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 an air supply fan is controlled to operate at a target air speed grade; the current fan parameter of the air supply fan and the current coil pipe parameter of the heat pump circulating device are obtained; and determining the blockage state of the air duct according to the current fan parameters and the current coil pipe parameters. Due to the fact that fan parameters of the air supply fan and coil pipe parameters of the heat pump circulating device 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 coil pipe 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 a blocked air duct, 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 an internal heat exchanger and then filtered through a filter screen and conveyed to the room. Since dust accumulates on the surface of the filter screen after long-term use, in order to avoid a reduction in 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 a blocked air duct, a controller, a fresh air system, and a storage medium, aiming to detect the blocked state of the air duct in a timely manner 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 a blocked air duct, 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 a blocked air duct 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 current coil parameters of the heat pump cycle device;

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

[0009] According to some embodiments of the present application, the determining the blocked state of the air duct according to the current fan parameters and the current coil 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 coil parameter change trend flag according to the current coil parameters and preset parameters;

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

[0013] According to some embodiments of the present application, the obtaining 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 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 the 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 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 determining the coil parameter change trend flag according to the current coil parameters and preset parameters includes:

[0023] Obtain the current operating mode of the fresh air system;

[0024] When the current operating mode is the external circulation mode, obtain fresh air parameters;

[0025] When the fresh air parameters reach a preset condition, determine the coil parameter change trend flag according to the current coil parameters and preset parameters.

[0026] According to some embodiments of the present application, the preset condition includes one of the following:

[0027] In the cooling mode, the preset condition is that the fresh air parameter is greater than a first preset value;

[0028] In the heating mode, the preset condition is that the fresh air parameter is less than a second preset value.

[0029] According to some embodiments of the present application, the fresh air parameter includes fresh air temperature or fresh air enthalpy value.

[0030] According to some embodiments of the present application, the current coil parameters include the indoor coil parameters of the indoor heat exchanger; the determining the coil parameter change trend flag according to the current coil parameters and preset parameters includes one of the following:

[0031] In the cooling mode, when the indoor coil parameter is less than a first preset parameter for a continuous or cumulative third duration, set the coil parameter change trend flag to a third character;

[0032] In the cooling mode, when the indoor coil parameter is less than the first preset parameter but not continuously and cumulatively for the third duration, set the coil parameter change trend flag to a fourth character;

[0033] In the heating mode, when the indoor coil parameter is greater than a second preset parameter for a continuous or cumulative third duration, set the coil parameter change trend flag to a third character;

[0034] In the heating mode, when the indoor coil parameter is greater than the second preset parameter but not continuously or cumulatively for the third duration, set the coil parameter change trend flag to a fourth character.

[0035] According to some embodiments of the present application, the indoor coil parameter includes indoor coil pressure or indoor coil temperature.

[0036] According to some embodiments of the present application, the current coil parameters include the indoor coil parameters of the indoor heat exchanger and the outdoor coil parameters of the outdoor heat exchanger; the determining the coil parameter change trend flag according to the current coil parameters and preset parameters includes one of the following:

[0037] In the cooling mode, when the ratio of the indoor coil parameter to the outdoor coil parameter is greater than a preset ratio and lasts for a fourth duration, set the coil parameter change trend flag to the third character;

[0038] In the cooling mode, when the ratio of the indoor coil parameter to the outdoor coil parameter is greater than a preset ratio but does not last for a fourth duration, set the coil parameter change trend flag to the fourth character;

[0039] In the heating mode, when the ratio of the outdoor coil parameter to the indoor coil parameter is greater than a preset ratio and lasts for a fourth duration, set the coil parameter change trend flag to the third character;

[0040] In the heating mode, when the ratio of the outdoor coil parameter to the indoor coil parameter is greater than a preset ratio but does not last for a fourth duration, set the coil parameter change trend flag to the fourth character.

[0041] According to some embodiments of the present application, in the cooling mode, the indoor coil parameter is the evaporation pressure or the evaporation temperature, and the outdoor coil parameter is the condensation pressure or the condensation temperature;

[0042] In the heating mode, the indoor coil parameter is the condensation pressure or the condensation temperature, and the outdoor coil parameter is the evaporation pressure or the evaporation temperature.

[0043] According to some embodiments of the present application, determining the clogging state of the air duct according to the fan parameter decay flag and the coil parameter change trend flag includes one of the following:

[0044] When the fan parameter decay flag is the first character and the coil parameter change trend flag is the third character, determine that there is a clog in the air duct;

[0045] When the fan parameter decay flag is the second character or the coil parameter change trend flag is the fourth character, determine that there is no clog in the air duct.

[0046] 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. When the processor runs the computer program, it executes the air duct clogging recognition method in the first aspect as described above.

[0047] 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.

[0048] 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 clogging recognition method in the first aspect as described above.

[0049] 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 current coil parameters of the heat pump cycle device; then, the embodiment of the present application determines the blockage state of the air duct according to the current fan parameters and the current coil parameters. Since the blockage of the air duct will affect the fan parameters of the air supply fan and the coil parameters of the heat pump cycle device, therefore, the embodiment of the present application can comprehensively analyze the blockage state of the air duct according to the fan parameters and the coil parameters when the air supply fan operates at the same speed. Even before the filter screen 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 screen in advance, thereby improving the energy efficiency of the whole machine.

[0050] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] 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.

[0052] Figure 1 is a schematic structural diagram of a fresh air system provided by an embodiment of the present application;

[0053] Figure 2 is a flowchart of a method for identifying air duct blockage provided by an embodiment of the present application;

[0054] Figure 3 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0055] Figure 4 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0056] Figure 5 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0057] Figure 6 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0058] Figure 7 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0059] Figure 8It is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0060] Figure 9 It is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0061] Figure 10 It is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0062] Figure 11 It is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0063] Figure 12 It is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application;

[0064] Figure 13 It is a flowchart of a comprehensive judgment of air duct dirt blockage provided by an embodiment of the present application;

[0065] Figure 14 It is a flowchart of obtaining an initial power provided by an embodiment of the present application;

[0066] Figure 15 It is a flowchart of power attenuation analysis provided by an embodiment of the present application;

[0067] Figure 16 It is a flowchart of coil pressure / temperature state analysis provided by an embodiment of the present application;

[0068] Figure 17 It is a flowchart of coil pressure / temperature ratio analysis provided by an embodiment of the present application;

[0069] Figure 18 It 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

[0070] 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 below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0071] In the description of the present application, it should be understood that the orientation or positional relationship involved, such as up, down, front, back, left, right, etc., indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It 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, and thus should not be construed as limiting the present application.

[0072] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, and understandings such as "above", "below", "within", etc. include the corresponding 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 indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0073] 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 meaning of the above terms in the present application in combination with the specific content of the technical solution.

[0074] In some cases, under the pressure difference generated by the rotation of the air supply 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 the internal heat exchanger, and at the same time, it will be filtered by the filter screen and then transported to the room. Since dust will accumulate 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.

[0075] 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. It may cause serious blockage of the air duct due to reasons such as a humid or dusty usage environment before the usage time limit of the filter screen is reached, resulting in a decrease in the overall machine energy efficiency.

[0076] 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.

[0077] Next, in combination with the accompanying drawings, various embodiments of the fresh air system of the present application will be further described.

[0078] As Figure 1 shown, Figure 1 is a schematic structural diagram of a fresh air system provided by an embodiment of the present application.

[0079] In one embodiment, the fresh air system includes, but is not limited to, an air supply 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 air supply fan 110 and the indoor heat exchanger 220 are used to be installed in the air duct.

[0080] It should be noted that the air duct where the air supply fan 110 and the indoor heat exchanger 220 are installed is the fresh air duct 510. Under the action of the air supply 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.

[0081] In addition, it should be noted that the embodiment of the present application can cool or heat 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.

[0082] 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.

[0083] It can be understood that regarding the type of the air supply 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 air supply fan 110.

[0084] 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.

[0085] 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 air supply 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 air supply fan 110 close to the indoors, or can be installed in other positions. The embodiment of the present application does not specifically limit this.

[0086] 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 first sensor 410. Among them, the first sensor 410 is installed on the outdoor heat exchanger 210 and is used to detect the coil parameters of the outdoor heat exchanger 210.

[0087] It should be noted that the embodiment of the present application can detect the coil pressure of the outdoor heat exchanger 210 through the first sensor 410, or can detect the coil temperature of the outdoor heat exchanger 210 through the first sensor 410, or can detect other parameters of the outdoor heat exchanger 210 through the first sensor 410. The embodiment of the present application does not specifically limit this.

[0088] In one embodiment, as Figure 1 shown, the fresh air system according to the embodiment of the present application further includes, but is not limited to, a second sensor 420, wherein the second sensor 420 is installed on the indoor heat exchanger 220 for detecting the coil parameters of the indoor heat exchanger 220.

[0089] It should be noted that in the embodiment of the present application, the coil pressure of the indoor heat exchanger 220 can be detected by the second sensor 420, the coil temperature of the indoor heat exchanger 220 can also be detected by the second sensor 420, and other parameters of the indoor heat exchanger 220 can also be detected by the second sensor 420. The embodiment of the present application does not make specific limitations on this.

[0090] In one embodiment, as Figure 1 shown, the fresh air system according to 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 air passage 520. Specifically, under the action of the return air fan 120, the return air in the room will enter the exhaust air passage 520 and be discharged to the outside through the exhaust air passage 520.

[0091] 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.

[0092] In one embodiment, as Figure 1 shown, the fresh air system according to 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 air passage 520. Specifically, in order to reduce the loss of the cooling capacity or heat of the room due to the exhaust air, the embodiment of the present application recovers the cooling capacity or heat of the air flowing through the exhaust air passage 520 through the heat recovery device 230.

[0093] Specifically, as Figure 1 shown, when the supply air fan 110 operates, 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 machine air supply outlet. Under the operating action of the return air fan 120, the indoor air is discharged from the machine air exhaust outlet to the outside. The second sensor 420 outside the room is used to detect the coil pressure / temperature of a certain part outside the room, and the first sensor 410 inside the room is used to detect the coil pressure / temperature of a certain part inside the room.

[0094] Based on the hardware structure of the fresh air system in the above various embodiments, the following are respectively presented various embodiments of the air duct blockage recognition method of the present application.

[0095] As Figure 2 shown, Figure 2 is a flowchart of an air duct blockage recognition method provided by an embodiment of the present application; this air duct blockage recognition method can be applied to the fresh air system in the above embodiments, including but not limited to steps S210, S220, and S230.

[0096] Step S210: Control the supply air fan to operate at the target wind speed level;

[0097] Step S220: Obtain the current fan parameters of the supply air fan and the current coil parameters of the heat pump cycle device;

[0098] Step S230: Determine the blockage state of the air duct according to the current fan parameters and the current coil parameters.

[0099] In one embodiment, first, in order to detect the blockage state of the air duct, the embodiment of the present application controls the supply air fan so that the supply air fan maintains and operates at the target wind speed level; then, when the supply air fan operates at the target wind speed level, the embodiment of the present application obtains the current fan parameters of the supply air fan and also obtains the current coil parameters of the heat pump cycle device; then, the embodiment of the present application determines the blockage state of the fresh air duct according to the obtained current fan parameters and current coil parameters.

[0100] 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.

[0101] 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 coil 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 coil 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.

[0102] It can be understood that regarding the number of the above target wind speed levels, it can be one or multiple, and the embodiment of the present application does not make a specific limitation on the number of target wind speed levels.

[0103] It should be noted that when the number of target wind speed levels is one, the embodiments of the present application only infer the blockage state of the air duct based on one fan parameter, with low accuracy; while when the number of target wind speed levels is multiple, the embodiments of the present application can comprehensively infer the blockage state of the air duct based on multiple fan parameters, with high accuracy.

[0104] 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 embodiments of the present application do not make specific limitations on this.

[0105] In addition, it should be noted that regarding the current coil parameters of the above heat pump cycle device, it can refer to the coil parameters of the indoor heat exchanger, for example, the coil pressure or coil temperature of the indoor heat exchanger; or it can be the coil parameters of the outdoor heat exchanger, for example, the coil pressure or coil temperature of the outdoor heat exchanger.

[0106] It is worth noting that since the blockage of the fresh air duct will affect the fan parameters of the air supply fan and the coil parameters of the heat pump cycle device, therefore, the embodiments of the present application can comprehensively analyze the blockage state of the air duct based on the fan parameters and coil parameters when the air supply fan operates at the same speed. Even before the filter reaches the service life limit, it can timely detect that there is dirt blockage in the air duct, so as to be able to remind the user to clean the air duct or filter in advance, thereby improving the energy efficiency of the whole machine.

[0107] In addition, as Figure 3 shown, Figure 3 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application; regarding determining the blockage state of the air duct according to the current fan parameters and current coil parameters in the above step S230, it may include but is not limited to step S310, step S320, and step S330.

[0108] 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;

[0109] Step S320: Determine the coil parameter change trend flag according to the current coil parameters and the preset parameters;

[0110] Step S330: Determine the blockage state of the air duct according to the fan parameter attenuation flag and the coil parameter change trend flag.

[0111] In one embodiment, for each target wind speed level, the embodiments of the present application will obtain the initial fan parameters at the target wind speed level and when the air duct is not blocked, and then compare and analyze the initial fan parameters with the current fan parameters to determine the fan parameter attenuation flag of the air supply fan. Among them, the fan parameter attenuation flag can be used to prove whether the air duct is dirty and blocked. In addition, the embodiments of the present application will also compare and analyze the current coil parameters with the preset parameters to determine the coil parameter change trend flag. Among them, the coil parameter change trend flag can be used to prove whether the air duct is dirty and blocked. Finally, the embodiments of the present application will comprehensively judge the blockage state of the air duct according to the fan parameter attenuation flag and the coil parameter change trend flag.

[0112] It should be noted that regarding the acquisition method of the above initial fan parameters, it can be obtained through on-site measurement after the fresh air system is installed and when the air duct is not blocked. For example, after the user installs the fresh air system at home and before formal use, the initial fan parameters are measured on-site. In addition, it can also be that the user measures the initial fan parameters after formal use for a period of time and after cleaning the air duct. In addition, it can also be set by the system in advance. For example, the system calculates the initial fan parameters of the air supply fan at the target wind speed level according to the bending state, length, and aperture of the air duct. In addition, it can also be obtained through other methods, and the embodiments of the present application do not make specific limitations on this.

[0113] In addition, it should be noted that regarding the above fan parameter attenuation flag, generally, it includes at least two characters. One character is used to represent that it is inferred that there is dirt and blockage in the air duct, and the other character is used to represent that it is inferred that there is no dirt and blockage in the air duct.

[0114] In addition, it should be noted that regarding the above coil parameter change trend flag, generally, it includes at least two characters. One character is used to represent that it is inferred that there is dirt and blockage in the air duct, and the other character is used to represent that it is inferred that there is no dirt and blockage in the air duct.

[0115] 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.

[0116] 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 acquisition of the initial fan parameters corresponding to the target wind speed level in the above step S310, it may include, but is not limited to, step S410 and step S420.

[0117] 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;

[0118] Step S420: Take the fan parameters after the first duration as the initial fan parameters.

[0119] In one embodiment, when it is necessary to actually measure the initial fan parameters, 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 the first duration, and record the fan parameters after the first duration as the initial fan parameters.

[0120] It can be understood that regarding the above-mentioned first duration, it can be preset, and the embodiment of the present application does not specifically limit the value of the first duration.

[0121] 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 determining 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.

[0122] Step S510: Determine the fan parameter threshold according to the initial fan parameters and the preset downward adjustment parameter;

[0123] Step S520: Determine the fan parameter attenuation flag of the air supply fan according to the current fan parameters and the fan parameter threshold.

[0124] In one embodiment, after obtaining the initial fan parameters, the embodiment of the present application calculates the fan parameter threshold based on the preset downward adjustment parameter, then compares the current fan parameters with the fan parameter threshold to obtain a comparison result, and finally determines the fan parameter attenuation flag based on the comparison result.

[0125] It should be noted that since the fan parameter threshold is obtained by downward adjusting the initial fan parameters, the fan parameter threshold is less than the initial fan parameters.

[0126] In addition, it should be noted that regarding the above-mentioned preset downward adjustment parameter, it can be a specific amplitude, such as a power reduction of 50 watts; it can also be a specific ratio, such as a power reduction of 10%, and the embodiment of the present application does not specifically limit the type and value of the preset downward adjustment parameter.

[0127] In addition, as Figure 6 shown, Figure 6It is a flowchart of a duct blockage identification method provided by another embodiment of the present application; regarding determining the fan parameter attenuation flag of the supply air fan according to the current fan parameters and the fan parameter threshold in step S520 above, it may include but is not limited to step S610, step S620, and step S630.

[0128] Step S610: Obtain the duration for which the current fan parameter is less than the fan parameter threshold.

[0129] Step S620: When the current fan parameter is less than the fan parameter threshold continuously or cumulatively reaches 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.

[0130] Step S630: When the current fan parameter is less than the fan parameter threshold but 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 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.

[0131] In one 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 the second duration and is less than the fan parameter threshold, 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.

[0132] It should be noted that regarding the types of the above 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.

[0133] It can be understood that regarding the above 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.

[0134] In addition, as Figure 7 shown, Figure 7 It is a flowchart of a duct blockage identification method provided by another embodiment of the present application; regarding determining the coil parameter change trend flag according to the current coil parameter and the preset parameter in step S320 above, it may include but is not limited to step S710, step S720, and step S730.

[0135] Step S710: Obtain the current operating mode of the fresh air system.

[0136] Step S720: When the current operating mode is the external circulation mode, obtain the fresh air parameters;

[0137] Step S730: When the fresh air parameters meet the preset conditions, determine the coil parameter change trend flag according to the current coil parameters and the preset parameters.

[0138] In one embodiment, since the air duct to be detected is the fresh air duct and the fresh air duct is only enabled in the external circulation mode, the embodiments of the present application need to first obtain the current operating mode. If the current operating mode is the external circulation mode, then the fresh air parameters of the outdoor environment will be obtained at this time. If the fresh air parameters meet the preset conditions, the coil parameter change trend flag will be determined according to the current coil parameters and the preset parameters.

[0139] It should be noted that the above fresh air parameters may refer to the fresh air temperature or the fresh air enthalpy value. Among them, the fresh air enthalpy value can be determined by the fresh air temperature and the fresh air moisture content. In addition, the fresh air parameters can also be other types of parameters, and the embodiments of the present application do not make specific limitations on this.

[0140] In one embodiment, the preset conditions include one of the following: in the cooling mode, the preset condition is that the fresh air parameters are greater than the first preset value; in the heating mode, the preset condition is that the fresh air parameters are less than the second preset value.

[0141] In addition, it should be noted that when the current coil parameters include the indoor coil parameters of the indoor heat exchanger, the determination of the coil parameter change trend flag according to the current coil parameters and the preset parameters in the above step S320 may include, but is not limited to Figure 8 Or Figure 9 Two implementation cases in, specifically as follows:

[0142] As Figure 8 Shown, Figure 8 is a flowchart of a method for identifying air duct blockage provided by another embodiment of the present application; regarding the above step S320, it may include, but is not limited to, step S810, step S820, and step S830.

[0143] Step S810: Determine that the fresh air system is in the cooling mode;

[0144] Step S820: When the indoor coil parameters are less than the first preset parameter continuously or cumulatively for the third duration, set the coil parameter change trend flag to the third character;

[0145] Step S830: When the indoor coil parameters are not less than the first preset parameter continuously and cumulatively for the third duration, set the coil parameter change trend flag to the fourth character.

[0146] In one embodiment, in the cooling mode, if the indoor coil parameters are continuously or cumulatively less than the first preset parameter for a third duration, it can be considered that there may be a duct blockage. At this time, the trend flag of the coil parameters will be marked as the third character; if the indoor coil parameters are not continuously and cumulatively less than the first preset parameter for a second duration, it can be considered that there may not be a duct blockage. At this time, the attenuation flag of the fan parameters will be set to the fourth character.

[0147] It should be noted that, regarding the types of the above-mentioned third character and fourth character, they 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. The embodiments of the present application do not make specific limitations on this.

[0148] 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.

[0149] In addition, it can be understood that regarding the above-mentioned third duration, it can be preset. The embodiments of the present application do not make specific limitations on the value of the third duration.

[0150] As Figure 9 shown, Figure 9 is a flowchart of a duct blockage identification method provided by another embodiment of the present application; regarding the above-mentioned step S320, it may include but is not limited to step S910, step S920, and step S930.

[0151] Step S910: Determine that the fresh air system is in the heating mode;

[0152] Step S920: When the indoor coil parameters are greater than the second preset parameter continuously or cumulatively for a third duration, set the trend flag of the coil parameters to the third character;

[0153] Step S930: When the indoor coil parameters are not greater than the second preset parameter continuously or cumulatively for a third duration, set the trend flag of the coil parameters to the fourth character.

[0154] In one embodiment, in the heating mode, if the indoor coil parameters are continuously or cumulatively greater than the second preset parameter for a third duration, it can be considered that there may be a duct blockage. At this time, the trend flag of the coil parameters will be marked as the third character; if the indoor coil parameters are not continuously and cumulatively greater than the second preset parameter for a third duration, it can be considered that there may not be a duct blockage. At this time, the trend flag of the coil parameters will be set to the fourth character.

[0155] It should be noted that regarding the above indoor coil parameters, they can be the indoor coil pressure, the indoor coil temperature, or other types of parameters. The embodiments of the present application do not make specific limitations in this regard.

[0156] In addition, it should be noted that in the case where the current coil parameters include the indoor coil parameters of the indoor heat exchanger and the outdoor coil parameters of the outdoor heat exchanger, regarding determining the coil parameter change trend flag according to the current coil parameters and the preset parameters in the above step S320, it may include but is not limited to Figure 10 or Figure 11 two implementation cases as follows:

[0157] 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 S320, it may include but is not limited to step S1010, step S1020, and step S1030.

[0158] Step S1010: Determine that the fresh air system is in the cooling mode;

[0159] Step S1020: When the ratio of the indoor coil parameters to the outdoor coil parameters is greater than the preset ratio and lasts for the fourth duration, set the coil parameter change trend flag to the third character;

[0160] Step S1030: When the ratio of the indoor coil parameters to the outdoor coil parameters is greater than the preset ratio but does not last for the fourth duration, set the coil parameter change trend flag to the fourth character.

[0161] In one embodiment, in the cooling mode, the indoor heat exchanger is an evaporator and the outdoor heat exchanger is a condenser. At this time, the embodiments of the present application will calculate the ratio of the coil parameters of the evaporator to the coil parameters of the condenser. If this ratio can continuously or cumulatively be greater than the preset ratio for the fourth duration, it can be considered that there may be a duct blockage. Then, at this time, the coil parameter change trend flag will be the third character; if this ratio cannot continuously and cumulatively be greater than the preset ratio for the fourth duration, it can be considered that there may not be a duct blockage. At this time, the coil parameter change trend flag will be set to the fourth character.

[0162] It should be noted that in the cooling mode, the indoor coil parameters can be the evaporation pressure, the evaporation temperature, or other parameters. The embodiments of the present application do not make specific limitations in this regard. In addition, the outdoor coil parameters can be the condensation pressure, the condensation temperature, or other parameters. The embodiments of the present application do not make specific limitations in this regard.

[0163] In addition, it can be understood that the fourth duration mentioned above can be preset, and the embodiments of the present application do not specifically limit the value of the fourth duration.

[0164] As Figure 11 shown, Figure 11 is a flowchart of a method for identifying a duct blockage provided by another embodiment of the present application; regarding the above step S320, it may include but is not limited to step S1110, step S1120, and step S1130.

[0165] Step S1110: Determine that the fresh air system is in the heating mode;

[0166] Step S1120: When the ratio of the outdoor coil parameter to the indoor coil parameter is greater than a preset ratio and lasts for the fourth duration, set the coil parameter change trend flag to the third character;

[0167] Step S1130: When the ratio of the outdoor coil parameter to the indoor coil parameter is greater than the preset ratio but does not last for the fourth duration, set the coil parameter change trend flag to the fourth character.

[0168] In one embodiment, in the heating mode, the indoor heat exchanger is a condenser and the outdoor heat exchanger is an evaporator. At this time, the embodiments of the present application will calculate the ratio of the coil parameter of the evaporator to the coil parameter of the condenser. If this ratio can last or accumulate for the fourth duration and is greater than the preset ratio, it can be considered that there may be a duct blockage. Then, at this time, the coil parameter change trend flag will be marked as the third character; if this ratio does not last and accumulate for the fourth duration and is greater than the preset ratio, it can be considered that there may be no duct blockage. At this time, the fan parameter attenuation flag will be set to the fourth character.

[0169] It should be noted that in the heating mode, the indoor coil parameter can be the condensation pressure, or the condensation temperature, or other parameters, and the embodiments of the present application do not specifically limit this. In addition, the outdoor coil parameter can be the evaporation pressure, or the evaporation temperature, or other parameters, and the embodiments of the present application do not specifically limit this.

[0170] In addition, as Figure 12 shown, Figure 12 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 fan parameter attenuation flag and the coil parameter change trend 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 attenuation flag and the coil parameter change trend flag;

[0172] Step S1220: When the fan parameter attenuation flag is the first character and the coil parameter change trend flag is the third character, it is determined that there is a blockage in the air duct;

[0173] Step S1230: When the fan parameter attenuation flag is the second character or the coil parameter change trend flag is the fourth character, it is determined that there is no blockage in the air duct.

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

[0175] Based on the air duct blockage identification methods of the above various embodiments, the overall embodiments of the air 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 air 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 attenuation amount;

[0180] Step S1340: Analyze the change trend of the coil pressure / temperature;

[0181] Step S1350: Determine whether the power attenuation amount flag is 1. If so, execute Step S1360; otherwise, execute Step S1380;

[0182] Step S1360: Determine whether the coil pressure / temperature change trend flag is 1. If so, execute Step S1370; otherwise, execute Step S1380;

[0183] Step S1370: Set the air duct dirty blockage flag to 1;

[0184] Step S1380: Clear the air duct dirty blockage flag to 0;

[0185] Step S1390: End.

[0186] Specifically, in step S1320, the initial powers Pa, Pb, Pc, and Pd at a high air volume level (i.e., the above-mentioned initial fan parameters) are obtained. Then, in step S1330, an analysis is performed by combining the current power P of the supply fan (i.e., the above-mentioned current fan parameters) with the corresponding initial power at different air volumes to obtain the power attenuation flag status (i.e., the above-mentioned fan parameter attenuation flag). Further, the change trends of the coil pressures Pr and temperatures T of the indoor and outdoor heat exchangers are analyzed to obtain the coil pressure / temperature flag or the coil pressure / temperature ratio flag (i.e., the above-mentioned coil parameter change trend flag).

[0187] In addition, if the coil pressure / temperature flag is 1 or the coil pressure / temperature ratio flag is 1, the coil pressure / temperature change trend flag is recorded as 1; otherwise, it is recorded as 0. On the premise that the power attenuation flag is equal to 1, if the coil pressure / temperature change trend flag is recorded as 1, that is, the judgment results of steps S1350 and S1360 are both "yes", indicating that the air duct is blocked, the air duct blockage flag is recorded as 1 in step S1370; otherwise, the air duct blockage flag is recorded as 0 in step S1380.

[0188] As Figure 14 shown Figure 14 is a flowchart for obtaining the initial power provided by an embodiment of the present application; the process includes but is not limited to the following steps:

[0189] Step S1410, start;

[0190] Step S1421, determine whether it satisfies that the target wind speed is equal to A, and the corresponding initial power Pa is equal to 0, and continue to operate for t1 time? If yes, execute step S1422; otherwise, execute step S1431;

[0191] Step S1422, record the fan power at time t1 as Pa;

[0192] Step S1431, determine whether it satisfies that the target wind speed is equal to B, and the corresponding initial power Pb is equal to 0, and continue to operate for t1 time? If yes, execute step S1432; otherwise, execute step S1441;

[0193] Step S1432, record the fan power at time t1 as Pb;

[0194] Step S1441, determine whether it satisfies that the target wind speed is equal to C, and the corresponding initial power Pc is equal to 0, and continue to operate for t1 time? If yes, execute step S1442; otherwise, execute step S1451;

[0195] Step S1442, record the fan power at time t1 as Pc;

[0196] Step S1451: 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 time t1? If yes, execute Step S1452; otherwise, execute Step S1460;

[0197] Step S1452: Record the wind turbine power at time t1 as Pd;

[0198] Step S1460: End.

[0199] 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), and when it has been continuously operating until time t1 (i.e., the analysis result in Step S1421 is "yes"), then record the wind turbine power at time t1 as Pa according to Step S1422. Similarly, obtain the parameter values of Pb, Pc, and Pd according to the remaining processes respectively.

[0200] As Figure 15 shown, Figure 15 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:

[0201] Step S1510: Start;

[0202] Step S1520: Determine whether the target wind speed is equal to A, the current power P < Pa * K, and it has been continuously operating for time t2 or the cumulative operating time is t3? If yes, execute Step S1560; otherwise, execute Step S1530;

[0203] Step S1530: Determine whether the target wind speed is equal to B, the current power P < Pb * K, and it has been continuously operating for time t2 or the cumulative operating time is t3? If yes, execute Step S1560; otherwise, execute Step S1540;

[0204] Step S1540: Determine whether the target wind speed is equal to C, the current power P < Pc * K, and it has been continuously operating for time t2 or the cumulative operating time is t3? If yes, execute Step S1560; otherwise, execute Step S1550;

[0205] Step S1550: Determine whether the target wind speed is equal to D, the current power P < Pd * K, and it has been continuously operating for time t2 or the cumulative operating time is t3? If yes, execute Step S1560; otherwise, execute Step S1570;

[0206] Step S1560: Set the power attenuation flag to 1;

[0207] Step S1570: Set the power attenuation flag to 0;

[0208] Step S1580: End.

[0209] 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 continues to run until t2 or the cumulative running time is t3, that is, the analysis result in step S1520 is "yes", then the power attenuation flag is set to 1 in step S1560; otherwise, the power attenuation amount flag is set to 0. Similarly, analyze the attenuation conditions of the air volume at the air volume levels of B, C, and D according to the remaining processes respectively. If the attenuation amount of one of the high air volumes meets the preset value, the power attenuation flag is set to 1; otherwise, the power attenuation flag is set to 0.

[0210] As Figure 16 shown, Figure 16 is the coil pressure / temperature status analysis flowchart provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0211] Step S1610, start;

[0212] Step S1620, when the operation mode is cooling and the target air volume is high? If yes, execute step S1630; otherwise, execute step S1660;

[0213] Step S1630, determine whether it meets the condition that the indoor coil pressure Pin < Pc and continues or accumulates for t4 time, or the indoor coil temperature T < Tc and continues or accumulates for t4 time? If yes, execute step S1640; otherwise, execute step S1650;

[0214] Step S1640, set the coil pressure / temperature flag to 1;

[0215] Step S1650, clear the coil pressure / temperature flag to 0;

[0216] Step S1660, when the operation mode is heating and the target air volume is high? If yes, execute step S1670; otherwise, execute step S1680;

[0217] Step S1670, determine whether it meets the condition that the indoor coil pressure Pin > Ph and continues or accumulates for t4 time, or the indoor coil temperature T > Th and continues or accumulates for t4 time? If yes, execute step S1640; otherwise, execute step S1680;

[0218] Step S1680, clear the coil pressure / temperature flag to 0;

[0219] Step S1690, end.

[0220] Specifically, when the fresh air humidifying and dehumidifying machine operates in the refrigeration mode and at a high target air volume, if it is in the external circulation at present, it is determined whether the fresh air temperature or enthalpy value is greater than Target 1 (i.e., the first preset value mentioned above). If so, that is, the judgment result in step S1620 is "yes", and further in step S1630, the relationship between the coil pressure / temperature and the preset value is analyzed. When the indoor coil pressure Pin is less than Pc and lasts or accumulates for t4 time, or the indoor coil temperature T is less than Tc and lasts or accumulates for t4 time, that is, the judgment result in step S1630 is "yes", then the coil pressure / temperature flag is marked as 1 in step S1640, otherwise the coil pressure / temperature flag is marked as 0 in step S1650. When the fresh air humidifying and dehumidifying machine operates in the heating mode and at a high target air volume, if it is in the external circulation at present, it is determined whether the fresh air temperature or enthalpy value is less than Target 2 (i.e., the second preset value mentioned above). If so, that is, the judgment result in step S1660 is "yes", and further in step S1670, the relationship between the coil pressure / temperature and the preset value is analyzed. When the indoor coil pressure Pin is greater than Ph and lasts or accumulates for t4 time, or the indoor coil temperature T is greater than Th and lasts or accumulates for t4 time, that is, the judgment result in step S1670 is "yes", then the coil pressure / temperature flag is marked as 1 in step S1640, otherwise the coil pressure / temperature flag is marked as 0 in step S1680.

[0221] As Figure 17 shown, Figure 17 is the coil pressure / temperature ratio analysis flow chart provided by an embodiment of the present application; this process includes but is not limited to the following steps:

[0222] Step S1710, start;

[0223] Step S1720, determine whether the high target air volume is satisfied, and the evaporation pressure to condensation pressure ratio > Pk and lasts for t5 time, or the evaporation temperature to condensation temperature ratio > Tk and lasts for t5 time? If so, execute step S1730, otherwise execute step S1740;

[0224] Step S1730, set the coil pressure / temperature ratio flag to 1;

[0225] Step S1740, clear the coil pressure / temperature ratio flag to 0;

[0226] Step S1750, end.

[0227] Specifically, Figure 17 shown is a further description of the analysis of the coil pressure / temperature change trend. Different from Figure 16 the method of separately processing the indoor and outdoor coils, Figure 17The process is to analyze the evaporation pressure to condensation pressure ratio / temperature ratio to detect the coil status. In the cooling mode, the indoor coil functions as the evaporator and the outdoor coil functions as the condenser. In the heating mode, the indoor coil functions as the condenser and the outdoor coil functions as the evaporator. When the evaporation pressure to condensation pressure ratio is greater than Pk and lasts for t5 time, or the evaporation temperature to condensation temperature ratio is greater than Tk and lasts for t5 time, that is, the judgment result in step S1720 is "yes", then the coil pressure / temperature ratio flag is set to 1 in step S1730, otherwise the coil pressure / temperature ratio flag is set to 0 in step S1740.

[0228] Based on the duct blockage identification methods of the above various embodiments, a whole solution is proposed below:

[0229] After the fresh air humidifier is installed, after detecting the corresponding duct static pressure according to the working environment, set the static pressure levels of the supply fan and the exhaust fan through the human-machine interface, and the software will clear the initial powers Pa, Pb, Pc, and Pd. When the supply fan operates at high air volumes with wind speed levels A, B, C, and D respectively, process according to the fan operating power and duration 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 decay situation at each corresponding wind speed level in real time. If the current power has a large decay compared to the original power, it is used as a preliminary judgment result of duct fouling and blockage; further in the cooling state, if the enthalpy values of the fresh air and the supply air are both greater than a certain preset value in the external circulation or the enthalpy values of the fresh air and the supply air are both less than a certain preset value in the internal circulation, and after continuously operating at a high target air volume for a period of time, that is, on the premise of ensuring the energy demand, if the indoor and outdoor coil pressure / temperature ratio value is relatively low, it is finally determined that there is duct fouling and blockage.

[0230] Based on the duct blockage identification methods of the above various embodiments, the respective embodiments of the controller, the fresh air system, and the computer-readable storage medium of the present application are proposed below.

[0231] As Figure 18 shown, Figure 18 is a schematic structural diagram of a controller for executing the 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 in the memory 620 and executable on the processor 610. Among them, Figure 18 one processor 610 and one memory 620 are taken as an example.

[0232] The processor 610 and the memory 620 can be connected through a bus or other means, Figure 18 Taking the connection through the bus as an example.

[0233] 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 remotely disposed 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.

[0234] Those skilled in the art can understand that Figure 18 the device structure shown in

[0235] does not constitute a limitation on the controller 600, and may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements. Figure 18 In the controller 600 shown in

[0236] , 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 program and instructions required to implement the air duct blockage recognition method of the above embodiment are stored in the memory 620, and when executed by the processor 610, the air duct blockage recognition method of the above embodiment is executed.

[0237] It should be noted that since the controller 600 of the embodiment 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 embodiment 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.

[0238] In addition, an embodiment of the present application further provides a fresh air system, and the fresh air system includes the controller of the above embodiment.

[0239] It should be noted that since the fresh air system of the embodiment 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 embodiment 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.

[0239] In addition, an embodiment of the present application further 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 method steps in Figures 2 to 17 above.

[0240] It should be noted that since the computer-readable storage medium of the embodiments of the present application can execute the air duct blockage identification 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 identification method of any of the above embodiments.

[0241] 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 non-transitory medium) and a communication medium (or 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. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk 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, communication media typically 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.

[0242] 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 the current coil parameters of the heat pump cycle device; Determining the blocked state of the air duct according to the current fan parameters and the current coil 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 current coil 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 a coil parameter change trend flag according to the current coil parameters and preset parameters; Determining the blocked state of the air duct according to the fan parameter attenuation flag and the coil parameter change trend 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 using 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 downward adjustment 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 2, characterized in that, Determining the coil parameter change trend flag according to the current coil parameters and preset parameters includes: Obtaining the current operating mode of the fresh air system; When the current operating mode is the external circulation mode, obtaining fresh air parameters; When the fresh air parameters meet the preset conditions, determining the coil parameter change trend flag according to the current coil parameters and preset parameters.

8. The air duct blockage identification method according to claim 7, wherein, The preset conditions include one of the following: In the cooling mode, the preset condition is that the fresh air parameter is greater than the first preset value; In the heating mode, the preset condition is that the fresh air parameter is less than the second preset value.

9. The air duct blockage identification method according to claim 7, wherein, The fresh air parameters include fresh air temperature or fresh air enthalpy value.

10. The air duct blockage identification method according to claim 5, wherein, The current coil parameters include the indoor coil parameters of the indoor heat exchanger; determining the coil parameter change trend flag according to the current coil parameters and preset parameters includes one of the following: In the cooling mode, when the indoor coil parameter is less than the first preset parameter for a continuous or cumulative third time period, setting the coil parameter change trend flag to the third character; In the cooling mode, when the indoor coil parameter is less than the first preset parameter but not continuously and cumulatively for the third time period, setting the coil parameter change trend flag to the fourth character; In the heating mode, when the indoor coil parameter is greater than the second preset parameter for a continuous or cumulative third time period, setting the coil parameter change trend flag to the third character; In the heating mode, when the indoor coil parameter is greater than the second preset parameter but not continuously or cumulatively for the third time period, setting the coil parameter change trend flag to the fourth character.

11. The air duct blockage identification method according to claim 10, wherein, The indoor coil parameters include indoor coil pressure or indoor coil temperature.

12. The air duct blockage identification method according to claim 5, wherein, The current coil parameters include the indoor coil parameters of the indoor heat exchanger and the outdoor coil parameters of the outdoor heat exchanger; determining the coil parameter change trend flag according to the current coil parameters and preset parameters includes one of the following: In the cooling mode, when the ratio of the indoor coil parameter to the outdoor coil parameter is greater than the preset ratio and lasts for the fourth time period, setting the coil parameter change trend flag to the third character; In the cooling mode, when the ratio of the indoor coil parameter to the outdoor coil parameter is greater than the preset ratio but does not last for the fourth time period, setting the coil parameter change trend flag to the fourth character; In the heating mode, when the ratio of the outdoor coil parameter to the indoor coil parameter is greater than the preset ratio and lasts for the fourth time period, setting the coil parameter change trend flag to the third character; In the heating mode, when the ratio of the outdoor coil parameter to the indoor coil parameter is greater than the preset ratio but does not last for the fourth time period, setting the coil parameter change trend flag to the fourth character.

13. The air duct blockage identification method according to claim 12, characterized in that: In the refrigeration mode, the indoor coil parameter is the evaporation pressure or the evaporation temperature, and the outdoor coil parameter is the condensation pressure or the condensation temperature; In the heating mode, the indoor coil parameter is the condensation pressure or the condensation temperature, and the outdoor coil parameter is the evaporation pressure or the evaporation temperature.

14. The air duct blockage identification method according to claim 10 or 12, characterized in that, determining the blockage state of the air duct according to the fan parameter attenuation flag and the coil parameter change trend flag includes one of the following: When the fan parameter attenuation flag is the first character and the coil parameter change trend 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 coil parameter change trend flag is the fourth character, it is determined that there is no blockage in the air duct.

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

16. A fresh air system, characterized in that, comprises the controller according to claim 15.

17. A computer-readable storage medium, characterized in that: stores computer-executable instructions for executing the air duct blockage identification method according to any one of claims 1 to 14.

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