of the embodiment of the present invention first determines whether a plurality of continuously obtained measured current values are all lower than the current determination threshold; When multiple measured current values are lower than the current determination threshold, it is determined whether the cumulative operating time of the air conditioner 300 is greater than the operating time determining threshold; when the cumulative operating time is greater than the operating time determining threshold, it is determined that the dust filter 103 is in a blocked state. In this judgment method, multiple measured current values are compared with the current judgment threshold value, which can make the judgment result closer to the actual; it also considers whether the cumulative running time is greater than the running time judgment threshold value. Through a series of multi-step limitation, it can fully reduce the occurrence of errors. Judgment and improve user experience. The method for acquiring the accumulated operating time may adopt the existing technology in the field of air conditioner 300, which will not be described in detail here.

In some embodiments, the preset current determination difference is determined according to the indoor humidity value of the indoor environment where the indoor unit 100 is located. When the ambient humidity is high, because the condensed water covers the surface of the indoor heat exchanger 120, the air outlet is blocked, which is similar to the dust filter 103 clogging. At this time, although the dust filter 103 is not clogged, it is due to the indoor fan 130. If the current value of the motor 131 becomes low, the controller 400 will still consider it as a blockage, causing a misjudgment. In the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention, the preset current determination difference is determined according to the indoor humidity value of the indoor environment where the indoor unit 100 is located, which can avoid the occurrence of high ambient humidity. As the condensed water covers the surface of the indoor heat exchanger 120, the air duct is clogged, which is a misjudgment similar to the clogging of the dust filter 103. Combined with the operation mode of the air conditioner 300, when the air conditioner 300 is in the heating mode, the air humidity is usually low. Therefore, the step of determining the preset current determination difference according to the indoor humidity value is especially suitable for the situation where the air conditioner 300 is in the cooling mode .

In some embodiments, determining the preset current determination difference according to the indoor humidity value of the indoor environment where the indoor unit 100 is located includes the steps:

The value range of the reference set value is 3mA-10mA, and the value range of the current compensation value is 0mA-5mA.

The indoor humidity value may be obtained by obtaining the indoor humidity value through a humidity sensor 104 provided outside the indoor unit 100; and/or

Calculated by the following formula:

Rh=(a×freq+c-ΔT′)/b,

ΔT′={ΔT×[1-g×(Troom-27)]+d×(Toutdoor-35)}×e+f,

ΔT=Troom-Tincoil,

In the formula, Rh is the indoor humidity value; freq is the operating frequency of the compressor 210 of the outdoor unit 200 of the air conditioner 300, with an accuracy of 1Hz; Troom is the indoor ambient temperature where the indoor unit 100 is located, with an accuracy of 0.1°C, and the value range is 20-35°C (below 20°C is regarded as 20°C, higher than 35°C is regarded as 35°C); Toutdoor is the outdoor ambient temperature where the outdoor unit 200 is located, with an accuracy of 0.1°C, and the value range is 20-40°C (low 20°C is regarded as 20°C, higher than 40°C is regarded as 40°C); Tincoil is the coil temperature of the indoor heat exchanger 120 of the indoor unit 100, with an accuracy of 0.2°C, and the value range is 0-30°C (below 0 ℃ is regarded as 0℃, higher than 30℃ is regarded as 30℃); a is the compressor 210 frequency correction constant, b is the indoor humidity correction constant, c is the indoor unit 100 coil temperature correction constant, and d is the outdoor ambient temperature correction constant , E is the wind speed correction constant of the indoor fan 130, f is the wind speed correction constant of the outdoor fan 230, and g is the indoor ambient temperature correction constant. The wind speed correction constant e of the indoor fan 130 and the wind speed correction constant f of the outdoor fan 230 can be set with different correction constants for different wind speed intervals.

Fig. 3 is a schematic diagram of the composition of an air conditioner 300 according to an embodiment of the present invention. In this embodiment, a humidity sensor 104 is provided outside the indoor unit 100.

Fig. 4 is a schematic diagram of the composition of an air conditioner 300 according to another embodiment of the present invention. In this embodiment, an indoor temperature sensor 105 is provided outside the indoor unit 100 to detect Troom; a coil temperature sensor 106 is provided at the indoor heat exchanger 120 of the indoor unit 100 to detect Tincoil; An outdoor temperature sensor 201 is provided outside the machine 200 to detect Toutdoor.

In the determination method of the embodiment of the present invention, the indoor humidity value can be obtained by setting the humidity sensor 104, or the indoor humidity value can be calculated by a formula. The two methods can be selected from one of the two methods, or they can complement each other.

The control method of the air conditioner 300 according to the embodiment of the present invention will be described in detail below. FIG. 5 is a schematic flowchart of a control method of the air conditioner 300 according to an embodiment of the present invention. The control method of the air conditioner 300 according to the embodiment of the present invention includes the steps:

S502: Obtain the operation mode of the air conditioner 300, and determine that the air conditioner 300 is in a heating mode, a cooling mode, or a ventilation mode;

S504: Obtain the initial current value of the motor 131 of the indoor fan 130 of the indoor unit 100 of the air conditioner 300 corresponding to the operating mode, where the initial current value is the motor current value obtained after the air conditioner 300 is adjusted to the operating mode during the initialization process. The heating mode corresponds to the initial heating current value, the cooling mode corresponds to the initial cooling current value, and the air supply mode corresponds to the initial current value of the air supply;

S506: Obtain the indoor humidity value through the humidity sensor 104 provided outside the indoor unit 100; and/or calculate the indoor humidity value through the aforementioned formula;

S508: Obtain a current compensation value corresponding to the indoor humidity value;

S510: Calculate the sum of the reference set value and the current compensation value to obtain the preset current judgment difference;

S512: Calculate the difference between the initial current value determined in step S504 and the preset current determination difference determined in step S510 to obtain a current determination threshold;

S514: Obtain the current of the motor 131 multiple times in succession: each time the air conditioner 300 is turned on and run in the operating mode, it obtains the current of the motor 131 to obtain a measured current value, and records multiple times continuously to obtain multiple measured current values;

S516: Determine whether the multiple measured current values are all lower than the current determination threshold;

S518: If the judgment result of step S516 is yes, judge whether the cumulative operating time of the air conditioner 300 is greater than the operating time judgment threshold; if the judgment result of step S516 is no, return to step S514;

S520: If the judgment result of step S518 is yes, it is judged that the dust filter 103 is in a clogged state; if the judgment result of step S518 is no, return to step S514;

S522: The controller 400 sends a cleaning signal and clears the accumulated operating time of the air conditioner 300 to zero.

Hereinafter, taking the cooling mode as an example, the control steps of the entire air conditioner 300 will be described. It should be understood that the numerical values in the following description are for reference only.

In step S502, it is determined that the air conditioner 300 is in the cooling mode.

In step S504, the initial current value corresponding to the cooling mode is 25mA (after the installation of the air conditioner 300 is completed, it is powered on for the first time to control it to enter the cooling mode, and the current of the motor 131 of the indoor fan 130 is obtained 5 times to obtain 24mA, 25mA, 25mA, 25mA, 26mA, calculate the average value, determine the initial refrigeration current value is 25mA).

In step S506, the indoor humidity value is obtained by the humidity sensor 104 provided outside the indoor unit 100, which is 32%.

In step S508, the current compensation value corresponding to the indoor humidity value is obtained according to the preset mapping relationship:

Table 1 Set current compensation value for indoor humidity range interval

室内湿度范围区间(％)Indoor humidity range (%)	电流补偿值(mA)Current compensation value (mA)
＜A＜A	Y ₁ Y ₁
A-BA-B	Y ₂ Y ₂
B-CB-C	Y ₃ Y ₃
C-DC-D	Y ₄ Y ₄
D-ED-E	Y ₅ Y ₅
＞E＞E	Y ₆ Y ₆

Table 1 shows a preset mapping relationship of the air conditioner 300. Assuming that the indoor humidity ranges from 10% to 90%, it is divided into six indoor humidity ranges, A can be 25%, B can be 30%, C can be 35%, D can be 45%, and E can be 60 %. The value range of the current compensation value Y ₁ to Y ₆ can be 0-5 mA, and the range from Y ₁ to Y ₆ increases as the indoor humidity value increases. For example, the current compensation value Y ₁ is 0 mA, the current compensation value Y ₂ is 0.5 mA, the current compensation value Y ₃ is 1.0 mA, the current compensation value Y ₄ is 2.0 mA, the current compensation value Y ₅ is 3.0 mA, and the current compensation value Y6 It is 5.0mA. In addition, it should be understood that the current compensation values corresponding to the same indoor humidity range area may be the same or different in different operating modes.

When the indoor humidity value determined in step S506 is 32%, step S208 determines that the indoor humidity value of 32% is in the BC interval, corresponding to the current compensation value Y ₃ being 1.0 mA.

In step S510, the value range of the reference set value X of the air conditioner 300 may be 3 mA-10 mA, for example, 3 mA, 5 mA, and 10 mA. Taking the reference setting value X of 5 mA as an example, calculate the sum of it and the current compensation value Y ₃ to obtain the preset current judgment difference, which is 5 mA.

In step S512, the difference between the initial current value 25 mA determined in step S504 and the preset current determination difference value 5 mA determined in step S510 is calculated to obtain the current determination threshold value, which is 20 mA.

In step S514, every time the air conditioner 300 is turned on and runs in the cooling mode, it obtains the current of the motor 131 and obtains a measured current value, which is recorded 6 times continuously to obtain 6 measured current values, which are 17mA, 17mA, 18mA, 19mA, 18mA, 19mA.

In step S516, it is determined whether the six actual measured current values are all lower than the current determination threshold value. The judgment result of step S516 is YES.

Step S518 is executed to determine whether the cumulative operating time of the air conditioner 300 is greater than the operating time determination threshold. The value range of the running time determination threshold may be 200-500h, for example, 200h, 300h, 400h, 500h. Take the running time judgment threshold of 400h as an example. Assuming that the accumulated running time is 410h, the judgment result of step S518 is YES.

Step S520 is performed to determine that the dust filter 103 is in a clogged state.

In step S522, the controller 400 sends a cleaning signal and clears the accumulated operating time of the air conditioner 300.

The method for determining the clogging degree of the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention first determines whether the continuously obtained multiple measured current values are all lower than the current judgment threshold. When the multiple measured current values are all lower than the current judgment threshold, Then judge whether the cumulative running time of the air conditioner 300 is greater than the running time judgment threshold. When the cumulative running time is greater than the running time judgment threshold, it is judged that the dust filter 103 is in a clogged state, which improves the accuracy of the judgment of the degree of clogging of the dust filter 103 and reduces misjudgments. , Improve user experience.

6 is a schematic flowchart of a method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 according to an embodiment of the present invention. The method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 includes the following steps:

S602: Obtain the operation mode of the air conditioner 300, and determine that the air conditioner 300 is in a heating mode, a cooling mode, or an air supply mode;

S604: Obtain the initial current value of the motor 131 of the indoor fan 130 of the indoor unit 100 of the air conditioner 300 corresponding to the operating mode, where the initial current value is the motor current value obtained after the air conditioner 300 is adjusted to the operating mode during the initialization process, The heating mode corresponds to the initial heating current value, the cooling mode corresponds to the initial cooling current value, and the air supply mode corresponds to the initial current value of the air supply;

S606: Obtain the current of the motor 131 multiple times in succession: each time the air conditioner 300 is turned on and runs in the operating mode, it obtains the current of the motor 131 to obtain a measured current value, and continuously records multiple times to obtain multiple measured current values;

S608: Judge whether multiple measured current values are all greater than or equal to the initial current value;

S610: If the judgment result of step S608 is yes, it is judged that the dust filter 103 is in a clean state. If the judgment result of step S608 is no, return to step S606.

The determination method of the embodiment of the present invention also proposes that when the multiple measured current values are all greater than the initial current value, the dust filter 103 is considered to be in a clean state.

The following will take the cooling mode as an example to illustrate the determination method shown in FIG. 6 as an example. It should be understood that the numerical values in the following description are for reference only.

In step S602, it is determined that the air conditioner 300 is in the cooling mode.

In step S604, the initial current value corresponding to the cooling mode is 25mA (after the installation of the air conditioner 300 is completed, it is powered on for the first time to control it to enter the cooling mode, and the current of the motor 131 of the indoor fan 130 is obtained 5 times to obtain 24mA, 25mA, 25mA, 25mA, 26mA, calculate the average value, determine the initial refrigeration current value is 25mA).

In step S5606, each time the air conditioner 300 is turned on and runs in the cooling mode, it obtains the current of the motor 131 and obtains a measured current value, which is recorded 6 times continuously, and 6 measured current values are obtained, which are 25mA, 26mA, 26mA, and 25.5mA respectively. , 26mA, 26mA.

In step S608, it is determined whether the multiple actual measured current values are all greater than or equal to the initial current value. The judgment result of step S608 is YES.

Step S610 is performed to determine that the dust filter 103 is in a clean state.

The method for determining the degree of clogging of the air conditioner 300 and the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention proposes that the current value of the motor 131 obtained after the air conditioner 300 is adjusted to the operating mode during the initialization process is used as the initial current of the operating mode. The degree of clogging of the dust filter 103 is determined by the magnitudes of multiple measured current values and initial current values, which can avoid misjudgment of the clogging of the dust filter 103 caused by the installation position of the indoor unit 100 being too close to the ceiling of the indoor roof.

Further, the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 of the embodiment of the present invention first determines whether the obtained multiple measured current values are all lower than the current judgment threshold, and when the multiple measured current values are all lower than the current judgment threshold When the accumulated operating time of the air conditioner 300 is greater than the operating time threshold, it is determined whether the accumulated operating time of the air conditioner 300 is greater than the threshold of operating time. When the accumulated operating time is greater than the threshold of operating time, it is determined that the dust filter 103 is clogged. Misjudgment improves user experience.

Further, in the method for determining the degree of clogging of the dust filter 103 of the air conditioner 300 according to the embodiment of the present invention, the preset current determination difference is determined according to the indoor humidity value of the indoor environment in which the indoor unit 100 is located, which can avoid appearing in the environment. When the humidity is high, because the condensed water covers the surface of the indoor heat exchanger 120, the air duct is blocked, which is a misjudgment similar to the blockage of the dust filter 103.

So far, those skilled in the art should realize that although multiple exemplary embodiments of the present invention have been illustrated and described in detail herein, they can still be disclosed according to the present invention without departing from the spirit and scope of the present invention. The content directly determines or deduces many other variations or modifications that conform to the principles of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all these other variations or modifications.

Claims

The preset current determination difference is determined according to the indoor humidity value of the indoor environment where the indoor unit is located.
The determination method according to claim 6, wherein the determining the preset current determination difference value according to the indoor humidity value of the indoor environment in which the indoor unit is located comprises the steps of:

Acquiring a current compensation value corresponding to the indoor humidity value;

The sum of the reference setting value and the current compensation value is calculated to obtain the preset current determination difference.
The determination method according to claim 7, wherein:

Obtain the indoor humidity value through a humidity sensor provided outside the indoor unit; and/or

The indoor humidity value is calculated by the following formula:

Rh=(a×freq+c-ΔT′)/b,

ΔT′={ΔT×[1-g×(Troom-27)]+d×(Toutdoor-35)}×e+f,

ΔT=Troom-Tincoil,

Where Rh is the indoor humidity value, freq is the operating frequency of the compressor of the outdoor unit of the air conditioner, Troom is the indoor ambient temperature where the indoor unit is located, and Toutdoor is the outdoor ambient temperature where the outdoor unit is located , Tincoil is the coil temperature of the heat exchanger of the indoor unit, a is the compressor frequency correction constant, b is the indoor humidity correction constant, c is the indoor unit coil temperature correction constant, d is the outdoor ambient temperature correction constant, e Is the indoor fan wind speed correction constant, f is the outdoor fan wind speed correction constant, and g is the indoor ambient temperature correction constant.
An air conditioner, including:

The indoor unit has an indoor fan, and a dust filter is arranged at the air inlet of the indoor unit; and

A controller having a memory and a processor, and a control program is stored in the memory. When the control program is executed by the processor, it is used to implement the dust filter of the air conditioner according to any one of claims 1-8 How to determine the degree of congestion of the network.
The air conditioner according to claim 9, wherein:

The controller is further configured to: when it is determined that the dust filter is in a clogged state, send a cleaning signal and clear the accumulated operating time of the air conditioner.