WO2021057468A1

WO2021057468A1 - Method for determining degree of blockage of filter of air conditioner, and air conditioner

Info

Publication number: WO2021057468A1
Application number: PCT/CN2020/114073
Authority: WO
Inventors: 陈建龙; 张飞; 陆建松; 鞠龙家; 宋威; 姚永祥; 李淑云
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: CN110749034A; CN110749034B

Abstract

A method for determining the degree of blockage of a filter of an air conditioner, comprising: acquiring the humidity of an environment where the indoor unit of the air conditioner is located to obtain an indoor humidity value; acquiring a current of the motor of the indoor fan of the indoor unit to obtain a measured current value; acquiring a current determination threshold corresponding to the indoor humidity value; and determining, according to a comparison result of the measured current value and the current determination threshold, the degree of blockage of the filter. The air conditioner and the method for determining the degree of blockage of the filter of an air conditioner of the present invention improve the accuracy rate of determining the degree of blockage of the filter, reduce incorrect determinations and improve 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 humidity of the environment where the indoor unit of the air conditioner is located, and obtain the indoor humidity value;

Obtain the current of the motor of the indoor fan of the indoor unit, and obtain the measured current value;

Obtain the current determination threshold corresponding to the indoor humidity value;

Determine the degree of clogging of the dust filter based on the measured current value and the current judgment threshold.

Optionally, the step of obtaining the current determination threshold corresponding to the indoor humidity value includes:

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

The difference between the first reference setting value and the current compensation value is calculated to obtain the current determination threshold.

Optionally, the value range of the first reference set value is 20mA-30mA;

The current compensation value is not more than 5mA.

Optionally, the indoor fan has multiple wind speed gears;

The corresponding first reference setting value is determined according to the wind speed gear.

Optionally, the step of judging the degree of clogging of the dust filter according to the measured current value and the current judging threshold value includes:

When the measured current value is less than the current determination threshold, it is determined that the dust filter is in the first blocked state.

Optionally, the step of judging the degree of clogging of the dust filter based on the measured current value and the current judgment threshold value further includes:

When the actual measured current value is greater than the second reference setting value, it is determined that the dust filter is in a clean state;

Wherein, the second reference setting value is greater than the first reference setting value.

Optionally, the value range of the second reference setting value is 21 mA-31 mA.

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 the first clogged state.

The method for determining the degree of clogging of the air conditioner and the air conditioner dust filter of the present invention proposes to consider the indoor environmental humidity when determining the degree of clogging of the dust filter, set different indoor humidity values corresponding to different current determination thresholds, and then compare the actual measurement of the motor The current value and the current determination threshold value corresponding to the current indoor humidity value are used to determine the degree of clogging of the dust filter, which can avoid the air duct blockage caused by the condensed water covering the surface of the indoor heat exchanger when the ambient humidity is high. The formation of a misjudgment similar to the clogging of the dust filter improves the accuracy of the judgment of the degree of clogging of the dust filter, reduces misjudgments and improves user experience.

Further, the determination method of the present invention also proposes to set different first reference setting values in consideration of the wind speed gear of the indoor fan when determining the degree of clogging of the dust filter, which can further improve the accuracy of determining the degree of clogging 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.

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 humidity of the environment where the indoor unit 100 of the air conditioner 300 is located, and obtain an indoor humidity value;

S204: Obtain the current of the motor 131 of the indoor fan 130 of the indoor unit 100 to obtain an actual measured current value;

S206: Obtain a current determination threshold corresponding to the indoor humidity value;

S208: Determine the degree of clogging of the dust filter 103 according to the actual measured current value and the current determination threshold.

It can be understood that step S202 and step S204 may be performed at the same time, or step S202 may be performed first and then step S204 may be performed, or step S204 may be performed first and then step S202 may be performed. In particular, step S202 and step S206 can also be performed first, and then step S204 is performed.

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.

When the dust filter 103 is clogged, compared with when the dust filter 103 is not clogged, the air volume of the air conditioner 300 becomes smaller, the load of the motor 131 of the indoor fan 130 becomes smaller, and the current value of the motor 131 becomes lower. It is determined whether the dust filter 103 is clogged or not by detecting the magnitude of the current value of the motor 131 of the indoor fan 130. However, if only the current value of the motor 131 of the indoor fan 130 is considered, when the ambient humidity is high, the condensed water covers the surface of the indoor heat exchanger 120 and the air outlet is blocked, which is similar to the dust filter 103 blockage. At this time, although the dust filter 103 is not clogged, because the current value of the motor 131 of the indoor fan 130 becomes low, the controller 400 will still consider it as clogged, causing a misjudgment. 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 proposes to consider the indoor environmental humidity when determining the degree of clogging of the dust filter 103, set different indoor humidity values corresponding to different current determination thresholds, and then compare the motors The measured current value of 131 and the current determination threshold corresponding to the current indoor humidity value are used to determine the degree of clogging of the dust filter 103, which improves the accuracy of determining the degree of clogging of the dust filter 103, reduces misjudgments, and improves user experience.

In some embodiments, obtaining the current determination threshold corresponding to the indoor humidity value in step S206 further includes:

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, a current determination threshold may be directly set for each indoor humidity value or each indoor humidity range interval, or a fixed current determination threshold may be set first. Set a current compensation value for each indoor humidity value or each indoor humidity range interval, and then calculate the current judgment threshold by calculating the difference between the first reference setting value and the current compensation value . The first reference setting value is the current value of the motor 131 when the degree of clogging of the dust filter 103 has reached the time when cleaning is required. Therefore, by setting the first reference setting value to match different current compensation values, the current determination threshold is calculated compared to It may be better to understand logically to set each current judgment threshold directly. Here, setting a current judgment threshold or current compensation value for each indoor humidity value will make the judgment result more accurate, but considering that the degree of clogging of the dust filter 103 does not need to be subdivided to such a degree, for each indoor humidity value It is more practical to set the current judgment threshold or current compensation value in the humidity range.

The two methods of determining the current threshold will be explained in detail in the following list. 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 %.

Table 1 Set current judgment threshold for each indoor humidity zone

室内湿度范围区间(％)Indoor humidity range (%)	电流判定阈值(mA)Current judgment threshold (mA)
＜A＜A	F ₁ F ₁
A-BA-B	F ₂ F ₂
B-CB-C	F ₃ F ₃
C-DC-D	F ₄ F ₄
D-ED-E	F ₅ F ₅
＞E＞E	F ₆ F ₆

Table 1 shows how the air conditioner 300 sets the current determination threshold value for each indoor humidity range section. The current determination threshold values F ₁ to F ₆ can range from 15 mA to 30 mA, and from F ₁ to F ₆ decreases as the indoor humidity value increases. For example, the current determination threshold F ₁ is 20mA, the current determination threshold F ₂ is 19.5mA, the current determination threshold value F ₃ is 19mA, the current determination threshold value F ₄ to 18mA current determination threshold F ₅ is 16mA, the current determination threshold value F6 is 15mA. Step S202 is assumed that the indoor humidity is 22% obtained in the step S206 that the indoor humidity is 22% <A interval, corresponding to the current determination threshold value F ₁ is 20mA. And assuming, in step S202 the indoor humidity is 32% is obtained, step S206 determines whether the indoor humidity is 32% of the value of the interval BC, corresponding to the current determination threshold value F ₃ is 19mA. Suppose further that, in step S202 the obtained indoor humidity is 50% is determined in step S206 that the indoor humidity is 50% of the DE value interval corresponding to the current determination threshold value F ₅ to 16mA.

Table 2 Set current compensation value for each 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)	电流判定阈值(mA)Current judgment threshold (mA)
＜A＜A	Y ₁ Y ₁	F ₁＝X-Y ₁ F ₁ ＝XY ₁
A-BA-B	Y ₂ Y ₂	F ₂＝X-Y ₂ F ₂ ＝XY ₂
B-CB-C	Y ₃ Y ₃	F ₃＝X-Y ₃ F ₃ ＝XY ₃
C-DC-D	Y ₄ Y ₄	F ₄＝X-Y ₄ F ₄ ＝XY ₄
D-ED-E	Y ₅ Y ₅	F ₅＝X-Y ₅ F ₅ ＝XY ₅
＞E＞E	Y ₆ Y ₆	F ₆＝X-Y ₆ F ₆ ＝XY ₆

Table 2 shows a situation where the air conditioner 300 is set with the first reference setting value X, and the current compensation value is set for each indoor humidity section. The value range of the first reference set value X may be 20mA-30mA, such as 20mA, 23mA, 27mA. The range of the current compensation value Y ₁ to Y ₆ can be 0mA-2.5mA or 0mA-5.0mA, and the range from Y ₁ to Y ₆ increases as the indoor humidity value increases. For example, the first reference setting value X is 20 mA, 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, and the current compensation value Y ₅ is 3.0 mA, and the current compensation value Y6 is 5.0 mA. Assuming that the indoor humidity value obtained in step S202 is 22%, step S206 determines that the indoor humidity value 22% is in the interval <A, corresponding to the current compensation value Y ₁ being 0 mA, and calculating the first reference set value X and the current compensation value Y ₁ difference to obtain the current determination threshold F ₁ is 20mA. The current compensation value Y ₁ may be 0 mA, that is, in the determination method of the embodiment of the present invention, it can be considered that when the indoor humidity value is less than a certain interval, there is no need to compensate the first reference set value X. In combination with the operation mode of the air conditioner 300, when the air conditioner 300 is in the heating mode, the air humidity is usually relatively low. Therefore, the determination method of the embodiment of the present invention is particularly suitable for the situation where the air conditioner 300 is in the cooling mode. It is also assumed that the indoor humidity value obtained in step S202 is 32%, and step S206 determines that 32% of the indoor humidity value is in the BC interval, corresponding to the current compensation value Y ₃ being 1.0 mA, and calculates the first reference set value X and the current compensation value The difference of Y ₃ yields a current judgment threshold F ₃ of 19 mA. Suppose again that the indoor humidity value obtained in step S202 is 50%, and step S206 determines that 50% of the indoor humidity value is in the DE interval, corresponding to the current compensation value Y ₅ of 3.0 mA, and calculates the first reference set value X and the current compensation value The difference of Y ₅ yields a current judgment threshold F _{5 of 17} mA.

In some embodiments, the indoor fan 130 has a plurality of wind speed gear positions, and the corresponding first reference setting value X is determined according to the wind speed gear positions. The indoor fan 130 of the air conditioner 300 is commonly divided into three wind speed gears: high wind speed, medium wind speed, and low wind speed. Here, it is proposed to set the first reference setting value for different wind speed gears to further improve the accuracy of determining the degree of clogging of the dust filter 103. Generally, it is only necessary to determine the degree of clogging of the dust filter 103 at the initial stage of starting the air conditioner 300. At this time, the wind speed of the indoor fan 130 is a fixed value. Therefore, only a first reference setting value can be set, but when you want to make a real-time determination At this time, it is preferable to adopt a determination method of respectively setting the first reference setting value for different wind speed gears. This method can further improve the accuracy of determining the degree of clogging of the dust filter 103. In other embodiments, the current compensation value corresponds to the indoor humidity value and the wind speed gear, that is to say, when the same indoor humidity value is set, different current compensation values are set for different wind speed gears, but this control The logic may be a bit too complicated.

In some embodiments, the step S208 of determining the degree of clogging of the dust filter 103 according to the magnitude of the measured current value and the current determination threshold includes: when the measured current value is less than the current determination threshold, determining that the dust filter 103 is in the first clogged state. The first clogging state, that is, the degree of clogging of the dust filter 103 has reached the state when cleaning is required, and can be referred to as a severe clogging state. Further, the controller 400 of the air conditioner 300 is further configured to send a cleaning signal when it is determined that the dust filter 103 is in the first clogged state.

In some embodiments, the step S208 of determining the degree of clogging of the dust filter 103 according to the magnitude of the actual measured current value and the current determination threshold further includes: when the actual measured current value is greater than the second reference set value, determining that the dust filter 103 is in a clean state ; Wherein, the second reference set value is greater than the first reference set value. The second reference setting value is the current value of the motor 131 when the dust filter 103 is in a clean state. The value range of the second reference setting value can be 21mA-31mA, such as 25mA, 27mA, 30mA.

In some embodiments, the step S208 of judging the degree of clogging of the dust filter 103 according to the magnitude of the measured current value and the current judging threshold value further includes: when the measured current value is less than the second reference setting value and greater than the third reference setting value , It is determined that the dust filter 103 is in the second blocked state; wherein, the third reference setting value is greater than the current determination threshold value, but less than the second reference setting value; and when the actual measured current value is less than the third reference setting value, the dust filter is determined 103 is in the third blocked state. The determination method of the embodiment of the present invention also proposes to set a third reference setting value to be greater than the current determination threshold but less than the second reference setting value to subdivide the severe clogging state to the clean state into the second clogging State and the third blocked state. The second blockage state may be referred to as a light blockage state, and the third blockage state may be referred to as a moderate blockage state.

The third reference setting value is greater than the current determination threshold value but less than the second reference setting value. Preferably, the third reference setting value can be set to the average value of the current determination threshold value and the second reference setting value. For example, the first reference setting value may be 20 mA, and the current compensation value at a certain indoor humidity value is 3 mA, and the current determination threshold value is 17 mA. The second reference setting value can be 27mA. The third reference setting value can be 22mA. When the measured current value is 16mA, it can be determined that the dust filter 103 is in a heavily clogged state, and the controller 400 sends a cleaning signal; when the measured current value is 20mA, it can be determined that the dust filter 103 is in a moderately clogged state; when the measured current value is 26mA It can be determined that the dust filter 103 is in a lightly clogged state; when the measured current value is 29 mA, it can be determined that the dust filter 103 is in a clean state. The determination method of the embodiment of the present invention sets a plurality of reference setting values, and determines that the dust filter 103 has a clean state, a first clogged state, a second clogged state, and a third clogged state according to the different intervals of the actual measured current value. The four levels of congestion can provide different levels of congestion determination, but at the same time it is not too subdivided and more suitable for user needs.

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.

In addition, the determination method of the embodiment of the present invention may also compensate the actual measured current value. Specifically, 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 following steps:

Obtain the humidity of the environment where the indoor unit 100 of the air conditioner 300 is located, and obtain the indoor humidity value;

Obtain the current of the motor 131 of the indoor fan 130 of the indoor unit 100 to obtain the actual measured current value;

Calculate the sum of the measured current value and the current compensation value to obtain the judgment value;

The degree of clogging of the dust filter 103 is determined according to the size of the determination value and the first reference setting value.

Generally, it is only necessary to determine the degree of clogging of the dust filter 103 at the initial stage of starting the air conditioner 300, so that the first reference set value can be compensated. Compensating the actual measured current value is more suitable for situations where the degree of blockage needs to be determined in real time, but this method will increase the operating cycle of the controller 400. For example, continuing the previous assumptions, in Table 2 the first reference setting value X is 20mA, 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, and the current compensation value Y ₄ is 2.0 mA, current compensation value Y ₅ is 3.0 mA, and current compensation value Y 6 is 5.0 mA. At the same time, it is assumed that the obtained indoor humidity value is 50%, and the actual measured current value obtained is 16 mA. The indoor humidity value of 50% is in the DE interval, and the corresponding current compensation value Y ₅ is 3.0 mA. Calculate the sum of the measured current value and the current compensation value Y ₅ , and the judgment value is 19 mA. The judgment value of 19 mA is less than the first reference setting value of 20 mA, and it is determined that the dust filter 103 is in a severely clogged state, and the controller 400 sends a cleaning signal.

Hereinafter, an example of the air conditioner 300 of an embodiment of the present invention from being turned on to the blockage determination of the dust filter 103 will be described in detail. 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: Turn on the air conditioner 300;

S504: 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;

S506: Obtain a current compensation value corresponding to the indoor humidity value;

S508: Calculate the difference between the first reference setting value and the current compensation value to obtain the current determination threshold;

S510: Obtain the current of the motor 131 of the indoor fan 130 of the indoor unit 100 to obtain an actual measured current value;

S512: Determine whether the actually measured current value is less than the current determination threshold;

S514: If the judgment result of step S512 is yes, it is judged that the dust filter 103 is in the first clogged state;

S516: The controller 400 sends out a cleaning signal;

S518: If the judgment result of step S512 is no, continue to judge whether the actual measured current value is greater than the second reference set value;

S520: If the judgment result of step S518 is yes, it is judged that the dust filter 103 is in a clean state;

S522: If the judgment result of step S518 is no, continue to judge whether the actual measured current value is greater than the third reference set value;

S524: If the judgment result of step S522 is yes, it is judged that the dust filter 103 is in the second blocked state;

S526: If the judgment result of step S522 is no, it is judged that the dust filter 103 is in the third clogged state.

It can be understood that step S504-step S508 can be performed simultaneously with step S510, or can be performed sequentially.

The method for determining the degree of clogging of the air conditioner 300 and the dust filter 103 of the air conditioner 300 of the embodiment of the present invention proposes to consider the indoor environmental humidity when determining the degree of clogging of the dust filter 103, and to set different indoor humidity values corresponding to different current determination thresholds. Then, by comparing the measured current value of the motor 131 with the current determination threshold value corresponding to the current indoor humidity value, the degree of clogging of the dust filter 103 can be determined, which can avoid the occurrence of condensed water covering the indoor heat exchanger when the environmental humidity is high. A misjudgment situation similar to the blockage of the dust filter 103 caused by the blockage of the air duct caused by the surface of the 120, improves the accuracy of determining the degree of blockage of the dust filter 103, reduces misjudgments, and improves user experience.

Further, the determination method of the embodiment of the present invention also proposes to consider the wind speed of the indoor fan 130 when determining the degree of clogging of the dust filter 103, which can further improve the accuracy of determining the degree of clogging 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

A method for determining the degree of clogging of a dust filter of an air conditioner includes:

Obtaining the humidity of the environment where the indoor unit of the air conditioner is located, and obtaining the indoor humidity value;

Obtaining the current of the motor of the indoor fan of the indoor unit to obtain the actual measured current value;

Acquiring a current determination threshold corresponding to the indoor humidity value;

The degree of clogging of the dust filter is determined according to the magnitude of the actual measured current value and the current determination threshold value.
The determination method according to claim 1, wherein the step of obtaining a current determination threshold corresponding to the indoor humidity value comprises:

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

The difference between the first reference setting value and the current compensation value is calculated to obtain the current determination threshold.
The determination method according to claim 2, wherein:

The value range of the first reference setting value is 20mA-30mA;

The current compensation value is not more than 5mA.
The determination method according to claim 2, wherein:

The indoor fan has a plurality of wind speed gear positions;

The corresponding first reference setting value is determined according to the wind speed gear position.
The determination method according to claim 2, wherein the step of determining the degree of clogging of the dust filter based on the actual measured current value and the current determination threshold value comprises:

When the actual measured current value is less than the current determination threshold value, it is determined that the dust filter is in the first blocked state.
The determination method according to claim 5, wherein the step of determining the degree of clogging of the dust filter based on the actual measured current value and the current determination threshold value further comprises:

When the actual measured current value is greater than the second reference setting value, it is determined that the dust filter is in a clean state;

Wherein, the second reference setting value is greater than the first reference setting value.
The determination method according to claim 6, wherein:

The value range of the second reference setting value is 21mA-31mA.
The determination method according to claim 1, 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 send a cleaning signal when it is determined that the dust filter is in the first clogged state.