Control method and control device for indoor fan of air conditioner and air conditioner

Abstract

The invention provides a control method and device for an indoor fan of an air conditioner and the air conditioner. When the air conditioner operates in the refrigeration mode, the room temperature reaches the set temperature, and the frequency of frequent starting and stopping of a compressor is detected to be larger than or equal to the set frequency within the set time, it is judged that the air conditioner enters the operation stage for maintaining the room set temperature, starting and stopping of the compressor are not controlled any more, and the air conditioner operates according to the coil pipe temperatures Tz of different indoor heat exchangers. The indoor fan is controlled to rotate reversely at different rotating speeds, the air volume output by the indoor fan is smaller than the air volume output when the indoor fan rotates forwards, at the moment, the cooling capacity output by the air conditioner is smaller than the cooling capacity output by the air conditioner when the indoor fan rotates forwards, and the cooling capacity requirement when the air conditioner enters the operation stage of maintaining the room set temperature is met; and frequent starting and stopping of the compressor are avoided while room temperature fluctuation is reduced.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to a control method for an indoor fan of an air conditioner, a control device for executing the control method, and an air conditioner using the control method or having the control device. Background Technology

[0002] When an air conditioner is operating in cooling mode, the indoor fan typically runs at a higher speed until the room reaches the set temperature. At this time, the indoor fan outputs a large volume of air, which facilitates heat exchange between the indoor heat exchanger and the indoor air, allowing the room to quickly reach the set temperature. Once the room temperature reaches the set temperature, the air conditioner operates to maintain that temperature. After reaching the set temperature, the compressor frequency and indoor fan speed will decrease; however, considering factors such as bearing lubrication, the indoor fan speed cannot decrease indefinitely.

[0003] Current technology cannot make the airflow of indoor fans extremely low. Once the indoor temperature reaches the set temperature, the compressor will frequently start and stop to prevent the indoor temperature from dropping further, which will affect the compressor's lifespan. Moreover, frequent compressor start and stop may cause large fluctuations in indoor temperature, giving users a feeling of sudden changes in temperature and resulting in a poor user experience.

[0004] In addition, once the indoor temperature reaches the set temperature, even if the indoor fan runs at a low speed, the direct airflow to the user can cause the user to feel a localized "overcooling" sensation, thus reducing the user's comfort. Summary of the Invention

[0005] This application aims to provide a control method and control device for an indoor fan of an air conditioner, as well as an air conditioner using the control method or having the control device, so as to at least solve or alleviate some of the problems existing in the prior art.

[0006] This application provides a control method for an indoor fan of an air conditioner. The air conditioner to which this control method is applicable includes a compressor, an indoor heat exchanger, and an indoor fan. The control method provided by this application includes: an air conditioner operating mode determination step, determining whether the air conditioner is operating in a specified mode; a compressor operating status detection step, detecting and recording the current operating status of the compressor in real time; and an indoor heat exchanger coil temperature detection step, detecting and recording the coil temperature T of the indoor heat exchanger in real time. z The indoor return air temperature detection steps involve real-time monitoring of the indoor return air temperature T1; the indoor return air temperature comparison steps involve comparing the real-time detected indoor return air temperature T1 with the air conditioner's set target temperature T. sComparison is performed; the indoor fan reverse command generation step is based on the detection results of the compressor working status detection step and the indoor heat exchanger coil temperature T. z The comparison results of the indoor return air temperature comparison step generate an indoor fan reversal command; the indoor fan reversal command execution step, the indoor fan executes indoor fan reversal operation according to the indoor fan reversal command.

[0007] In the optional technical solution, the indoor fan reversal command generation step is based on the indoor heat exchanger coil temperature T. z The different values ​​indicate the indoor fan's reversal command, which instructs the indoor fan to reverse at different speeds.

[0008] In the optional technical solution, during the execution step of the indoor fan reversal command, when the coil temperature T of the indoor heat exchanger... z Higher than the first set temperature T0 but lower than the second set temperature T 21 When the indoor fan is turned on, it reverses to run at the first set speed; when the coil temperature T of the indoor heat exchanger... z Higher than the second set temperature T 21 But it is below the third set temperature T 22 When the indoor fan is turned on, it reverses to run at the second set speed; when the coil temperature T of the indoor heat exchanger... z Higher than the third set temperature T 22 However, when the temperature is below the fourth set temperature T2, the indoor fan is controlled to reverse and run at the third set speed.

[0009] In the optional technical solution, the first set speed is less than the second set speed, which is less than the third set speed.

[0010] In the optional technical solution, the first set temperature T0 is a fixed preset value; the fourth set temperature T2 is the indoor return air temperature T1 being less than or equal to the air conditioner's set target temperature T. S At that time, the coil temperature Tz of the indoor heat exchanger.

[0011] In the optional technical solution, the second set temperature T 21 With the third set temperature T 22 It is obtained by interpolation between the first set temperature T0 and the fourth set temperature T2.

[0012] In the optional technical solutions, the specified mode is that the air conditioner operates in cooling mode.

[0013] The optional technical solution also includes an electrostatic dust removal mode operation step, and an indoor fan reversal command generation step. After generating the indoor fan reversal command, the electrostatic dust removal mode is run.

[0014] The optional technical solution also includes a step for the indoor fan to exit the reverse command, when the indoor return air temperature T1 is close to the air conditioner's set target temperature T. S Satisfying the numerical relation T1-T S When n ≥ n, the indoor fan is instructed to stop reversing, where n is a fixed preset value.

[0015] Another aspect of this application provides a control device for an indoor air conditioner fan, comprising: an air conditioner operation mode determination module for determining whether the air conditioner is operating in a specified mode; a compressor operating status detection module for real-time detection and recording of the compressor's current operating status; and an indoor heat exchanger coil temperature detection module for real-time detection and recording of the indoor heat exchanger coil temperature T. z The indoor return air temperature detection module monitors the indoor return air temperature T1 in real time; the indoor return air temperature comparison module compares the real-time detected indoor return air temperature T1 with the air conditioner's set target temperature T. S A comparison is performed; the indoor fan reverse command generation module, based on the comparison results from the compressor operating status detection module and the indoor heat exchanger coil temperature T, performs a comparison. z The comparison results from the indoor return air temperature comparison module generate an indoor fan reversal command; the indoor fan reversal command execution module executes the indoor fan to reverse operation according to the indoor fan reversal command.

[0016] In another aspect of this application, an air conditioner is provided, including a memory and a control device, wherein the control device performs the control method for the indoor fan of the air conditioner according to any of the above claims. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the execution steps of a control method for an indoor air conditioning fan in one embodiment of this application.

[0018] Figure 2 This is a schematic diagram of an air conditioner module in one embodiment of this application.

[0019] Figure 3 This is a schematic diagram illustrating the execution steps of a control method for an indoor air conditioning fan in one embodiment of this application.

[0020] Figure 4 This is a schematic diagram illustrating the execution steps of a control method for an indoor air conditioning fan in one embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the control device module for the indoor fan of an air conditioner in one embodiment of this application.

[0022] Reference numerals: Compressor 1; Indoor heat exchanger 2; Indoor fan 3; Memory 4; Control device 5; Air conditioner operation mode judgment module 51; Indoor return air temperature detection module 52; Indoor return air temperature comparison module 53; Compressor working status detection module 54; Indoor heat exchanger coil temperature detection module 55; Indoor fan reverse command generation module 56; Indoor fan reverse command execution module 57. Detailed Implementation

[0023] It should be noted that the following will use examples to illustrate the working principle, features and advantages of the refrigeration equipment according to this application. However, it should be understood that all descriptions are given for illustrative purposes only and should not be construed as limiting the application in any way.

[0024] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.

[0025] <First Implementation Method>

[0026] Figure 1 This is a schematic diagram illustrating the execution steps of a control method for an indoor air conditioning fan in one embodiment of this application. (See attached diagram.) Figure 1 As shown, the control method for the indoor fan of an air conditioner involved in this embodiment includes: air conditioner operation mode determination step S1; indoor return air temperature detection step S2; indoor return air temperature comparison step S3; compressor working status detection step S4; indoor heat exchanger coil temperature detection step S5; indoor fan reverse command generation step S6; indoor fan reverse command execution step S7.

[0027] Figure 2 This is a schematic diagram of an air conditioner module in one embodiment of this application. (See attached diagram.) Figure 2 As shown, the air conditioner 101 involved in this embodiment includes: compressor 1, indoor heat exchanger 2, indoor fan 3, memory 4, and control device 5.

[0028] In this embodiment, when the air conditioner 101 is turned on, the air conditioner operation mode determination step S1 is executed to detect the current operation mode of the air conditioner 101. If it is detected that the air conditioner 101 is operating in cooling mode, the indoor return air temperature detection step S2 is executed to detect the indoor return air temperature T1 in real time. After obtaining the indoor return air temperature T1, the indoor return air temperature comparison step S3 is executed to compare the real-time detected indoor return air temperature T1 with the air conditioner's set target temperature T. SA comparison is performed. When the indoor return air temperature T1 is less than or equal to the air conditioner's set target temperature T... S At the same time, execute compressor operating status detection step S4 to detect and record the current operating status of compressor 1 in real time. Execute indoor heat exchanger coil temperature detection step S5 to detect and record the coil temperature T of indoor heat exchanger 2 in real time. z Based on the comparison results of the indoor return air temperature comparison step S3 and the current operating status of compressor 1 obtained in real time from the compressor operating status detection step S4, the current operating condition of air conditioner 101 is determined.

[0029] When it is determined that the air conditioner 101 has entered the operation stage of maintaining the indoor set temperature, the indoor fan reverse command generation step S6 is executed, based on the detection result of the compressor working status detection step S4 and the coil temperature T of the indoor heat exchanger 2. z The comparison results of indoor return air temperature comparison step S3 are used to generate an indoor fan reversal command; after the indoor fan reversal command is generated, the indoor fan reversal command execution step S7 is executed to control the indoor fan 3 to reverse its operation according to the indoor fan reversal command.

[0030] Specifically, when the comparison result of the indoor return air temperature comparison step S3 is that the indoor return air temperature T1 is less than or equal to the air conditioner's set target temperature T... S Furthermore, if the compressor operating status detection step S4 detects that the compressor 1 starts and stops frequently within a set time, reaching or exceeding the set number of times, for example, if the compressor 1 starts and stops twice or more within half an hour, then it is determined that the air conditioner 101 has entered the operation stage of maintaining the indoor set temperature, and the indoor fan reverse command generation step S6 and the indoor fan reverse command execution step S7 are executed. Thus, based on the detection results of the compressor operating status detection step S4 and the coil temperature T of the indoor heat exchanger 2... z Based on the comparison results of step S3 (comparison of indoor return air temperature), the indoor fan 3 is controlled to reverse.

[0031] Generally speaking, the air volume output by indoor fan 3 when it is running in reverse is significantly less than the minimum air volume when indoor fan 3 is running in forward rotation. When air conditioner 101 enters the operation stage of maintaining the indoor set temperature, while maintaining compressor 1 at the lowest frequency, it is not necessary to frequently start and stop compressor 1. Instead, by controlling indoor fan 3 to run in reverse, the air volume output by indoor fan 3 is greatly less than the air volume when running in forward rotation. That is, when indoor fan 3 is running in reverse, the cooling capacity output by air conditioner 101 is significantly less than the cooling capacity output by air conditioner 101 when indoor fan 3 is running in forward rotation at minimum speed.

[0032] In this way, when the air conditioner 101 enters the operation phase of maintaining the indoor set temperature, the compressor 1 is controlled to continue working at the minimum frequency, while the indoor fan 3 reverses to reduce the cooling output of the air conditioner 101, thus avoiding the situation where the indoor return air temperature T1 is less than or equal to the air conditioner's set target temperature T. S When compressor 1 needs to stop running to reduce cooling output, and factors such as indoor lighting, electrical appliances, and human body heat cause the indoor return air temperature T1 to rise, exceeding the air conditioner's set target temperature T... S When this happens, compressor 1 needs to be restarted, which causes compressor 1 to start and stop frequently, affecting the service life of compressor 1.

[0033] In the embodiments of this application, when the indoor return air temperature T1, i.e., the indoor ambient temperature, is less than or equal to the air conditioner's set target temperature T... S At the same time, by controlling the indoor fan 3 to reverse, the air conditioner 101 can continue to output cooling capacity with a smaller amount while controlling the compressor 1 to continue running. This avoids the problem of large fluctuations in indoor temperature that may be caused by frequent start-stop of the compressor 1, which would affect the user experience.

[0034] Meanwhile, when the indoor return air temperature T1, i.e. the indoor ambient temperature, is low, the indoor fan 3 may cause users to feel localized overcooling when it rotates in the forward direction. By controlling the indoor fan 3 to run in reverse, the problem of low-temperature air blowing directly on users and affecting the comfort of the air conditioner 101 is avoided.

[0035] Although the present application's implementation method uses the comparison result of the indoor return air temperature comparison step S3 and the compressor operating status detection step S4 to detect that the compressor 1 has frequently started and stopped within a set time, thereby comprehensively determining that the air conditioner 101 has entered the operation stage of maintaining the indoor set temperature, the present application is not limited to this. Any setting that determines the air conditioner 101 to enter the operation stage of maintaining the indoor set temperature based solely on the comparison result of the indoor return air temperature comparison step S3, or solely on the operating condition of the compressor 1, or comprehensively on other parameters, should be included within the scope of protection of the present application.

[0036] Meanwhile, in this embodiment, the indoor return air temperature T1, i.e., the indoor ambient temperature, is less than or equal to the air conditioner's set target temperature T. S An example was given to illustrate this. However, it is not limited to this; the indoor return air temperature T1 and the air conditioner's set target temperature T... S When the difference between the two reaches a specified threshold, such as a specified threshold of 1.0℃ or 0.5℃, the indoor fan reverse command generation step S6 and the indoor fan reverse command execution step S7 are executed, which also fall within the protection scope of this application.

[0037] Alternatively, the time-varying curve of the indoor return air temperature T1 can be used to predict the arrival time of the air conditioner's set target temperature T. S The timing of the indoor fan reversal command generation step S6 and the indoor fan reversal command execution step S7 are also within the scope of protection of this application.

[0038] <Second Implementation Method>

[0039] The control method for the indoor fan of the air conditioner in the second embodiment of this application is the same as the control method for the indoor fan of the air conditioner in the above-mentioned embodiments of this application. The same names or symbols are used to describe the same content, and will not be repeated here.

[0040] The control method for the indoor air conditioner fan provided in the second embodiment of this application differs from the control method for the indoor air conditioner fan provided in the first embodiment in that, in the indoor fan reversal command generation step S6, the control method is based on the coil temperature T of the indoor heat exchanger 2. z The different speeds of the indoor fan 3 will generate a reverse instruction to instruct the indoor fan 3 to reverse at different speeds.

[0041] Considering the coil temperature T of indoor heat exchanger 2 z At different times, the cooling capacity output of air conditioner 101 will also be different. In order to further meet the cooling capacity required when air conditioner 101 enters the operation stage of maintaining the room set temperature, and to avoid excessive cooling capacity output causing the indoor return air temperature T1 to continue to drop, it is set that when the indoor return air temperature T1 is less than or equal to the set target temperature T of air conditioner 101... S At that time, the coil temperature T of indoor heat exchanger 2 z The fourth set temperature T2 is set, and the first set temperature T0 is set to a fixed preset value, such as 0°C. The second set temperature T is obtained by interpolation between the first set temperature T0 and the fourth set temperature T2. 21 With the third set temperature T 22 The first set temperature T0 is lower than the second set temperature T. 21 Below the third set temperature T 22 Below the fourth set temperature T2.

[0042] In a preferred embodiment of this application, when the coil temperature T of the indoor heat exchanger 2... z Higher than the first set temperature T0 but lower than the second set temperature T 21 When the indoor fan 3 is reversed at the first set speed, the indoor heat exchanger 2 coil temperature T is controlled to rotate in reverse. z Higher than the second set temperature T 21 But it is below the third set temperature T 22 When the indoor fan 3 is reversed and runs at the second set speed, the indoor heat exchanger 2 coil temperature T... zHigher than the third set temperature T 22 However, when the temperature is below the fourth set temperature T2, the indoor fan 3 is controlled to reverse and run at the third set speed.

[0043] The reverse rotation speed of the indoor fan 3 can be flexibly set according to different operating conditions of the air conditioner 101, compressor 1, and evaporator. Any setting that controls the cooling output of the air conditioner 101 to meet the cooling requirements for maintaining the set indoor temperature should be included within the scope of protection of this application. Preferably, in this embodiment, the first set rotation speed is less than the second set rotation speed, which is less than the third set rotation speed.

[0044] In the above manner, when it is determined that the air conditioner 101 has entered the operation stage of maintaining the indoor set temperature, the indoor heat exchanger coil temperature T obtained in real time from the indoor heat exchanger coil temperature detection step S5 is used. z With the first set temperature T0 and the second set temperature T 21 Third set temperature T 22 The fourth set temperature T2 is compared. If the comparison result is the coil temperature T of the indoor heat exchanger 2, then... z Higher than the first set temperature T0 but lower than the second set temperature T 21 At this time, the temperature of the indoor heat exchanger 2 is extremely low, and only a very small air volume is needed to meet the cooling demand of the air conditioner 101 during the operation phase of maintaining the room set temperature. Therefore, the indoor fan 3 is controlled to reverse and run at the first set speed.

[0045] If the comparison result is the coil temperature T of indoor heat exchanger 2 z Higher than the second set temperature T 21 But it is below the third set temperature T 22 At this time, the temperature of the indoor heat exchanger 2 is relatively low, and the air volume required is slightly greater than the air volume output by the indoor fan 3 when it reverses at the first set speed to meet the cooling demand of the air conditioner 101 during the operation phase of maintaining the room set temperature. Therefore, at this time, the indoor fan 3 is controlled to reverse at the second set speed.

[0046] If the comparison result is the coil temperature T of indoor heat exchanger 2 z Higher than the third set temperature T 22 However, if the temperature is lower than the fourth set temperature T2, the temperature of the indoor heat exchanger 2 is higher, requiring a larger output air volume to meet the cooling demand of the air conditioner 101 during the operation phase of maintaining the room set temperature. Therefore, the indoor fan 3 is controlled to reverse and run at the third set speed.

[0047] According to the coil temperature T of different indoor heat exchangers 2 z The indoor fan 3 is controlled to run in reverse at different speeds, taking into full account the coil temperature T of the indoor heat exchanger 2. zAt different times, the different amounts of cooling output from air conditioner 101 prevent the coil temperature T of indoor heat exchanger 2 from changing. z At extremely low temperatures, the indoor fan 3 is still controlled to run in reverse at a relatively high speed, resulting in a large output air volume and cooling capacity. The indoor return air temperature T1 continues to decrease, or the coil temperature T of the indoor heat exchanger 2... z When the temperature is high, the indoor fan 3 is controlled to run in reverse at a lower speed, resulting in a smaller output air volume and cooling capacity, which cannot meet the indoor cooling load. This causes the indoor return air temperature T1, i.e. the indoor ambient temperature, to rise, affecting the user's thermal comfort.

[0048] Although a fixed preset value is used as the first set temperature T0 in this embodiment, this application is not limited to this. Different first set temperatures T0 can be set according to different operating conditions of the air conditioner 101, different ambient temperature and humidity conditions in the area where the air conditioner 101 is located, etc., and all of these should be included in the protection scope of this application.

[0049] Furthermore, although in this embodiment the second set temperature T is obtained by interpolation between the first set temperature T0 and the fourth set temperature T2, 21 With the third set temperature T 22 However, this application is not limited to this; the second set temperature T can also be obtained through other methods, such as equal division. 21 With the third set temperature T 22 The settings should also be included within the scope of protection of this application.

[0050] <Third Implementation Method>

[0051] The control method for the indoor fan of the air conditioner in the third embodiment of this application, which uses the same name or symbols as the control method for the indoor fan of the air conditioner in the above embodiments of this application, is the same content and will not be repeated here.

[0052] Figure 3 This is a schematic diagram illustrating the execution steps of a control method for an indoor air conditioning fan in one embodiment of this application. (See attached diagram.) Figure 3 As shown, the control method for the indoor fan of the air conditioner involved in this embodiment also includes: electrostatic dust removal mode operation step S8.

[0053] When the indoor fan 3 rotates forward, the air drawn into the air conditioner 101 may contain dust and other impurities. These impurities are then filtered through a filter, causing them to adhere to the inside of the air conditioner 101, preventing the air blown out by the air conditioner 101 from carrying dust and other impurities and affecting the user experience. When the indoor fan 3 rotates in reverse, to prevent the dust adhering to the inside of the air conditioner 101 from being carried out of the air conditioner 101, the electrostatic dust removal mode operation step S8 is executed. This occurs after the indoor fan reverse command is generated in step S6.

[0054] In this way, when the indoor fan 3 reverses, it runs in electrostatic dust removal mode. The electrostatic field ionizes the gas, causing the dust and other impurities brought out by the indoor fan 3 to become charged and adsorbed onto the electrodes. This avoids the problem of the indoor fan 3 blowing the dust adsorbed inside the filter or air conditioner 101 into the room when it reverses, thus affecting the user experience.

[0055] Although this embodiment uses electrostatic dust removal to prevent the indoor fan 3 from reversing and blowing dust into the room, this application is not limited to this. Any other dust removal method should be included within the scope of protection of this application.

[0056] <Fourth Implementation Method>

[0057] The control method for the indoor fan of the air conditioner in the fourth embodiment of this application, which uses the same name or symbols as the control method for the indoor fan of the air conditioner in the above embodiments of this application, is the same content and will not be repeated here.

[0058] Figure 4 This is a schematic diagram illustrating the execution steps of a control method for an indoor air conditioning fan in one embodiment of this application. (See attached diagram.) Figure 4 As shown, the control method for the indoor fan of the air conditioner involved in this embodiment also includes: step S9, where the indoor fan exits the reverse command.

[0059] Considering that changes in factors such as internal and external disturbances may increase the room's cooling load, the indoor return air temperature T1 is set to be close to the air conditioner's set target temperature T. S Satisfying the numerical relation T1-T S When n is greater than or equal to n, the indoor fan exits reverse command step S9 is executed, which commands the indoor fan 3 to exit reverse. Preferably, n is a fixed preset value.

[0060] When the air conditioner 101 is operating to maintain the set indoor temperature, the indoor fan 3 is controlled to reverse. At this time, the air conditioner 101 outputs a smaller cooling capacity, sufficient to maintain the set indoor temperature, avoiding excessive or insufficient cooling output that could significantly impact the indoor temperature and reduce user thermal comfort. This is achieved by setting the indoor return air temperature T1 relative to the air conditioner's set target temperature T... S Satisfying the numerical relation T1-T S When the value is ≥n, the indoor fan exits reverse command step S9 is executed, instructing the indoor fan 3 to exit reverse. This avoids the problem that the air conditioner 101 cannot adjust its operating mode in time when the room's cooling load increases due to changes in factors such as internal and external disturbances, thus reducing indoor thermal comfort and optimizing the user experience.

[0061] Depending on the model and power of different air conditioners 101, different values ​​of n can be flexibly set. As long as the setting can quickly change the operating mode of the air conditioner 101 when the indoor cooling load changes, and avoid the indoor ambient temperature from rising and affecting indoor thermal comfort, it is included within the scope of protection of this application. Preferably, in this embodiment, n is 2°C.

[0062] <Fifth Implementation Method>

[0063] The fifth embodiment of this application provides a control device for an indoor air conditioner fan. In this embodiment, the same names or symbols are used to describe the control method of the indoor air conditioner fan in the above embodiments of this application. They are all the same content and will not be described again here.

[0064] Figure 5 This is a schematic diagram of the control device module for the indoor fan of an air conditioner in one embodiment of this application, as shown below. Figure 5 As shown, the control device 5 for the indoor fan of the air conditioner involved in this embodiment includes: an air conditioner operation mode judgment module 51; an indoor return air temperature detection module 52; an indoor return air temperature comparison module 53; a compressor working status detection module 54; an indoor heat exchanger coil temperature detection module 55; an indoor fan reverse command generation module 56; and an indoor fan reverse command execution module 57.

[0065] In this embodiment, when the air conditioner 101 is turned on, the air conditioner operation mode determination module 51 detects the current operation mode of the air conditioner 101. If it detects that the air conditioner 101 is operating in cooling mode, the indoor return air temperature detection module 52 detects the indoor return air temperature T1 in real time. After obtaining the indoor return air temperature T1, the indoor return air temperature comparison module 53 compares the real-time detected indoor return air temperature T1 with the air conditioner's set target temperature T. S Compare them.

[0066] Meanwhile, the compressor operating status detection module 54 detects and records the current operating status of compressor 1 in real time. The indoor heat exchanger coil temperature detection module 55 detects and records the coil temperature T of indoor heat exchanger 2 in real time. z Then, by combining the comparison results of the indoor return air temperature comparison module 53 and the current operating status of the compressor 1 detected in real time by the compressor operating status detection module 54, the current operating stage of the air conditioner 101 is determined.

[0067] When it is determined that the air conditioner 101 has entered the operation phase of maintaining the indoor set temperature, the indoor fan reverse command generation module 56 generates the command based on the detection results of the compressor working status detection module 54 and the coil temperature T of the indoor heat exchanger. zThe comparison results of the indoor return air temperature comparison module 53 and the indoor fan reverse command are used to generate an indoor fan reverse command. After the indoor fan reverse command is generated, the indoor fan reverse command execution module 57 controls the indoor fan 3 to reverse its operation according to the indoor fan reverse command.

[0068] Specifically, in this embodiment, the air conditioner operation mode determination module 51 controls the execution of the air conditioner operation mode determination step S1 in any one of the first to fourth embodiments; similarly, the indoor return air temperature detection module 52 controls the execution of the indoor return air temperature detection step S2; the indoor return air temperature comparison module 53 controls the execution of the indoor return air temperature comparison step S3; the compressor operating status detection module 54 controls the execution of the compressor operating status detection step S4; the indoor heat exchanger coil temperature detection module 55 controls the execution of the indoor heat exchanger coil temperature detection step S5; the indoor fan reverse command generation module 56 controls the execution of the indoor fan reverse command generation step S6; and the indoor fan reverse command execution module 57 controls the execution of the indoor fan reverse command execution step S7.

[0069] In this application embodiment, an air conditioner 101 is also provided, including a memory 4 and a control device 5, wherein the control device 5 executes any of the above-described control methods for the indoor fan of an air conditioner.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for controlling an indoor fan of an air conditioner, wherein the air conditioner includes a compressor, an indoor heat exchanger, and an indoor fan, characterized in that, include, The air conditioner operating mode determination step determines whether the air conditioner is operating in a specified mode. Indoor return air temperature detection steps, real-time detection of indoor return air temperature T1; The indoor return air temperature comparison step involves comparing the real-time detected indoor return air temperature T1 with the air conditioner's set target temperature T. S Perform a comparison; The compressor operating status detection step involves real-time detection and recording of the current operating status of the compressor. The indoor heat exchanger coil temperature detection procedure involves real-time detection and recording of the indoor heat exchanger coil temperature T. z ; The indoor fan reversal command generation step generates an indoor fan reversal command based on the detection results of the compressor working status detection step, the coil temperature Tz of the indoor heat exchanger, and the comparison results of the indoor return air temperature comparison step. The indoor fan reverse command execution step involves the indoor fan reversing operation according to the indoor fan reverse command.

2. The control method for an indoor air conditioning fan as described in claim 1, characterized in that, In the step of generating the indoor fan reverse command, the temperature T of the indoor heat exchanger coil is used as the basis. z The different values ​​of the indoor fan speed will generate a reverse command that instructs the indoor fan to reverse at different speeds.

3. The control method for an indoor air conditioning fan as described in claim 2, characterized in that, In the step of executing the indoor fan reverse command, When the coil temperature Tz of the indoor heat exchanger is higher than the first set temperature T0 but lower than the second set temperature T 21 At that time, the indoor fan is controlled to reverse and run at a first set speed; When the coil temperature Tz of the indoor heat exchanger is higher than the second set temperature T 21 But it is below the third set temperature T 22 At that time, the indoor fan is controlled to reverse and run at a second set speed; When the coil temperature Tz of the indoor heat exchanger is higher than the third set temperature T 22 However, when the temperature is below the fourth set temperature T2, the indoor fan is controlled to reverse and run at the third set speed.

4. The control method for an indoor air conditioning fan as described in claim 3, characterized in that, The first set speed is less than the second set speed, which is less than the third set speed.

5. The control method for an indoor air conditioning fan as described in claim 4, characterized in that, The first set temperature T0 is a fixed preset value; The fourth set temperature T2 is defined as the indoor return air temperature T1 being less than or equal to the air conditioner's set target temperature T. S At that time, the coil temperature T of the indoor heat exchanger z .

6. The control method for an indoor air conditioning fan as described in claim 5, characterized in that, The second set temperature T 21 With the third set temperature T 22 This is obtained by interpolation between the first set temperature T0 and the fourth set temperature T2.

7. The control method for an indoor air conditioning fan as described in claim 1, characterized in that, The specified mode is that the air conditioner operates in cooling mode.

8. The control method for an indoor air conditioning fan as described in claim 7, characterized in that, It also includes an electrostatic dust removal mode operation step, wherein after the indoor fan reverse command generation step generates the indoor fan reverse command, the electrostatic dust removal mode is run.

9. The control method for an indoor air conditioning fan as described in claim 8, characterized in that, It also includes, The indoor fan exits the reverse command step when the indoor return air temperature T1 is close to the air conditioner's set target temperature T. S Satisfying the numerical relation T1-T S When n ≥ n, the indoor fan is instructed to exit reverse rotation. Where n is a fixed preset value.

10. A control device for an indoor fan of an air conditioner, characterized in that, include, An air conditioner operation mode determination module determines whether the air conditioner is operating in a specified mode. The compressor operating status detection module detects and records the current operating status of the compressor in real time. The indoor heat exchanger coil temperature detection module detects and records the coil temperature T of the indoor heat exchanger in real time. z ; Indoor return air temperature detection module, which detects the indoor return air temperature T1 in real time; The indoor return air temperature comparison module compares the real-time detected indoor return air temperature T1 with the air conditioner's set target temperature T. S Perform a comparison; The indoor fan reverse command generation module generates commands based on the comparison results from the compressor operating status detection module and the coil temperature T of the indoor heat exchanger. z The comparison results from the indoor return air temperature comparison module generate an indoor fan reversal command. The indoor fan reverse command execution module executes the indoor fan to reverse operation according to the indoor fan reverse command.

11. An air conditioner, comprising a memory and a control device, characterized in that, The control device performs the control method for the indoor fan of the air conditioner as described in any one of claims 1-9.

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