Air duct blockage identification method, controller, fresh air system and storage medium

Abstract

The embodiment of the invention provides an air duct blockage recognition method, a controller, a fresh air system and a storage medium, and the air duct blockage recognition method comprises the following steps that firstly, an air supply fan is controlled to operate at a target air speed grade; then, under the condition that the air supply fan operates at the target air speed grade, current fan parameters and environment air parameters of the air supply fan are obtained; and then, the blockage state of the air duct is determined according to the current fan parameters and the ambient air parameters. Due to the fact that fan parameters and environment air parameters of the air supply fan can be affected when the air duct is blocked, the blockage state of the air duct can be comprehensively analyzed according to the fan parameters and the environment air parameters under the condition that the air supply fan operates at the same rotating speed, and the blockage state of the air duct is analyzed. Even if the filter screen does not reach the use time limit, filth blockage of the air duct can be detected in time, so that a user can be reminded to clean the air duct or the filter screen in advance, and the energy efficiency of the whole machine can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning regulation, and particularly relates to a method for identifying air duct blockage, a controller, a fresh air system, and a storage medium. Background Art

[0002] In the related art, under the pressure difference generated by the rotation of the air supply fan of the fresh air device, outdoor air can be introduced or room air can be returned to the room before being cooled or heated by the internal heat exchanger and filtered through the filter screen and then transported to the room. Since dust accumulates on the surface of the filter screen after long-term use, in order to avoid the reduction of the air volume transmitted to the room and affecting the heat exchange effect, it is necessary to replace the filter screen regularly.

[0003] Regarding the replacement rule of the filter screen, currently, a fixed time limit is usually set according to the filter screen attributes and the usage environment. When the usage time exceeds this fixed time limit, the user will be prompted to replace the filter screen. For this replacement method, the setting is simple, but it lacks consideration of environmental change factors. Before the usage time limit of the filter screen is reached, due to reasons such as a humid or dusty usage environment, the air duct may be severely blocked, resulting in a decrease in the overall energy efficiency of the machine. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides a method for identifying air duct blockage, a controller, a fresh air system, and a storage medium, aiming to detect the blockage phenomenon of the air duct in time and improve the overall energy efficiency of the machine.

[0005] In a first aspect, an embodiment of the present application provides a method for identifying air duct blockage, which is applied to a fresh air system. The fresh air system includes an air supply fan and a heat pump cycle device. The heat pump cycle device includes an indoor heat exchanger and an outdoor heat exchanger. The indoor heat exchanger and the outdoor heat exchanger are connected through a refrigerant pipeline. The air supply fan and the indoor heat exchanger are used to be installed in the air duct. The method for identifying air duct blockage includes:

[0006] Controlling the air supply fan to operate at a target wind speed level;

[0007] Obtaining the current fan parameters of the air supply fan and the ambient air parameters;

[0008] Determining the blockage state of the air duct according to the current fan parameters and the ambient air parameters.

[0009] According to some embodiments of the present application, the determining the blockage state of the air duct according to the current fan parameters and the ambient air parameters includes:

[0010] Obtain the initial fan parameters corresponding to the target wind speed level, and determine the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the initial fan parameters;

[0011] Determine the air parameter anomaly flag according to the ambient air parameters and preset parameters;

[0012] Determine the blockage state of the air duct according to the fan parameter attenuation flag and the air parameter anomaly flag.

[0013] According to some embodiments of the present application, the obtaining of the initial fan parameters corresponding to the target wind speed level includes:

[0014] When the fan parameters of the air supply fan are zero, control the air supply fan to operate at the target wind speed level and continue to operate for a first duration, and use the fan parameters after the first duration as the initial fan parameters.

[0015] According to some embodiments of the present application, the determining of the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the initial fan parameters includes:

[0016] Determine the fan parameter threshold according to the initial fan parameters and preset downward adjustment parameters;

[0017] Determine the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the fan parameter threshold.

[0018] According to some embodiments of the present application, the determining of the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the fan parameter threshold includes one of the following:

[0019] When the current fan parameters are less than the fan parameter threshold continuously or cumulatively reach a second duration, set the fan parameter attenuation flag to a first character, where the first character is used to characterize the degree of fan parameter attenuation;

[0020] When the current fan parameters are less than the fan parameter threshold and do not continuously and cumulatively reach the second duration, set the fan parameter attenuation flag to a second character, where the second character is used to characterize the degree of fan parameter attenuation, and the degree of fan parameter attenuation corresponding to the second character is less than the degree of fan parameter attenuation corresponding to the first character.

[0021] According to some embodiments of the present application, the current fan parameters and the initial fan parameters are power parameters or current parameters.

[0022] According to some embodiments of the present application, the ambient air parameters include room air parameters; the determining of the air parameter anomaly flag according to the ambient air parameters and preset parameters includes:

[0023] Control the air supply fan to operate at the target wind speed level and continue for a third duration, and obtain the parameter change amount of the room air parameters before and after the third duration;

[0024] Determine the air parameter abnormality flag according to the parameter change amount and the preset parameters.

[0025] According to some embodiments of the present application, the determining the air parameter abnormality flag according to the parameter change amount and the preset parameters includes one of the following:

[0026] When the parameter change amount is less than the preset change amount, set the air parameter abnormality flag to the third character, where the third character is used to indicate that the environmental air parameters do not meet the qualified conditions;

[0027] When the parameter change amount is greater than or equal to the preset change amount, set the air parameter abnormality flag to the fourth character, where the fourth character is used to indicate that the environmental air parameters meet the qualified conditions.

[0028] According to some embodiments of the present application, the environmental air parameters include room temperature parameters and / or room humidity parameters.

[0029] According to some embodiments of the present application, the environmental air parameters include fresh air parameters and air supply parameters; the determining the air parameter abnormality flag according to the environmental air parameters and the preset parameters includes:

[0030] Determine the parameter difference between the fresh air parameters and the air supply parameters;

[0031] Determine the air parameter abnormality flag according to the parameter difference and the preset parameters.

[0032] According to some embodiments of the present application, the determining the air parameter abnormality flag according to the parameter difference and the preset parameters includes one of the following:

[0033] In the cooling mode, when the parameter difference is less than the first preset difference and lasts for a fourth duration, set the air parameter abnormality flag to the third character, where the third character is used to indicate that the environmental air parameters do not meet the qualified conditions;

[0034] In the cooling mode, when the parameter difference does not last for the fourth duration and remains less than the first preset difference, set the air parameter abnormality flag to the fourth character, where the fourth character is used to indicate that the environmental air parameters meet the qualified conditions;

[0035] In the heating mode, when the parameter difference is greater than the second preset difference and lasts for a fifth duration, set the air parameter abnormality flag to the third character;

[0036] In the heating mode, when the parameter difference does not remain greater than the second preset difference for the fifth duration, set the air parameter anomaly flag to the fourth character.

[0037] According to some embodiments of the present application, in the cooling mode, the parameter difference includes one of the following: the difference between the fresh air moisture content and the supply air moisture content, the difference between the fresh air enthalpy value and the supply air enthalpy value;

[0038] In the heating mode, the parameter difference includes: the difference between the fresh air enthalpy value and the supply air enthalpy value.

[0039] According to some embodiments of the present application, determining the blockage state of the air duct based on the fan parameter decay flag and the air parameter anomaly flag includes one of the following:

[0040] When the fan parameter decay flag is the first character and the air parameter anomaly flag is the third character, determine that there is a blockage in the air duct;

[0041] When the fan parameter decay flag is the second character or the air parameter anomaly flag is the fourth character, determine that there is no blockage in the air duct.

[0042] In a second aspect, an embodiment of the present application provides a controller, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where when the processor runs the computer program, it executes the air duct blockage identification method in the first aspect as described above.

[0043] In a third aspect, an embodiment of the present application provides a fresh air system, including the controller in the second aspect as described above.

[0044] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for executing the air duct blockage identification method in the first aspect as described above.

[0045] According to the technical solution of the embodiment of the present application, it has at least the following beneficial effects: First, in order to detect the blockage state of the air duct, the embodiment of the present application will control the air supply fan to operate at the target wind speed level; then, when the air supply fan is operating at the target wind speed level, obtain the current fan parameters of the air supply fan and the ambient air parameters; then, the embodiment of the present application determines the blockage state of the air duct according to the current fan parameters and the ambient air parameters. Since the blockage of the air duct will affect the fan parameters of the air supply fan and the ambient air parameters, therefore, the embodiment of the present application can comprehensively analyze the blockage state of the air duct according to the fan parameters and the ambient air parameters when the air supply fan operates at the same rotation speed. Even before the filter reaches the service life, it can detect in time that there is dirt blockage in the air duct, so as to be able to remind the user to clean the air duct or the filter in advance, thereby improving the energy efficiency of the whole machine.

[0046] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0047] The drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

[0048] Figure 1 is a schematic structural diagram of a heat pump water system provided by an embodiment of the present application;

[0049] Figure 2 is a flowchart of a method for identifying air duct blockage provided by an embodiment of the present application;

[0050] Figure 3 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0051] Figure 4 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0052] Figure 5 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0053] Figure 6 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0054] Figure 7 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0055] Figure 8 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0056] Figure 9 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0057] Figure 10 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0058] Figure 11 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0059] Figure 12 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0060] Figure 13 is a flowchart of a comprehensive judgment of air duct dirt blockage provided by an embodiment of the present application;

[0061] Figure 14 is a flowchart of a comprehensive judgment of air duct dirt blockage provided by another embodiment of the present application;

[0062] Figure 15 is a flowchart of obtaining an initial power provided by an embodiment of the present application;

[0063] Figure 16 is a flowchart of power attenuation analysis provided by an embodiment of the present application;

[0064] Figure 17 is a flowchart of temperature and humidity reaching analysis provided by an embodiment of the present application;

[0065] Figure 18 is a flowchart of moisture content and enthalpy value analysis provided by an embodiment of the present application;

[0066] Figure 19 is a flowchart of a comprehensive analysis of air duct dirt blockage provided by an embodiment of the present application;

[0067] Figure 20 is a flowchart of a comprehensive analysis of air duct dirt blockage provided by another embodiment of the present application;

[0068] Figure 21 is a schematic diagram of a controller for executing the air duct blockage identification method provided by an embodiment of the present application. Detailed Description of the Embodiment

[0069] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as a limitation of the present application.

[0070] In the description of the present application, it should be understood that when it comes to orientation descriptions, such as the orientations or positional relationships indicated by up, down, front, back, left, right, etc., they are based on the orientations or positional relationships shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0071] In the description of the present application, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, "greater than", "less than", "exceeding", etc. are understood not to include the recited number, and "above", "below", "within", etc. are understood to include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0072] In the description of the present application, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0073] In some cases, under the pressure difference generated by the rotation of the supply air fan of the fresh air device, before the outdoor air can be introduced or the room air can be returned to the room, the air can be cooled or heated by an internal heat exchanger, and at the same time, it will be filtered by a filter screen and then delivered to the room. Since dust will accumulate on the surface of the filter screen after long-term use, in order to avoid a reduction in the air volume delivered to the room and affecting the heat exchange effect, it is necessary to replace the filter screen regularly.

[0074] Regarding the replacement rule of the filter screen, currently, usually a fixed time limit is set according to the filter screen attributes and the usage environment. When the usage time exceeds this fixed time limit, the user will be prompted to replace the filter screen. For this replacement method, the setting is simple, but it lacks consideration of environmental change factors. It is possible that before the usage time limit of the filter screen is reached, due to reasons such as a humid or dusty usage environment, the air duct has become severely blocked, resulting in a decrease in the overall machine energy efficiency.

[0075] Based on the above situation, the embodiments of the present application propose a method for identifying air duct blockage, a controller, a fresh air system, and a storage medium, aiming to detect the blockage phenomenon of the air duct in a timely manner and improve the overall machine energy efficiency.

[0076] Next, with reference to the drawings, each embodiment of the fresh air system of the present application will be further described.

[0077] As Figure 1 shown, Figure 1 is a schematic structural diagram of a fresh air system provided by an embodiment of the present application.

[0078] In one embodiment, the fresh air system includes, but is not limited to, a supply air fan 110 and a heat pump cycle device. Among them, the heat pump cycle device includes, but is not limited to, an indoor heat exchanger 220 and an outdoor heat exchanger 210. The indoor heat exchanger 220 and the outdoor heat exchanger 210 are connected through a refrigerant pipeline. The supply air fan 110 and the indoor heat exchanger 220 are used to be installed in the air duct.

[0079] It should be noted that the air duct where the supply air fan 110 and the indoor heat exchanger 220 are installed is the fresh air duct 510. Under the action of the supply air fan 110, the fresh air outdoors will enter the fresh air duct 510 and be sent indoors through the fresh air duct 510 after the heat exchange of the indoor heat exchanger 220.

[0080] In addition, it should be noted that the embodiment of the present application can cool or heat-treat the fresh air through the heat pump cycle device. Specifically, when the indoor heat exchanger 220 is an evaporator and the outdoor heat exchanger 210 is a condenser, the fresh air can be cooled; when the indoor heat exchanger 220 is a condenser and the outdoor heat exchanger 210 is an evaporator, the fresh air can be heated.

[0081] In addition, it should be noted that the embodiment of the present application can also dehumidify the fresh air through the heat pump cycle device. Specifically, in the dehumidification mode, the embodiment of the present application can dehumidify the fresh air through the indoor heat exchanger 220.

[0082] It can be understood that regarding the type of the supply air fan 110, it can be an axial flow fan, a centrifugal fan, a mixed flow fan, or other types of fans. The embodiment of the present application does not specifically limit the type of the supply air fan 110.

[0083] In one embodiment, as Figure 1 shown, the fresh air system of the embodiment of the present application further includes, but is not limited to, a filter screen 300. Among them, the filter screen 300 is installed in the fresh air duct 510 and is used to filter the fresh air outdoors.

[0084] It can be understood that regarding the position of the filter screen 300, it can be installed on the side of the indoor heat exchanger 220 close to the outdoors as Figure 1 shown, or on the side of the supply air fan 110 close to the indoors, or can be installed on both the side of the indoor heat exchanger 220 close to the outdoors and the side of the supply air fan 110 close to the indoors, or can be installed in other positions. The embodiment of the present application does not specifically limit this.

[0085] In one embodiment, as Figure 1As shown, the fresh air system of the embodiment of the present application further includes, but is not limited to, a first sensor 410, wherein the first sensor 410 is installed at the air supply outlet of the fresh air duct 510 for detecting air supply parameters.

[0086] It should be noted that in the embodiment of the present application, the air supply temperature can be detected by the first sensor 410, the air supply humidity can be detected by the first sensor 410, the moisture content of the air supply can be detected by the first sensor 410, the enthalpy value of the air supply can be detected by the first sensor 410, and other air supply parameters can be detected by the first sensor 410. The embodiment of the present application does not make specific limitations on this.

[0087] In one embodiment, as Figure 1 As shown, the fresh air system of the embodiment of the present application further includes, but is not limited to, a second sensor 420, wherein the second sensor 420 is installed at the fresh air inlet of the fresh air duct 510 for detecting fresh air parameters.

[0088] It should be noted that in the embodiment of the present application, the fresh air temperature can be detected by the second sensor 420, the fresh air humidity can be detected by the second sensor 420, the moisture content of the fresh air can be detected by the second sensor 420, the enthalpy value of the fresh air can be detected by the second sensor 420, and other fresh air parameters can be detected by the second sensor 420. The embodiment of the present application does not make specific limitations on this.

[0089] In one embodiment, as Figure 1 As shown, the fresh air system of the embodiment of the present application further includes, but is not limited to, a return air fan 120, wherein the return air fan 120 is installed in the exhaust duct 520. Specifically, under the action of the return air fan 120, the return air in the room will enter the exhaust duct 520 and be discharged to the outside through the exhaust duct 520.

[0090] It can be understood that the type of the return air fan 120 can be an axial flow fan, a centrifugal fan, a mixed flow fan, or other types of fans. The embodiment of the present application does not make specific limitations on the type of the return air fan 120.

[0091] In one embodiment, as Figure 1 As shown, the fresh air system of the embodiment of the present application further includes, but is not limited to, a heat recovery device 230, wherein the heat recovery device 230, the indoor heat exchanger 220, and the outdoor heat exchanger 210 are connected through a refrigerant pipeline, and the heat recovery device 230 is installed in the exhaust duct 520. Specifically, in order to reduce the loss of room cooling or heating caused by the exhaust air, the embodiment of the present application recovers the cooling capacity or heat of the air flowing through the exhaust duct 520 through the heat recovery device 230.

[0092] In one embodiment, asFigure 1 As shown in the figure, the fresh air system of the embodiment of the present application further includes, but is not limited to, a third sensor 430, wherein the third sensor 430 is installed at the air return opening of the exhaust air duct 520 for detecting the air return parameters, that is, the room air parameters.

[0093] It should be noted that in the embodiment of the present application, the third sensor 430 can be used to detect the air return temperature, or the third sensor 430 can be used to detect the air return humidity, or the third sensor 430 can be used to detect the moisture content of the air return, or the third sensor 430 can be used to detect the enthalpy value of the air return, or the third sensor 430 can be used to detect other air return parameters. The embodiment of the present application does not make specific limitations on this.

[0094] Specifically, as Figure 1 shown, under the operation of the air supply fan 110, the inhaled fresh air enters the machine interior through the filter screen 300. Under the combined action of the indoor heat exchanger 220, the outdoor heat exchanger 210 and the heat recovery device 230, the fresh air with adjusted temperature and humidity is delivered to the room interior through the air supply opening of the machine. Under the operation of the air return fan 120, the indoor air is discharged from the air outlet of the machine to the outside. The first sensor 410 is used to detect the moisture content Dt and the enthalpy value Ht of the air supply, the second sensor 420 is used to detect the moisture content Dn and the fresh air enthalpy value Hn of the fresh air, and the third sensor 430 is used to detect the room temperature Ti and the room humidity Ri.

[0095] Based on the hardware structure of the fresh air systems in the above various embodiments, the following respectively present the various embodiments of the air duct blockage identification method of the present application.

[0096] As Figure 2 shown, Figure 2 is a flowchart of an air duct blockage identification method provided by an embodiment of the present application; this air duct blockage identification method can be applied to the fresh air system in the above embodiment, including but not limited to step S210, step S220, and step S230.

[0097] Step S210: Control the air supply fan to operate at the target wind speed level;

[0098] Step S220: Obtain the current fan parameters of the air supply fan and the ambient air parameters;

[0099] Step S230: Determine the blockage state of the air duct according to the current fan parameters and the ambient air parameters.

[0100] In one embodiment, first, in order to detect the blockage state of the air duct, the embodiment of the present application controls the air supply fan so that the air supply fan maintains and operates at the target wind speed level; then, when the air supply fan operates at the target wind speed level, the embodiment of the present application obtains the current fan parameters of the air supply fan and also obtains the ambient air parameters; then, the embodiment of the present application determines the blockage state of the fresh air duct according to the obtained current fan parameters and ambient air parameters.

[0101] It should be noted that regarding the relationship between the above wind speed level and wind speed and air volume, there is a positive correlation between the two. Specifically, when the wind speed level is higher, the corresponding wind speed or air volume will be larger; when the wind speed level is lower, the corresponding wind speed or air volume will be smaller.

[0102] In addition, it should be noted that regarding the magnitude of the above target wind speed level, it needs to be greater than the preset wind speed level. In other words, the target wind speed level needs to be a relatively high wind speed level. The reason is that in the case of high wind speed and air volume, the detected fan parameters and ambient air parameters will deviate more from the normal values under high wind speed and air volume, so it is easier and more accurate to judge the blockage state of the air duct; on the contrary, if in the case of low wind speed and air volume, the detected fan parameters and ambient air parameters deviate less from the normal values under low wind speed and air volume, it is not easy to judge the blockage state of the air duct and the accuracy is poor.

[0103] It can be understood that regarding the number of the above target wind speed levels, it can be one or multiple. The embodiment of the present application does not make a specific limitation on the number of target wind speed levels.

[0104] It should be noted that when the number of target wind speed levels is one, the embodiment of the present application only infers the blockage state of the air duct based on one fan parameter, and the accuracy is low; while when the number of target wind speed levels is multiple, the embodiment of the present application can comprehensively infer the blockage state of the air duct based on multiple fan parameters at the same time, and the accuracy is high.

[0105] In addition, it can be understood that regarding the type of the above current fan parameters, it can be the power parameter of the air supply fan, or the current parameter of the air supply fan, or other parameters. The embodiment of the present application does not make a specific limitation on this.

[0106] In addition, it should be noted that regarding the above ambient air parameters, it can refer to the return air parameters, that is, the room air parameters. For example, the return air temperature or the return air humidity; it can also be the fresh air parameters or the supply air parameters.

[0107] It should be noted that since the blockage of the fresh air duct will affect the fan parameters of the air supply fan and the ambient air parameters, the embodiments of the present application can comprehensively analyze the blockage state of the duct according to the fan parameters and the ambient air parameters when the air supply fan operates at the same speed. Even before the filter reaches its service life, it can detect in time that there is dirt blockage in the duct, so as to be able to remind the user to clean the duct or the filter in advance, thereby improving the energy efficiency of the whole machine.

[0108] In addition, as Figure 3 shown, Figure 3 is a flowchart of a method for identifying a duct blockage provided by another embodiment of the present application; regarding determining the blockage state of the duct according to the current fan parameters and the ambient air parameters in step S230 above, it may include but is not limited to step S310, step S320, and step S330.

[0109] Step S310: Obtain the initial fan parameters corresponding to the target wind speed level, and determine the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the initial fan parameters;

[0110] Step S320: Determine the air parameter anomaly flag according to the ambient air parameters and the preset parameters;

[0111] Step S330: Determine the blockage state of the duct according to the fan parameter attenuation flag and the air parameter anomaly flag.

[0112] In an embodiment, for each target wind speed level, the embodiments of the present application will obtain the initial fan parameters at this target wind speed level and when the duct is not blocked, and then compare and analyze the initial fan parameters and the current fan parameters to determine the fan parameter attenuation flag of the air supply fan. Among them, this fan parameter attenuation flag can be used to prove whether there is dirt blockage in the duct; in addition, the embodiments of the present application will also compare and analyze the ambient air parameters and the preset parameters to determine the air parameter anomaly flag. Among them, this air parameter anomaly flag can be used to prove whether there is dirt blockage in the duct; finally, the embodiments of the present application will comprehensively judge the blockage state of the duct according to the fan parameter attenuation flag and the air parameter anomaly flag.

[0113] It should be noted that the method for obtaining the above initial fan parameters can be through on-site measurement after the fresh air system is installed and the air duct is unblocked. For example, the user can measure the initial fan parameters after installing the fresh air system at home and before formal use; in addition, it can also be that the user measures the initial fan parameters after using the system for a period of time and after cleaning the air duct; in addition, it can also be obtained by the system through pre-setting. For example, the system calculates the initial fan parameters of the air supply fan at the target wind speed level based on the bending state, length, and aperture of the air duct. In addition, it can also be obtained through other means, and the embodiments of the present application do not make specific limitations on this.

[0114] In addition, it should be noted that regarding the above-mentioned fan parameter attenuation flag, generally, it includes at least two types of characters. One type of character is used to represent that it is inferred that there is dirt blockage in the air duct, and the other type of character is used to represent that it is inferred that there is no dirt blockage in the air duct.

[0115] In addition, it should be noted that regarding the above-mentioned air parameter abnormality flag, generally, it includes at least two types of characters. One type of character is used to represent that it is inferred that there is dirt blockage in the air duct, and the other type of character is used to represent that it is inferred that there is no dirt blockage in the air duct.

[0116] It can be understood that regarding the type of the above initial fan parameters, it can be the power parameter of the air supply fan, or the current parameter of the air supply fan, or other parameters, and the embodiments of the present application do not make specific limitations on this.

[0117] In addition, as Figure 4 shown, Figure 4 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application; regarding the obtaining of the initial fan parameters corresponding to the target wind speed level in the above step S310, it can include but is not limited to step S410 and step S420.

[0118] Step S410: When the fan parameters of the air supply fan are zero, control the air supply fan to operate at the target wind speed level and continue to operate for a first duration;

[0119] Step S420: Take the fan parameters after the first duration as the initial fan parameters.

[0120] In one embodiment, when it is necessary to measure the initial fan parameters on-site, the wind speed level of the air supply fan can be set to the target wind speed level, and when the initial fan parameters are equal to zero, that is, when the initial fan parameters are not recorded, continue to operate for a first duration, and record the fan parameters after the first duration as the initial fan parameters.

[0121] It can be understood that the above-mentioned first duration can be preset, and the embodiments of the present application do not specifically limit the value of the first duration.

[0122] In addition, as Figure 5 shown, Figure 5 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application; regarding the determination of the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the initial fan parameters in the above step S310, it may include but is not limited to step S510 and step S520.

[0123] Step S510: Determine the fan parameter threshold according to the initial fan parameters and the preset down-regulation parameters;

[0124] Step S520: Determine the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the fan parameter threshold.

[0125] In one embodiment, after obtaining the initial fan parameters, the embodiments of the present application calculate the fan parameter threshold based on the preset down-regulation parameters, then compare the current fan parameters with the fan parameter threshold to obtain a comparison result, and finally determine the fan parameter attenuation flag based on this comparison result.

[0126] It should be noted that since the fan parameter threshold is obtained by down-regulating the initial fan parameters, the fan parameter threshold is less than the initial fan parameters.

[0127] In addition, it should be noted that regarding the above-mentioned preset down-regulation parameters, they can be specific amplitudes, such as a 50-watt power reduction; or they can be specific ratios, such as a 10% power reduction. The embodiments of the present application do not specifically limit the type and value of the preset down-regulation parameters.

[0128] In addition, as Figure 6 shown, Figure 6 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application; regarding the determination of the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the fan parameter threshold in the above step S520, it may include but is not limited to step S610, step S620, and step S630.

[0129] Step S610: Obtain the duration when the current fan parameters are less than the fan parameter threshold;

[0130] Step S620: When the current fan parameters are less than the fan parameter threshold continuously or cumulatively reach the second duration, set the fan parameter attenuation flag to the first character, where the first character is used to characterize the degree of fan parameter attenuation;

[0131] Step S630: When the current fan parameter is less than the fan parameter threshold and does not continuously and cumulatively reach the second duration, set the fan parameter attenuation flag to the second character, where the second character is used to represent the degree of fan parameter attenuation, and the degree of fan parameter attenuation corresponding to the second character is less than the degree of fan parameter attenuation corresponding to the first character.

[0132] In an embodiment, if the current fan parameter can continuously or cumulatively be less than the fan parameter threshold for the second duration, it can be considered that the attenuation amount of the fan parameter is large, and at this time, the fan parameter attenuation flag will be set to the first character; if the current fan parameter does not continuously and cumulatively reach less than the fan parameter threshold for the second duration, it can be considered that the attenuation amount of the fan parameter is small, and at this time, the fan parameter attenuation flag will be set to the second character.

[0133] It should be noted that regarding the types of the above-mentioned first character and second character, they can be numbers. For example, the first character can be 1 and the second character can be 0; they can also be letters. For example, the first character can be a and the second character can be b; they can also be other forms of characters, and the embodiments of the present application do not make specific limitations on this.

[0134] It can be understood that regarding the above-mentioned second duration, it can be preset, and the embodiments of the present application do not make specific limitations on the value of the second duration.

[0135] In addition, as Figure 7 shown, Figure 7 is a flowchart of an air duct blockage recognition method provided by another embodiment of the present application; when the environmental air parameter includes the room air parameter, regarding determining the air parameter anomaly flag according to the environmental air parameter and the preset parameter in the above step S320, it may include but is not limited to step S710 and step S720.

[0136] Step S710: Control the supply air fan to operate at the target wind speed level for the third duration, and obtain the parameter change amount of the room air parameter before and after the third duration;

[0137] Step S720: Determine the air parameter anomaly flag according to the parameter change amount and the preset parameter.

[0138] In an embodiment, the embodiments of the present application will control the supply air fan to operate at the target wind speed level for the third duration. Then, after the third duration, the embodiments of the present application will obtain the parameter change amount of the room air parameter. Then, the parameter change amount and the preset parameter will be compared to obtain a comparison result. Finally, the air parameter anomaly flag will be determined according to the comparison result.

[0139] It can be understood that the above-mentioned third duration can be preset, and the embodiments of the present application do not specifically limit the value of the third duration.

[0140] It can be understood that the above-mentioned preset parameter can be preset, and the embodiments of the present application do not specifically limit the value of the preset parameter.

[0141] In addition, as Figure 8 shown, Figure 8 FIG. is a flowchart of a method for identifying a duct blockage provided by another embodiment of the present application; determining an air parameter anomaly flag according to a parameter change amount and a preset parameter in the above-mentioned step S720 may include, but is not limited to, step S810, step S820, and step S830.

[0142] Step S810: Compare the parameter change amount with the preset change amount;

[0143] Step S820: When the parameter change amount is less than the preset change amount, set the air parameter anomaly flag to a third character, where the third character is used to indicate that the ambient air parameter does not meet the qualified condition;

[0144] Step S830: When the parameter change amount is greater than or equal to the preset change amount, set the air parameter anomaly flag to a fourth character, where the fourth character is used to indicate that the ambient air parameter meets the qualified condition.

[0145] In one embodiment, if the parameter change amount is less than the preset change amount, it can be considered that there may be a duct blockage, then at this time the air parameter anomaly flag will be the third character; if the parameter change amount is greater than or equal to the preset change amount, it can be considered that there may be no duct blockage, and at this time the air parameter anomaly flag will be set to the fourth character.

[0146] It should be noted that the types of the above-mentioned third character and fourth character can be numbers. For example, the third character can be 1 and the fourth character can be 0; they can also be letters. For example, the third character can be a and the fourth character can be b; they can also be other forms of characters, and the embodiments of the present application do not specifically limit this.

[0147] It can be understood that the third character and the first character can be the same. For example, both the third character and the first character are 1; the fourth character and the second character can be the same. For example, both the fourth character and the second character are 0.

[0148] It can be understood that the above-mentioned preset change amount can be preset, and the embodiments of the present application do not specifically limit the value of the preset change amount.

[0149] It should be noted that regarding the above environmental air parameters, they can be room temperature parameters, room humidity parameters, or other types of parameters. The embodiments of the present application do not make specific limitations in this regard.

[0150] In addition, as Figure 9 shown, Figure 9 is a flowchart of a duct blockage identification method provided by another embodiment of the present application; in the case where the environmental air parameters include fresh air parameters and supply air parameters, regarding determining the air parameter anomaly flag according to the environmental air parameters and preset parameters in the above step S320, it may include but is not limited to steps S910 and S920.

[0151] Step S910: Determine the parameter difference between the fresh air parameter and the supply air parameter;

[0152] Step S920: Determine the air parameter anomaly flag according to the parameter difference and the preset parameter.

[0153] In one embodiment, the embodiments of the present application will compare the fresh air parameter and the supply air parameter to obtain the parameter difference between the two. Then, the parameter change amount is compared with the preset parameter to obtain a comparison result. Finally, the air parameter anomaly flag is determined according to the comparison result.

[0154] It can be understood that regarding the above preset parameter, it can be preset, and the embodiments of the present application do not make specific limitations on the value of the preset parameter.

[0155] In addition, it should be noted that regarding determining the air parameter anomaly flag according to the parameter difference and the preset parameter in the above step S920, it may include but is not limited to Figure 10 or Figure 11 two implementation cases, which are specifically as follows:

[0156] As Figure 10 shown, Figure 10 is a flowchart of a duct blockage identification method provided by another embodiment of the present application; regarding the above step S920, it may include but is not limited to steps S1010, S1020, and S1030.

[0157] Step S1010: Determine that the fresh air system is in the cooling mode;

[0158] Step S1020: When the parameter difference is less than the first preset difference and lasts for the fourth time period, set the air parameter anomaly flag to the third character, where the third character is used to indicate that the environmental air parameter does not meet the qualified condition;

[0159] Step S1030: When the parameter difference does not remain less than the first preset difference for a fourth duration, set the air parameter anomaly flag to the fourth character, where the fourth character is used to indicate that the ambient air parameters meet the qualified conditions.

[0160] In one embodiment, in the cooling mode, the indoor heat exchanger is the evaporator and the outdoor heat exchanger is the condenser. At this time, if the parameter difference between the fresh air parameter and the supply air parameter can continuously or cumulatively be less than the first preset difference for a fourth duration, it can be considered that there may be a duct blockage. Then, the air parameter anomaly flag will be set to the third character at this time; if the parameter difference between the fresh air parameter and the supply air parameter does not continuously and cumulatively remain less than the first preset difference for a fourth duration, it can be considered that there may be no duct blockage, and the air parameter anomaly flag will be set to the fourth character at this time.

[0161] It should be noted that in the cooling mode, the parameter difference can be the difference between the fresh air moisture content and the supply air moisture content, or the difference between the fresh air enthalpy value and the supply air enthalpy value, or other parameters. The embodiments of the present application do not make specific limitations on this.

[0162] In addition, it can be understood that the above-mentioned fourth duration can be preset, and the embodiments of the present application do not make specific limitations on the value of the fourth duration.

[0163] As Figure 11 shown, Figure 11 is a flowchart of a duct blockage identification method provided by another embodiment of the present application; regarding the above step S920, it may include but is not limited to steps S1110, S1120, and S1130.

[0164] Step S1110: Determine that the fresh air system is in the heating mode;

[0165] Step S1120: When the parameter difference is greater than the second preset difference and lasts for a fifth duration, set the air parameter anomaly flag to the third character;

[0166] Step S1130: When the parameter difference does not remain greater than the second preset difference for a fifth duration, set the air parameter anomaly flag to the fourth character.

[0167] In one embodiment, in the heating mode, the indoor heat exchanger is the condenser and the outdoor heat exchanger is the evaporator. At this time, if the parameter difference between the fresh air parameter and the supply air parameter can continuously or cumulatively be greater than the second preset difference for a fifth duration, it can be considered that there may be a duct blockage. Then, the air parameter anomaly flag will be set to the third character at this time; if the parameter difference between the fresh air parameter and the supply air parameter does not continuously and cumulatively remain greater than the second preset difference for a fifth duration, it can be considered that there may be no duct blockage, and the air parameter anomaly flag will be set to the fourth character at this time.

[0168] It should be noted that in the heating mode, the parameter difference can be the difference between the fresh air enthalpy value and the supply air enthalpy value, or other parameters, and the embodiments of the present application do not make specific limitations thereto.

[0169] In addition, it can be understood that the above-mentioned fifth duration can be preset, and the embodiments of the present application do not make specific limitations on the value of the fifth duration.

[0170] In addition, as Figure 12 shown, Figure 12 is a flowchart of a duct blockage identification method provided by another embodiment of the present application; regarding determining the blockage state of the duct according to the fan parameter decay flag and the air parameter anomaly flag in the above step S330, it may include but is not limited to step S1210, step S1220, and step S1230.

[0171] Step S1210: Obtain the fan parameter decay flag and the air parameter anomaly flag;

[0172] Step S1220: When the fan parameter decay flag is the first character and the air parameter anomaly flag is the third character, determine that there is a blockage in the duct;

[0173] Step S1230: When the fan parameter decay flag is the second character or the air parameter anomaly flag is the fourth character, determine that there is no blockage in the duct.

[0174] In one embodiment, if both the fan parameter decay flag and the coil parameter change trend flag are used to characterize that it is deduced that there is a dirty blockage in the duct, then the embodiments of the present application will determine that there is a blockage in the duct at this time; if at least one of the fan parameter decay flag and the coil parameter change trend flag characterizes that it is deduced that there is no dirty blockage in the duct, then the embodiments of the present application will determine that there is no blockage in the duct at this time.

[0175] Based on the duct blockage identification methods of the above various embodiments, the overall embodiments of the duct blockage identification method of the present application are respectively proposed below.

[0176] As Figure 13 shown, Figure 13 is a flowchart of comprehensive judgment of duct dirty blockage provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0177] Step S1310: Start;

[0178] Step S1320: Obtain the initial power;

[0179] Step S1330: Analyze the power decay amount;

[0180] Step S1340: Room temperature and humidity analysis;

[0181] Step S1350: Based on the comprehensive power attenuation, room temperature and humidity, determine whether the air duct is blocked;

[0182] Step S1360: End.

[0183] Specifically, in step S1320, obtain the initial powers Pa, Pb, Pc, and Pd at the high air volume level. Then, in step S1330, analyze by combining the current power P of the supply air fan with the corresponding initial power at different air volumes to obtain the power attenuation flag status. In step S1340, further analyze the room temperature and humidity to obtain the flag indicating that the temperature is not reached but the humidity is reached. Then, based on the above flags, determine whether the air duct is blocked.

[0184] As Figure 14 shown, Figure 14 is the flowchart of the comprehensive judgment of air duct blockage provided by another embodiment of the present application; this process includes but is not limited to the following steps:

[0185] Step S1410: Start;

[0186] Step S1420: Obtain the initial power;

[0187] Step S1430: Analyze the power attenuation amount;

[0188] Step S1440: Analyze the enthalpy / moisture content of fresh air and supply air;

[0189] Step S1450: Based on the comprehensive power attenuation, fresh air and supply air moisture content / enthalpy analysis, determine whether the air duct is blocked;

[0190] Step S1460: End.

[0191] Specifically, in step S1420, obtain the initial powers Pa, Pb, Pc, and Pd at the high air volume level. Then, in step S1430, analyze by combining the current power P of the supply air fan with the corresponding initial power at different air volumes to obtain the power attenuation flag status. In step S1440, further analyze the fresh air and supply air enthalpy / moisture content to obtain the flag indicating abnormal moisture content and enthalpy value. Then, based on the above flags, determine whether the air duct is blocked.

[0192] As Figure 15 shown, Figure 15 is the flowchart of obtaining the initial power provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0193] Step S1510: Start;

[0194] Step S1521: Determine whether the target wind speed is equal to A, the corresponding initial power Pa is equal to 0, and it has been continuously operating for t1 time? If so, execute Step S1522; otherwise, execute Step S1531;

[0195] Step S1522: Record the wind turbine power at time t1 as Pa;

[0196] Step S1531: Determine whether the target wind speed is equal to B, the corresponding initial power Pb is equal to 0, and it has been continuously operating for t1 time? If so, execute Step S1532; otherwise, execute Step S1541;

[0197] Step S1532: Record the wind turbine power at time t1 as Pb;

[0198] Step S1541: Determine whether the target wind speed is equal to C, the corresponding initial power Pc is equal to 0, and it has been continuously operating for t1 time? If so, execute Step S1542; otherwise, execute Step S1551;

[0199] Step S1542: Record the wind turbine power at time t1 as Pc;

[0200] Step S1551: Determine whether the target wind speed is equal to D, the corresponding initial power Pd is equal to 0, and it has been continuously operating for t1 time? If so, execute Step S1552; otherwise, execute Step S1560;

[0201] Step S1552: Record the wind turbine power at time t1 as Pd;

[0202] Step S1560: End.

[0203] Specifically, when the target wind speed level is equal to A and Pa is equal to 0 (i.e., this parameter has not been recorded), when it has been continuously operating until time t1, that is, the analysis result of Step S1521 is "yes", then record the wind turbine power at time t1 as Pa according to Step S1522. Similarly, obtain the parameter values of Pb, Pc, and Pd according to the remaining processes respectively.

[0204] As Figure 16 shown, Figure 16 is a flowchart of power attenuation analysis provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0205] Step S1610: Start;

[0206] Step S1620: Determine whether the target wind speed is equal to A, the current power P < Pa * K, and it has been continuously operating for t2 or the cumulative operation time is t3? If so, execute Step S1660; otherwise, execute Step S1630;

[0207] Step S1630: Determine whether the target wind speed is equal to B, and the current power P < Pb * K, and it has been continuously operating for t2 or the cumulative operation time is t3? If yes, execute Step S1660; otherwise, execute Step S1640;

[0208] Step S1640: Determine whether the target wind speed is equal to C, and the current power P < Pc * K, and it has been continuously operating for t2 or the cumulative operation time is t3? If yes, execute Step S1660; otherwise, execute Step S1650;

[0209] Step S1650: Determine whether the target wind speed is equal to D, and the current power P < Pd * K, and it has been continuously operating for t2 or the cumulative operation time is t3? If yes, execute Step S1660; otherwise, execute Step S1670;

[0210] Step S1660: Set the power attenuation flag to 1;

[0211] Step S1670: Set the power attenuation flag to 0;

[0212] Step S1680: End.

[0213] Specifically, when the target wind speed level is equal to A, and the current power P is less than Pa multiplied by the attenuation ratio K (where K < 1), and it has been continuously operating until t2 or the cumulative operation time is t3, that is, the analysis result in Step S1620 is "yes", then in Step S1660, the power attenuation flag is marked as 1; otherwise, the power attenuation flag is marked as 0. Similarly, analyze the attenuation of the air volume at the air volume levels of B, C, and D according to the remaining processes respectively. If the attenuation of one of the high air volume amounts meets the preset value, the power attenuation flag is marked as 1; otherwise, the power attenuation flag is marked as 0.

[0214] As Figure 17 shown, Figure 17 is the flowchart of the temperature and humidity reaching analysis provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0215] Step S1710: Start;

[0216] Step S1720: After continuously operating for t4, determine whether the room has not reached the temperature and humidity? If yes, execute Step S1730; otherwise, execute Step S1740;

[0217] Step S1730: Set the not reaching temperature and humidity flag to 1;

[0218] Step S1740: Clear the not reaching temperature and humidity flag to 0;

[0219] Step S1750: End.

[0220] Specifically, Figure 17 isFigure 13 For the further description of step S1340, when analyzing the room environment at a high target air volume, if the change in room temperature or humidity is small after the whole machine has been continuously operating for time t4, that is, the judgment result in step S1720 is "yes", then in step S1730, the flag of not reaching the temperature and humidity is set to 1; otherwise, in step S1740, the flag of not reaching the temperature and humidity is set to 0.

[0221] As Figure 18 shown, Figure 18 is a flowchart of moisture content and enthalpy value analysis provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0222] Step S1810, start;

[0223] Step S1820, obtain the moisture content Dt / enthalpy value Ht of the supply air and the moisture content Dn / enthalpy value Hn of the fresh air;

[0224] Step S1830, calculate the difference ΔD between the moisture content of the fresh air and the supply air, and the difference ΔH between the enthalpy value of the fresh air and the supply air;

[0225] Step S1840, determine whether it is a cooling mode. If so, execute step S1850; otherwise, execute step S1870;

[0226] Step S1850, determine whether it satisfies that the moisture content difference ΔD < Dc and lasts for time tc, or the enthalpy difference ΔH < Hc and lasts for time tc? If so, execute step S1861; otherwise, execute step S1862;

[0227] Step S1861, set the moisture content and enthalpy value anomaly flag to 1;

[0228] Step S1862, clear the moisture content and enthalpy value anomaly flag to 0;

[0229] Step S1870, determine whether it is a heating mode. If so, execute step S1881; otherwise, execute step S1882;

[0230] Step S1881, determine whether it satisfies that the enthalpy difference ΔH > Hh and lasts for time th. If so, execute step S1861;

[0231] Step S1882, clear the moisture content and enthalpy value anomaly flag to 0;

[0232] Step S1890, end.

[0233] Specifically, Figure 18 is Figure 14Further description of step S1440: In step S1820, obtain the moisture content Dt and enthalpy value Ht of the supply air, and the moisture content Dn and enthalpy value Hn of the fresh air. In step S1830, calculate the moisture content difference ΔD between the fresh air and the supply air and the enthalpy difference ΔH between the fresh air and the supply air. In the high target air volume of the cooling mode, combined with the change in the operating frequency increase, if the moisture content difference ΔD is less than Dc and lasts for tc time, or the enthalpy difference ΔH is less than Hc and lasts for tc time, that is, the analysis result in step S1850 is "yes", then mark the moisture content and enthalpy value anomaly flag as 1 in step S1861, otherwise mark the moisture content and enthalpy value anomaly flag as 0 in step S1862. In the heating mode, combined with the change in the operating frequency increase, if the enthalpy difference ΔH is greater than Hh and lasts for th time, that is, the analysis result in step S1881 is "yes", then mark the moisture content and enthalpy value anomaly flag as 1 in step S1861, otherwise mark the moisture content and enthalpy value anomaly flag as 0 in step S1882.

[0234] As Figure 19 shown, Figure 19 is the comprehensive analysis flow chart of the air duct blockage provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0235] Step S1910, start;

[0236] Step S1920, determine whether it satisfies that the power attenuation amount flag is 1 and the temperature and humidity reaching flag is 1. If yes, execute step S1930, otherwise execute step S1940;

[0237] Step S1930, set the air duct blockage flag to 1;

[0238] Step S1940, clear the air duct blockage flag to 0;

[0239] Step S1950, end.

[0240] As Figure 20 shown, Figure 20 is the comprehensive analysis flow chart of the air duct blockage provided by another embodiment of the present application; this process includes but is not limited to the following steps:

[0241] Step S2010, start;

[0242] Step S2020, determine whether it satisfies that the power attenuation amount flag is 1 and the moisture content and enthalpy value anomaly flag is 1. If yes, execute step S2030, otherwise execute step S2040;

[0243] Step S2030, set the air duct blockage flag to 1;

[0244] Step S2040, clear the air duct blockage flag to 0;

[0245] Step S2050, end.

[0246] For Figure 19 , if both the power attenuation flag and the temperature and humidity not reached flag are 1, that is, the judgment results in step S1920 are all "yes", it indicates that the air duct is blocked; otherwise, the air duct is not blocked. For Figure 20 , if both the power attenuation flag and the moisture content and enthalpy value abnormality flag are 1, that is, the judgment results in step S2020 are all "yes", it indicates that the air duct is blocked; otherwise, the air duct is not blocked.

[0247] Based on the air duct blockage identification methods of the above various embodiments, an overall solution is proposed:

[0248] After the fresh air humidifying and dehumidifying machine is installed, after detecting the static pressure of the corresponding air duct according to the working environment, set the static pressure levels of the supply air fan and the exhaust air fan through the human-machine interface, and the software will clear the initial powers Pa, Pb, Pc, and Pd to zero. When the supply air fan runs at high air volumes with wind speed levels A, B, C, and D respectively, process according to the running power and duration of the fan to obtain the corresponding initial powers Pa, Pb, Pc, and Pd respectively. After completing the corresponding initial power records, the software will then detect the power attenuation situation at each corresponding wind speed level in real time. If the ratio of the current power to the original power shows a large attenuation, it is used as a preliminary judgment result of air duct blockage. Further, at a high target air volume, if the change in room temperature or humidity is small over a long time in the room, or in the cooling external circulation, it is detected that the difference in moisture content / enthalpy difference between the fresh air and the supply air is not obvious, or in the cooling internal circulation, it is detected that the difference in moisture content / enthalpy difference between the return air and the supply air is not obvious, it is finally determined that the air duct is blocked.

[0249] Based on the air duct blockage identification methods of the above various embodiments, the following will respectively present various embodiments of the controller, fresh air system, and computer-readable storage medium of the present application.

[0250] As Figure 21 shown, Figure 21 is a schematic structural diagram of a controller for executing the air duct blockage identification method provided by an embodiment of the present application. The controller 600 implemented in the present application includes: a processor 610, a memory 620, and a computer program stored on the memory 620 and executable on the processor 610. Among them, Figure 21 one processor 610 and one memory 620 are taken as an example.

[0251] The processor 610 and the memory 620 can be connected through a bus or other means, Figure 21 Taking the connection through the bus as an example.

[0252] The memory 620, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 620 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 620 may optionally include a memory 620 that is remotely located relative to the processor 610, and these remote memories 620 can be connected to the controller 600 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0253] Those skilled in the art can understand that Figure 21 the device structure shown in

[0254] In Figure 21 the controller 600 shown, the processor 610 can be used to call the air duct blockage recognition program stored in the memory 620, so as to implement the above-mentioned air duct blockage recognition method. Specifically, the non-transitory software programs and instructions required to implement the air duct blockage recognition method of the above embodiments are stored in the memory 620, and when executed by the processor 610, the air duct blockage recognition method of the above embodiments is executed.

[0255] It should be noted that since the controller 600 of the embodiments of the present application can execute the air duct blockage recognition method of any of the above embodiments, therefore, the specific implementation manners and technical effects of the controller 600 of the embodiments of the present application can refer to the specific implementation manners and technical effects of the air duct blockage recognition method of any of the above embodiments.

[0256] In addition, an embodiment of the present application also provides a fresh air system, and the fresh air system includes the controller of the above embodiment.

[0257] It should be noted that since the fresh air system of the embodiments of the present application includes the controller of the above embodiment, and the controller of the above embodiment can execute the air duct blockage recognition method of any of the above embodiments, therefore, the specific implementation manners and technical effects of the fresh air system of the embodiments of the present application can refer to the specific implementation manners and technical effects of the air duct blockage recognition method of any of the above embodiments.

[0258] In addition, an embodiment of the present application also provides a computer-readable storage medium, and the computer-readable storage medium stores computer-executable instructions for executing the above-mentioned air duct blockage recognition method. Exemplarily, execute the Figures 2 to 20 method steps in the above description.

[0259] It should be noted that since the computer-readable storage medium of the embodiments of the present application can execute the air duct blockage recognition method of any of the above embodiments, therefore, for the specific implementation manners and technical effects of the computer-readable storage medium of the embodiments of the present application, reference may be made to the specific implementation manners and technical effects of the air duct blockage recognition method of any of the above embodiments.

[0260] Those of ordinary skill in the art can understand that all or some of the steps and systems disclosed in the above methods can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. The computer storage medium includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium generally includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0261] The above has specifically described the preferred embodiments of the present application, but the present application is not limited to the above implementation manners. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A method for identifying a blocked air duct, characterized in that, it is applied to a fresh air system, the fresh air system includes a supply air fan and a heat pump cycle device, the heat pump cycle device includes an indoor heat exchanger and an outdoor heat exchanger, the indoor heat exchanger and the outdoor heat exchanger are connected through a refrigerant pipeline, and the supply air fan and the indoor heat exchanger are used to be installed in the air duct; The method for identifying a blocked air duct includes: Controlling the supply air fan to operate at a target wind speed level; Obtaining the current fan parameters of the supply air fan and environmental air parameters; Determining the blocked state of the air duct according to the current fan parameters and the environmental air parameters.

2. The method for identifying a blocked air duct according to claim 1, characterized in that, The determining the blocked state of the air duct according to the current fan parameters and the environmental air parameters includes: Obtaining initial fan parameters corresponding to the target wind speed level, and determining a fan parameter attenuation flag of the supply air fan according to the current fan parameters and the initial fan parameters; Determining an air parameter anomaly flag according to the environmental air parameters and preset parameters; Determining the blocked state of the air duct according to the fan parameter attenuation flag and the air parameter anomaly flag.

3. The method for identifying a blocked air duct according to claim 2, characterized in that, The obtaining the initial fan parameters corresponding to the target wind speed level includes: When the fan parameters of the supply air fan are zero, controlling the supply air fan to operate at the target wind speed level and continuously operate for a first duration, and taking the fan parameters after the first duration as the initial fan parameters.

4. The method for identifying a blocked air duct according to claim 2, characterized in that, The determining the fan parameter attenuation flag of the supply air fan according to the current fan parameters and the initial fan parameters includes: Determining a fan parameter threshold according to the initial fan parameters and a preset down-regulation parameter; Determining the fan parameter attenuation flag of the supply air fan according to the current fan parameters and the fan parameter threshold.

5. The method for identifying a blocked air duct according to claim 4, characterized in that, The determining the fan parameter attenuation flag of the supply air fan according to the current fan parameters and the fan parameter threshold includes one of the following: When the current fan parameters are less than the fan parameter threshold continuously or cumulatively reach a second duration, setting the fan parameter attenuation flag to a first character, where the first character is used to characterize the degree of fan parameter attenuation; When the current fan parameters are less than the fan parameter threshold but do not continuously and cumulatively reach the second duration, setting the fan parameter attenuation flag to a second character, where the second character is used to characterize the degree of fan parameter attenuation, and the degree of fan parameter attenuation corresponding to the second character is less than the degree of fan parameter attenuation corresponding to the first character.

6. The method for identifying a blocked air duct according to any one of claims 2 to 5, characterized in that, The current fan parameters and the initial fan parameters are power parameters or current parameters.

7. The method for identifying a blocked air duct according to claim 5, characterized in that, The environmental air parameters include room air parameters; determining an air parameter anomaly flag according to the environmental air parameters and preset parameters includes: Controlling the supply air fan to operate at a target wind speed level and continuously for a third duration, and obtaining the parameter change amount of the room air parameters before and after the third duration; Determining an air parameter anomaly flag according to the parameter change amount and preset parameters.

8. The air duct blockage identification method according to claim 7, wherein, Determining an air parameter anomaly flag according to the parameter change amount and preset parameters includes one of the following: When the parameter change amount is less than a preset change amount, setting the air parameter anomaly flag to a third character, where the third character is used to indicate that the environmental air parameters do not meet the qualified conditions; When the parameter change amount is greater than or equal to the preset change amount, setting the air parameter anomaly flag to a fourth character, where the fourth character is used to indicate that the environmental air parameters meet the qualified conditions.

9. The air duct blockage identification method according to claim 7 or 8, wherein, The environmental air parameters include room temperature parameters and / or room humidity parameters.

10. The air duct blockage identification method according to claim 5, wherein, The environmental air parameters include fresh air parameters and supply air parameters; determining an air parameter anomaly flag according to the environmental air parameters and preset parameters includes: Determining the parameter difference between the fresh air parameters and the supply air parameters; Determining an air parameter anomaly flag according to the parameter difference and preset parameters.

11. The air duct blockage identification method according to claim 10, wherein, Determining an air parameter anomaly flag according to the parameter difference and preset parameters includes one of the following: In the cooling mode, when the parameter difference is less than a first preset difference and lasts for a fourth duration, setting the air parameter anomaly flag to a third character, where the third character is used to indicate that the environmental air parameters do not meet the qualified conditions; In the cooling mode, when the parameter difference does not last for the fourth duration and remains less than the first preset difference, setting the air parameter anomaly flag to a fourth character, where the fourth character is used to indicate that the environmental air parameters meet the qualified conditions; In the heating mode, when the parameter difference is greater than a second preset difference and lasts for a fifth duration, setting the air parameter anomaly flag to a third character; In the heating mode, when the parameter difference does not last for the fifth duration and remains greater than the second preset difference, setting the air parameter anomaly flag to a fourth character.

12. The air duct blockage identification method according to claim 11, wherein: In the cooling mode, the parameter difference includes one of the following: the difference between the fresh air moisture content and the supply air moisture content, the difference between the fresh air enthalpy value and the supply air enthalpy value; In the heating mode, the parameter difference includes: the difference between the fresh air enthalpy value and the supply air enthalpy value.

13. The air duct blockage identification method according to claim 8 or 11, wherein, Determining the blockage state of the air duct according to the fan parameter attenuation flag and the air parameter anomaly flag includes one of the following: When the fan parameter attenuation flag is the first character and the air parameter abnormality flag is the third character, it is determined that there is a blockage in the air duct; When the fan parameter attenuation flag is the second character or the air parameter abnormality flag is the fourth character, it is determined that there is no blockage in the air duct.

14. A controller, Characterized in that, Comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor runs the computer program, it executes the air duct blockage identification method according to any one of claims 1 to 13.

15. A fresh air system, Characterized in that, Comprising the controller according to claim 14.

16. A computer-readable storage medium, Characterized in that: Stored with computer-executable instructions for executing the air duct blockage identification method according to any one of claims 1 to 13.

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