Air conditioner and control method, device and computer readable storage medium thereof

Abstract

Embodiments of the present application provide an air conditioner and a control method, device and computer readable storage medium thereof. The air conditioner comprises a compressor, a reversing valve, an indoor heat exchanger and a hot gas bypass branch. The hot gas bypass branch is connected to an exhaust port of the compressor and an end of the indoor heat exchanger away from the reversing valve. A hot gas bypass electronic expansion valve is arranged on the hot gas bypass branch. The air conditioner control method comprises: in response to the air conditioner being in a cooling operation mode, determining whether a temperature difference between an indoor temperature and a set temperature is less than a first temperature difference threshold; in response to determining that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, controlling the hot gas bypass electronic expansion valve to open, and controlling an opening degree of the hot gas bypass electronic expansion valve according to a superheat degree of the indoor heat exchanger, an indoor air outlet temperature and an indoor fan speed.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, specifically to an air conditioner and its control method, device, and computer-readable storage medium. Background Technology

[0002] In related technologies, after reaching the set temperature, fixed-frequency air conditioners will shut down the compressor and only start it again when the restart conditions are met, resulting in frequent compressor start-stop cycles. Frequent compressor start-stop cycles significantly increase the air conditioner's energy consumption and cause large fluctuations in indoor temperature, leading to poor environmental comfort. Summary of the Invention

[0003] This application provides an air conditioner and its control method, device, and computer-readable storage medium, which can avoid frequent compressor start-stop and improve the comfort of using the air conditioner during cooling.

[0004] In a first aspect, embodiments of this application provide an air conditioner control method. The air conditioner includes a compressor, a reversing valve, an indoor heat exchanger, and a hot gas bypass branch. The hot gas bypass branch connects the exhaust port of the compressor to one end of the indoor heat exchanger away from the reversing valve. A hot gas bypass electronic expansion valve is provided on the hot gas bypass branch. The air conditioner control method includes: in response to the air conditioner being in a cooling operation mode, determining whether the temperature difference between the indoor temperature and the set temperature is less than a first temperature difference threshold; in response to determining that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, controlling the hot gas bypass electronic expansion valve to open, and controlling the opening degree of the hot gas bypass electronic expansion valve according to the superheat of the indoor heat exchanger, the indoor air outlet temperature, and the indoor fan speed.

[0005] In some embodiments, controlling the opening of the hot gas bypass electronic expansion valve and controlling the opening degree of the hot gas bypass electronic expansion valve according to the superheat of the indoor heat exchanger, the indoor outlet air temperature, and the indoor fan speed includes: controlling the hot gas bypass electronic expansion valve to open and operate at a first preset opening degree; after the hot gas bypass electronic expansion valve operates at the first preset opening degree for a first preset time, determining whether the superheat of the indoor heat exchanger is greater than a superheat threshold; in response to determining that the superheat of the indoor heat exchanger is greater than the superheat threshold, performing the following first operation: controlling the opening degree of the hot gas bypass electronic expansion valve to decrease to a second preset opening degree; after the hot gas bypass electronic expansion valve operates at the second preset opening degree for a second preset time, responding to Upon determining that the indoor outlet air temperature is less than or equal to a first outlet air temperature threshold and the indoor fan speed is greater than or equal to a first speed threshold, the opening of the hot gas bypass electronic expansion valve is increased to a third preset opening. In response to determining that the superheat of the indoor heat exchanger is less than the superheat threshold, the following second operation is performed: the opening of the hot gas bypass electronic expansion valve is increased to a fourth preset opening. After the hot gas bypass electronic expansion valve operates at the fourth preset opening for a third preset time, in response to determining that the indoor outlet air temperature is greater than a second outlet air temperature threshold and the indoor fan speed is less than or equal to a second speed threshold, the opening of the hot gas bypass electronic expansion valve is decreased to a fifth preset opening; the first speed threshold is greater than the second speed threshold.

[0006] In some embodiments, the first operation includes: after the hot gas bypass electronic expansion valve operates at the second preset opening for a second preset time, in response to determining that the indoor air outlet temperature is less than or equal to the first air outlet temperature threshold and the indoor fan speed is less than the first speed threshold, controlling the indoor fan speed to increase.

[0007] In some embodiments, the second operation includes: after the hot gas bypass electronic expansion valve operates at the fourth preset opening to a third preset time, in response to determining that the indoor air outlet temperature is greater than a second air outlet temperature threshold and the indoor fan speed is greater than a second speed threshold, controlling the indoor fan speed to decrease.

[0008] In some embodiments, the air conditioner control method includes: in response to determining that the temperature difference between the indoor temperature and the set temperature is greater than or equal to a first temperature difference threshold and less than or equal to a second temperature difference threshold, determining whether the indoor fan speed is greater than a first lower speed limit; in response to determining that the indoor fan speed is greater than the first lower speed limit, controlling the indoor fan speed to decrease and controlling the hot gas bypass electronic expansion valve to remain closed; in response to determining that the indoor fan speed is equal to the first lower speed limit, controlling the indoor fan speed to decrease to below the first lower speed limit, and determining whether the indoor fan speed is greater than a second lower speed limit; in response to determining that the indoor fan speed is less than or equal to the second lower speed limit, controlling the hot gas bypass electronic expansion valve to open; in response to determining that the indoor fan speed is greater than the second lower speed limit, controlling the indoor fan speed to decrease and controlling the hot gas bypass electronic expansion valve to remain closed; wherein the second lower speed limit is less than the first lower speed limit.

[0009] In some embodiments, the air conditioner control method includes: determining whether the hot gas bypass electronic expansion valve is in an open state in response to determining that the temperature difference between the indoor temperature and the set temperature is greater than a second temperature difference threshold; controlling the hot gas bypass electronic expansion valve to close in response to the hot gas bypass electronic expansion valve being in an open state; and controlling the hot gas bypass electronic expansion valve to remain closed in response to the hot gas bypass electronic expansion valve not being in an open state; wherein the first temperature difference threshold is less than the second temperature difference threshold.

[0010] Secondly, embodiments of this application provide an air conditioner control device. The air conditioner includes a compressor, a reversing valve, an indoor heat exchanger, and a hot gas bypass branch. The hot gas bypass branch connects the exhaust port of the compressor to one end of the indoor heat exchanger away from the reversing valve. A hot gas bypass electronic expansion valve is provided on the hot gas bypass branch. The air conditioner control device includes: a temperature difference comparison circuit configured to determine whether the temperature difference between the indoor temperature and the set temperature is less than a first temperature difference threshold in response to the air conditioner being in a cooling operation mode; and an opening control circuit configured to control the opening of the hot gas bypass electronic expansion valve in response to determining that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, and to control the opening degree of the hot gas bypass electronic expansion valve according to the superheat of the indoor heat exchanger, the indoor air outlet temperature, and the indoor fan speed.

[0011] Thirdly, this application provides an air conditioner, including: a compressor, a reversing valve, an indoor heat exchanger, and a hot gas bypass branch, wherein the hot gas bypass branch connects the exhaust port of the compressor and one end of the indoor heat exchanger away from the reversing valve, and a hot gas bypass electronic expansion valve is provided on the hot gas bypass branch; a memory storing a computer program; and a processor, wherein when the computer program is executed by the processor, it implements the air conditioner control method as described in any of the above embodiments.

[0012] In some embodiments, the compressor is a fixed-frequency compressor.

[0013] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the air conditioner control method described above.

[0014] The air conditioner control method provided in this application can accurately determine the time point when the compressor faces the risk of shutdown, promptly open the hot gas bypass electronic expansion valve, and accurately control the opening degree of the hot gas bypass electronic expansion valve according to the superheat of the indoor heat exchanger, the indoor air outlet temperature, and the indoor fan speed. On the one hand, it reduces the amount of cold absorbed from the outdoor side, and on the other hand, it can accurately control the flow rate and throttling state of the refrigerant supplied through the hot gas bypass branch, so as to precisely and appropriately increase the indoor load within the temperature range where the human body feels comfortable. This can avoid the compressor from shutting down due to the indoor load being too low, thus avoiding frequent compressor start-stop, and also avoid the discomfort caused by the increase in indoor load, ensuring the user's comfort. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of an air conditioner control method provided in some embodiments of this application;

[0017] Figure 2 This is a partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0018] Figure 3 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0019] Figure 4 This is another partial flowchart of an air conditioner control method provided in some embodiments of this application;

[0020] Figure 5 This is a structural diagram of an air conditioner provided in some embodiments of this application.

[0021] Explanation of key component symbols:

[0022] 1-Air conditioner, 10-Compressor, 20-Reversing valve, 30-Indoor heat exchanger, 40-Hot gas bypass branch, 41-Hot gas bypass electronic expansion valve, 42-Check valve, 50-Outdoor heat exchanger, 60-Main circuit throttling device. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0026] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0027] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0028] like Figure 1 and Figure 5 As shown, in a first aspect, embodiments of this application provide an air conditioner control method for controlling an air conditioner 1. This air conditioner control method includes steps S10 to S20, which can prevent the compressor 10 from frequently starting and stopping, thereby improving the user comfort of the air conditioner 1 during cooling.

[0029] Here, the controlled air conditioner 1 includes a compressor 10, a reversing valve 20, an indoor heat exchanger 30, and a hot gas bypass branch 40. The hot gas bypass branch 40 connects the exhaust port of the compressor 10 and the end of the indoor heat exchanger 30 away from the reversing valve 20. A hot gas bypass electronic expansion valve 41 is provided on the hot gas bypass branch 40. When the air conditioner 1 is in cooling operation mode, the end of the indoor heat exchanger 30 away from the reversing valve 20 is the refrigerant input end of the indoor heat exchanger 30, thus connecting the exhaust port of the compressor 10 and the refrigerant input end of the indoor heat exchanger 30 via the hot gas bypass branch 40. The type of compressor 10 can be determined according to actual needs, and can be, for example, a fixed-frequency compressor or a variable-frequency compressor. This application embodiment does not limit this type. In some embodiments, the compressor 10 can be a fixed-frequency compressor 10, which can only switch between start and stop states and cannot adjust the frequency.

[0030] In some examples, a check valve 42 may also be provided on the hot gas bypass branch 40. The check valve 42, also known as a one-way valve, has a one-way conduction function, which makes the hot gas bypass branch 40 conduct in one direction, so that the refrigerant can only flow from the exhaust port of the compressor 10 through the hot gas bypass branch 40 to the end of the indoor heat exchanger 30 away from the reversing valve 20, preventing the refrigerant from flowing from the end of the indoor heat exchanger 30 away from the reversing valve 20 through the hot gas bypass branch 40 to the exhaust port of the compressor 10.

[0031] S10: In response to the air conditioner 1 being in cooling operation mode, determine whether the temperature difference between the indoor temperature and the set temperature is less than a first temperature difference threshold.

[0032] Here, the indoor temperature can be determined in real time by a temperature sensor installed on the indoor side. The set temperature is the target temperature expected to be reached in the indoor environment. It can be manually input by the user or automatically generated by the air conditioner 1 based on operating conditions such as user habits and current environmental information to obtain a comfortable temperature environment. In some examples, the temperature difference between the indoor temperature and the set temperature can be the absolute value of the difference between the indoor temperature and the set temperature. A first temperature difference threshold can be preset in the control system of the air conditioner 1 to determine the similarity between the indoor temperature and the set temperature; the value of the first temperature difference threshold can be determined according to actual needs, and can be different values ​​such as 2℃, 3℃, etc., which are not limited in this embodiment.

[0033] By comparing the temperature difference between the indoor temperature and the set temperature with a first temperature difference threshold, the similarity between the indoor temperature and the set temperature can be determined. Furthermore, the indoor load of the air conditioner 1 in cooling mode can be determined based on this similarity. For example, if the temperature difference between the indoor temperature and the set temperature is greater than or equal to the first temperature difference threshold, it indicates that the indoor load of the air conditioner 1 in cooling mode is not too low, and the compressor 10 has no immediate risk of shutdown or only a minor risk of shutdown. If the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, it indicates that the indoor load of the air conditioner 1 in cooling mode is too low, and the compressor 10 may face a significant risk of shutdown.

[0034] S20: In response to the determination that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, the hot gas bypass electronic expansion valve 41 is opened, and the opening degree of the hot gas bypass electronic expansion valve 41 is controlled according to the superheat of the indoor heat exchanger 30, the indoor air outlet temperature and the indoor fan speed.

[0035] When the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, it indicates that the indoor load of the air conditioner 1 in cooling mode is too low, and the compressor 10 may face a significant risk of shutdown. At this time, the hot gas bypass electronic expansion valve 41 can be opened to direct at least part of the refrigerant discharged by the compressor 10 directly to the refrigerant input end of the indoor heat exchanger 30 via the hot gas bypass branch 40, reducing the amount of cold absorbed from the outdoor side. The opening degree of the hot gas bypass electronic expansion valve 41 can be accurately controlled according to the superheat of the indoor heat exchanger 30, the indoor air outlet temperature, and the indoor fan speed, so that the throttling effect of the hot gas bypass electronic expansion valve 41 on the refrigerant flowing through the hot gas bypass branch 40 and the refrigerant supply flow are more accurate. This allows for precise and appropriate increase of the indoor load within the temperature range where the human body feels comfortable. This can prevent the compressor 10 from shutting down due to the low indoor load, thus avoiding frequent start-stop of the compressor 10, and also prevent discomfort caused by the increase in indoor load, ensuring user comfort.

[0036] Compared with related technologies, the air conditioner control method provided in this application embodiment can accurately determine the time point when the compressor 10 faces a greater risk of shutdown, promptly open the hot gas bypass electronic expansion valve 41, and accurately control the opening degree of the hot gas bypass electronic expansion valve 41 according to the superheat of the indoor heat exchanger 30, the indoor air outlet temperature, and the indoor fan speed. On the one hand, it reduces the amount of cold absorbed from the outdoor side, and on the other hand, it can accurately control the flow rate and throttling state of the refrigerant provided through the hot gas bypass branch 40, so as to precisely and appropriately increase the indoor load within the temperature range where the human body feels comfortable. This can both prevent the compressor 10 from shutting down due to the indoor load being too low, thereby avoiding frequent start-stop of the compressor 10, and also avoid the discomfort caused by the increase in indoor load, thus ensuring the user's comfort.

[0037] like Figure 2 As shown, in some embodiments, S20 may include S21 to S24.

[0038] S21: Control the hot gas bypass electronic expansion valve 41 to open and operate at a first preset opening degree. Here, the first preset opening degree can be preset in the control system of the air conditioner 1 and can be used as the default opening degree when the hot gas bypass electronic expansion valve 41 is opened.

[0039] S22: After the hot gas bypass electronic expansion valve 41 operates at the first preset opening degree for the first preset time, determine whether the superheat of the indoor heat exchanger 30 is greater than the superheat threshold.

[0040] Here, the first preset time can be pre-set in the control system of the air conditioner 1, and can be used as the lower limit of the time length for the hot gas bypass electronic expansion valve 41 to open at the first preset degree. The superheat threshold can be pre-set in the control system of the air conditioner 1, and can be used as a judgment indicator of the superheat of the indoor heat exchanger 30.

[0041] After the hot gas bypass electronic expansion valve 41 operates at a first preset opening degree for a first preset time, it can be considered that the indoor load of the air conditioner 1 in the cooling operation mode has increased, and the risk of compressor 10 shutting down has been alleviated. At this time, it can be determined whether the superheat of the indoor heat exchanger 30 is greater than the superheat threshold, so as to determine the temperature state of the indoor heat exchanger 30 and thus judge the comfort level of the indoor environment.

[0042] S23: In response to determining that the superheat of the indoor heat exchanger 30 is greater than the superheat threshold, the following first operation can be performed, the first operation including S231 to S232.

[0043] S231: Control the opening of the hot gas bypass electronic expansion valve 41 to decrease to the second preset opening.

[0044] Here, the second preset opening degree can be preset in the control system of the air conditioner 1, and the second preset opening degree is less than the first preset opening degree. When it is determined that the superheat of the indoor heat exchanger 30 is greater than the superheat threshold, it indicates that the temperature of the indoor heat exchanger 30 is high and the cooling capacity obtained by the indoor environment is insufficient. At this time, the opening degree of the hot gas bypass electronic expansion valve 41 can be reduced to the second preset opening degree, thereby increasing the throttling effect of the hot gas bypass electronic expansion valve 41 on the refrigerant flowing through the hot gas bypass branch 40, reducing the temperature of the refrigerant supplied to the indoor heat exchanger 30 by the hot gas bypass branch 40, thereby reducing the temperature and superheat of the indoor heat exchanger 30, improving the cooling effect of the indoor heat exchanger 30 on the indoor environment, and thus making the indoor environment a cooler and more comfortable temperature environment.

[0045] S232: After the hot gas bypass electronic expansion valve 41 operates at the second preset opening degree for the second preset time, in response to determining that the indoor air outlet temperature is less than or equal to the first air outlet temperature threshold and the indoor fan speed is greater than or equal to the first speed threshold, the opening degree of the hot gas bypass electronic expansion valve 41 is controlled to increase to the third preset opening degree.

[0046] Here, the second preset time can be preset in the control system of the air conditioner 1, and can serve as the lower limit of the time for the hot gas bypass electronic expansion valve 41 to open at the second preset degree. The indoor air outlet temperature can be determined in real time by, for example, a temperature sensor installed at the indoor air outlet; the method of obtaining this temperature is not limited in this embodiment. The third preset opening degree can be preset in the control system of the air conditioner 1, and the third preset opening degree is greater than the second preset opening degree; the third preset opening degree and the first preset opening degree can be set to the same or different values; the method of obtaining this temperature is not limited in this embodiment. The first speed threshold can be preset in the control system of the air conditioner 1, and its specific value can be determined according to actual needs; the method of obtaining this speed threshold is not limited in this embodiment; for example, the first speed threshold can be set as the upper limit of the indoor fan speed.

[0047] After the hot gas bypass electronic expansion valve 41 operates at the second preset opening for the second preset time, if it is determined that the indoor air outlet temperature is less than or equal to the first air outlet temperature threshold and the indoor fan speed is greater than or equal to the first speed threshold, it indicates that the indoor air outlet temperature is too low, the indoor environment is obviously too cold, and the indoor fan speed and indoor return air volume have reached their upper limits and cannot be increased further. At this time, the opening of the hot gas bypass electronic expansion valve 41 can be increased to the third preset opening to reduce the throttling effect of the hot gas bypass electronic expansion valve 41 on the refrigerant flowing through the hot gas bypass branch 40, increase the refrigerant temperature supplied by the hot gas bypass branch 40 to the indoor heat exchanger 30, thereby increasing the temperature and superheat of the indoor heat exchanger 30, reducing the cooling effect of the indoor heat exchanger 30 on the indoor environment, so that the indoor temperature is in the comfortable range and does not produce a cold feeling.

[0048] In some examples, the first operation may include S233.

[0049] S233: After the hot gas bypass electronic expansion valve 41 operates at the second preset opening for the second preset time, in response to determining that the indoor air outlet temperature is less than or equal to the first air outlet temperature threshold and the indoor fan speed is less than the first speed threshold, the indoor fan speed is controlled to increase.

[0050] After the hot gas bypass electronic expansion valve 41 operates at the second preset opening for the second preset time, if it is determined that the indoor air outlet temperature is less than or equal to the first air outlet temperature threshold and the indoor fan speed is less than the first speed threshold, it indicates that the indoor air outlet temperature is too low and the indoor environment is obviously too cold. However, the indoor fan speed and indoor return air volume have not yet reached the upper limit. At this time, the indoor fan speed can be controlled to be further increased to a speed value that does not exceed the first speed threshold, so as to further increase the indoor return air volume and increase the indoor air outlet temperature, thereby reducing the feeling of coldness in the indoor environment and keeping the indoor temperature in a comfortable range without causing a feeling of coldness.

[0051] S24: In response to determining that the superheat of the indoor heat exchanger 30 is less than the superheat threshold, the following second operation can be performed, the second operation including S241 to S242.

[0052] S241: Increase the opening of the hot gas bypass electronic expansion valve 41 to the fourth preset opening.

[0053] Here, the fourth preset opening degree can be preset in the control system of the air conditioner 1, and the fourth preset opening degree is less than the first preset opening degree. When it is determined that the superheat of the indoor heat exchanger 30 is less than the superheat threshold, it indicates that the temperature of the indoor heat exchanger 30 is low and the cooling capacity obtained by the indoor environment is too large. At this time, the opening degree of the hot gas bypass electronic expansion valve 41 can be increased to the fourth preset opening degree, thereby reducing the throttling effect of the hot gas bypass electronic expansion valve 41 on the refrigerant flowing through the hot gas bypass branch 40, increasing the temperature of the refrigerant supplied to the indoor heat exchanger 30 by the hot gas bypass branch 40, thereby increasing the temperature and superheat of the indoor heat exchanger 30, reducing the cooling effect of the indoor heat exchanger 30 on the indoor environment, and thus keeping the indoor temperature in a comfortable range without causing a cold feeling.

[0054] S242: After the hot gas bypass electronic expansion valve 41 has been running at the fourth preset opening degree for a third preset time, in response to determining that the indoor air outlet temperature is greater than the second air outlet temperature threshold and the indoor fan speed is less than or equal to the second speed threshold, the opening degree of the hot gas bypass electronic expansion valve 41 is reduced to the fifth preset opening degree. Wherein, the first speed threshold is greater than the second speed threshold.

[0055] Here, the third preset time can be preset in the control system of the air conditioner 1, and can be used as the lower limit of the time length of the hot gas bypass electronic expansion valve 41 at the fourth preset opening degree. The fifth preset opening degree can be preset in the control system of the air conditioner 1, and the fifth preset opening degree is less than the fourth preset opening degree; the fifth preset opening degree and the first preset opening degree can be set to the same or different values, and this application embodiment does not limit this. The second speed threshold can be preset in the control system of the air conditioner 1, and its specific value can be determined according to actual needs, and this application embodiment does not limit this; for example, the second speed threshold can be set as the lower limit of the indoor fan speed in the normal cooling operation mode, such as the first speed lower limit described below.

[0056] After the hot gas bypass electronic expansion valve 41 operates at the fourth preset opening for the third preset time, if it is determined that the indoor air outlet temperature is greater than the second air outlet temperature threshold and the indoor fan speed is less than or equal to the second speed threshold, it indicates that the indoor air outlet temperature is too high, the indoor environment is obviously too hot, and the indoor fan speed and indoor return air volume have reached the lower limit and cannot be further reduced. At this time, the opening of the hot gas bypass electronic expansion valve 41 can be controlled to be reduced to the fifth preset opening to increase the throttling effect of the hot gas bypass electronic expansion valve 41 on the refrigerant flowing through the hot gas bypass branch 40, reduce the temperature of the refrigerant supplied to the indoor heat exchanger 30 by the hot gas bypass branch 40, thereby reducing the temperature and superheat of the indoor heat exchanger 30, improving the cooling effect of the indoor heat exchanger 30 on the indoor environment, and thus making the indoor environment a cooler and more comfortable temperature environment.

[0057] In some examples, the second operation may include S243.

[0058] S243: After the hot gas bypass electronic expansion valve 41 operates at the fourth preset opening degree for the third preset time, in response to determining that the indoor air outlet temperature is greater than the second air outlet temperature threshold and the indoor fan speed is greater than the second speed threshold, the indoor fan speed is controlled to decrease.

[0059] After the hot gas bypass electronic expansion valve 41 operates at the fourth preset opening for the third preset time, if it is determined that the indoor air outlet temperature is greater than the second air outlet temperature threshold and the indoor fan speed is greater than the second speed threshold, then the indoor air outlet temperature is too high and the indoor environment is obviously too hot. However, the indoor fan speed and indoor return air volume have not yet reached the lower limit. At this time, the indoor fan speed can be controlled to be further reduced to a speed value not lower than the second speed threshold, so as to further reduce the indoor return air volume and reduce the indoor air outlet temperature, thereby increasing the cooling feeling of the indoor environment and making the indoor environment a relatively cool and comfortable temperature environment.

[0060] By setting S21 to S24, it is possible to determine in a timely manner whether the indoor environment is within the temperature range that is comfortable for the human body when adjusting the indoor load. In the event of a risk of discomfort, the opening degree of the hot gas bypass electronic expansion valve 41 can be adjusted. This can prevent the compressor 10 from shutting down due to the low indoor load, thus avoiding frequent start-stop of the compressor 10, and also prevent discomfort caused by the increase in indoor load, thus ensuring the user's comfort.

[0061] like Figure 3 As shown, in some embodiments, the above-described air conditioner control method may include S31 to S35.

[0062] S31: In response to determining that the temperature difference between the indoor temperature and the set temperature is greater than or equal to a first temperature difference threshold and less than or equal to a second temperature difference threshold, determine whether the indoor fan speed is greater than a first speed lower limit.

[0063] Here, the first lower speed limit can be the lower speed limit of the indoor fan in normal cooling operation mode. When the temperature difference between the indoor temperature and the set temperature is greater than or equal to the first temperature difference threshold and less than or equal to the second temperature difference threshold, it can be determined that the indoor load of air conditioner 1 in cooling operation mode is low but not too low, and compressor 10 faces a certain but small risk of shutdown, which needs to be addressed. At this time, it can be determined whether the indoor fan speed is greater than the first lower speed limit to determine the possible intervention measures.

[0064] S32: In response to determining that the indoor fan speed is greater than the first lower speed limit, control the indoor fan speed to decrease and control the hot gas bypass electronic expansion valve 41 to remain closed.

[0065] When the indoor fan speed is determined to be greater than the first lower limit, it can be determined that the indoor fan speed and indoor return air volume have not yet reached the lower limit. At this time, the indoor fan speed can be controlled to continue to decrease in the normal cooling operation mode to reduce the indoor cooling output, increase the indoor air temperature, and thus increase the indoor load, so as to avoid the compressor 10 from stopping due to the low indoor load, thereby avoiding frequent start-stop of the compressor 10.

[0066] S33: In response to determining that the indoor fan speed is equal to a first lower speed limit, control the indoor fan speed to decrease to below the first lower speed limit, and determine whether the indoor fan speed is greater than a second lower speed limit. The second lower speed limit is less than the first lower speed limit, and the second lower speed limit can be set, for example, as the lower speed limit of the indoor fan under safe operating conditions of the air conditioner 1.

[0067] When the indoor fan speed is determined to be equal to the first lower speed limit, it can be confirmed that the indoor fan speed has reached the lower speed limit under normal cooling operation. At this point, the air conditioner 1 can be temporarily deactivated to remove the lower speed limit restriction on the indoor fan, allowing the indoor fan speed to be further reduced to below the first lower speed limit. This further reduces the cooling output on the indoor side, increases the indoor air outlet temperature, and thus increases the indoor load, preventing the compressor 10 from shutting down due to excessively low indoor load, thereby avoiding frequent start-stop of the compressor 10. Simultaneously, the indoor fan speed needs to be monitored and controlled to prevent it from exceeding or significantly exceeding the second lower speed limit.

[0068] S34: In response to determining that the indoor fan speed is less than or equal to the second speed lower limit, control the hot gas bypass electronic expansion valve 41 to open.

[0069] When the indoor fan speed is determined to be less than or equal to the second lower speed limit, it can be determined that the indoor fan speed has reached the lower limit of safe operation and cannot be reduced further. At this time, the hot gas bypass electronic expansion valve 41 can be opened to direct at least part of the refrigerant discharged by the compressor 10 directly to the refrigerant input end of the indoor heat exchanger 30 through the hot gas bypass branch 40, thereby reducing the amount of cold absorbed from the outdoor side, thereby increasing the indoor load and preventing the compressor 10 from shutting down due to the low indoor load.

[0070] S35: In response to determining that the indoor fan speed is greater than the second lower speed limit, control the indoor fan speed to decrease and control the hot gas bypass electronic expansion valve 41 to remain closed.

[0071] When it is determined that the indoor fan speed is greater than the second lower speed limit, it can be determined that the indoor fan speed has not yet reached the safe operating lower limit and can be further reduced. At this time, the air conditioner 1 can be controlled to temporarily release the lower limit restriction on the indoor fan speed, so that the indoor fan speed can be further reduced to below the first lower speed limit, so as to further reduce the indoor cooling output, increase the indoor air outlet temperature, and thus increase the indoor load, avoid the compressor 10 from stopping due to the low indoor load, and thus avoid the compressor 10 from frequently starting and stopping.

[0072] like Figure 4 As shown, in some embodiments, the above-described air conditioner control method may include S41 to S43.

[0073] S41: In response to determining that the temperature difference between the indoor temperature and the set temperature is greater than a second temperature difference threshold, determine whether the hot gas bypass electronic expansion valve 41 is in the open state.

[0074] S42: In response to the hot gas bypass electronic expansion valve 41 being in the open state, control the hot gas bypass electronic expansion valve 41 to close.

[0075] S43: In response to the hot gas bypass electronic expansion valve 41 not being in the open state, control the hot gas bypass electronic expansion valve 41 to remain closed. Wherein, the first temperature difference threshold is less than the second temperature difference threshold.

[0076] When the temperature difference between the indoor temperature and the set temperature exceeds the second temperature difference threshold, it indicates that the indoor load of the air conditioner 1 is high in cooling mode, the compressor 10 is operating normally, there is no immediate risk of shutdown, or the risk of shutdown has been eliminated. At this time, it can be determined whether the hot gas bypass electronic expansion valve 41 is open. If the hot gas bypass electronic expansion valve 41 is open, it means that S20 has achieved the effect of eliminating the risk of shutdown for the compressor 10, and the hot gas bypass electronic expansion valve 41 can be closed. If the hot gas bypass electronic expansion valve 41 is not open, it is not necessary to activate the hot gas bypass function temporarily, and the hot gas bypass electronic expansion valve 41 can be kept closed to avoid interfering with the normal cooling of the air conditioner 1.

[0077] Secondly, embodiments of this application provide an air conditioner control device, including: a temperature difference comparison circuit configured to determine whether the temperature difference between the indoor temperature and the set temperature is less than a first temperature difference threshold in response to the air conditioner 1 being in a cooling operation mode; and an opening control circuit configured to control the opening of a hot gas bypass electronic expansion valve 41 in response to determining that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, and to control the opening degree of the hot gas bypass electronic expansion valve 41 according to the superheat of the indoor heat exchanger 30, the indoor air outlet temperature, and the indoor fan speed.

[0078] like Figure 5 As shown, in a third aspect, this application provides an air conditioner 1, which includes a compressor 10, a reversing valve 20, an indoor heat exchanger 30, a hot gas bypass branch 40, a processor, and a memory. The hot gas bypass branch 40 connects the exhaust port of the compressor 10 to the end of the indoor heat exchanger 30 away from the reversing valve 20, and a hot gas bypass electronic expansion valve 41 is provided on the hot gas bypass branch 40. The memory stores a computer program, which, when executed by the processor, implements the air conditioner control method as described in any of the above embodiments. The type of air conditioner 1 can be determined according to actual needs, and can be, for example, a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, etc., and this application does not limit this type.

[0079] The processor is connected to the memory and can perform various actions and processes according to the programs stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor, and can be based on an x86 architecture or an ARM architecture.

[0080] The memory can be volatile or non-volatile, or may include both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM) used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory used in the methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0081] In some embodiments, the compressor 10 can be a fixed-frequency compressor. Thus, the air conditioner 1 can be a fixed-frequency air conditioner.

[0082] In some embodiments, the air conditioner 1 may include an outdoor heat exchanger 50 and a main circuit throttling device 60. The outdoor heat exchanger 50 is connected to a reversing valve 20. The main circuit throttling device 60 is disposed between the outdoor heat exchanger 50 and the indoor heat exchanger 30. A check valve 42 may be provided on the hot gas bypass branch 40.

[0083] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0084] For example, the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., CDs (Compact Disks), DVDs (Digital Versatile Disks), etc.), smart cards, and flash memory devices (e.g., EPROMs (Erasable Programmable Read-Only Memory), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the embodiments of this application may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0085] The above provides a detailed description of an air conditioner and its control method, apparatus, and computer-readable storage medium provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An air conditioner control method characterized by comprising: The air conditioner comprises a compressor, a reversing valve, an indoor heat exchanger, and a hot gas bypass branch connected to a discharge port of the compressor and an end of the indoor heat exchanger away from the reversing valve, and the hot gas bypass branch is provided with a hot gas bypass electronic expansion valve, and the air conditioner control method comprises: In response to the air conditioner being in a cooling operation mode, determining whether a temperature difference between an indoor temperature and a set temperature is less than a first temperature difference threshold; In response to determining that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, controlling the hot gas bypass electronic expansion valve to be opened, and controlling an opening degree of the hot gas bypass electronic expansion valve according to a superheat degree of the indoor heat exchanger, an indoor air outlet temperature, and an indoor fan rotating speed; Controlling the hot gas bypass electronic expansion valve to be opened and controlling an opening degree of the hot gas bypass electronic expansion valve according to a superheat degree of the indoor heat exchanger, an indoor air outlet temperature, and an indoor fan rotating speed, comprises: Controlling the hot gas bypass electronic expansion valve to be opened and operating at a first preset opening degree; After the hot gas bypass electronic expansion valve operates at the first preset opening degree for a first preset time, determining whether the superheat degree of the indoor heat exchanger is greater than a superheat degree threshold; In response to determining that the superheat degree of the indoor heat exchanger is greater than the superheat degree threshold, performing the following first operation: Controlling the opening degree of the hot gas bypass electronic expansion valve to be reduced to a second preset opening degree; After the hot gas bypass electronic expansion valve operates at the second preset opening degree for a second preset time, in response to determining that the indoor air outlet temperature is less than or equal to a first air outlet temperature threshold and the indoor fan rotating speed is greater than or equal to a first rotating speed threshold, controlling the opening degree of the hot gas bypass electronic expansion valve to be increased to a third preset opening degree; In response to determining that the superheat degree of the indoor heat exchanger is less than the superheat degree threshold, performing the following second operation: Controlling the opening degree of the hot gas bypass electronic expansion valve to be increased to a fourth preset opening degree; After the hot gas bypass electronic expansion valve operates at the fourth preset opening degree for a third preset time, in response to determining that the indoor air outlet temperature is greater than a second air outlet temperature threshold and the indoor fan rotating speed is less than or equal to a second rotating speed threshold, controlling the opening degree of the hot gas bypass electronic expansion valve to be reduced to a fifth preset opening degree; The first rotating speed threshold is greater than the second rotating speed threshold.

2. The air conditioner control method of claim 1, wherein, The first operation comprises: After the hot gas bypass electronic expansion valve operates at the second preset opening degree for a second preset time, in response to determining that the indoor air outlet temperature is less than or equal to the first air outlet temperature threshold and the indoor fan rotating speed is less than the first rotating speed threshold, controlling the indoor fan rotating speed to be increased.

3. The air conditioner control method of claim 1, wherein, The second operation comprises: After the hot gas bypass electronic expansion valve operates at the fourth preset opening degree for a third preset time, in response to determining that the indoor air outlet temperature is greater than a second air outlet temperature threshold and the indoor fan rotating speed is greater than a second rotating speed threshold, controlling the indoor fan rotating speed to be reduced.

4. The air conditioner control method of claim 1, wherein, The air conditioner control method comprises: In response to determining that the temperature difference between the indoor temperature and the set temperature is greater than or equal to the first temperature difference threshold and less than or equal to a second temperature difference threshold, determining whether the indoor fan rotating speed is greater than a first rotating speed lower limit; in response to determining that the indoor fan speed is greater than the first lower speed limit, controlling the indoor fan speed to decrease and controlling the hot gas bypass electronic expansion valve to remain closed; in response to determining that the indoor fan speed is equal to the first lower speed limit, controlling the indoor fan speed to decrease to below the first lower speed limit and determining whether the indoor fan speed is greater than a second lower speed limit; in response to determining that the indoor fan speed is less than or equal to the second lower speed limit, controlling the hot gas bypass electronic expansion valve to open; in response to determining that the indoor fan speed is greater than the second lower speed limit, controlling the indoor fan speed to decrease and controlling the hot gas bypass electronic expansion valve to remain closed; the second lower speed limit is less than the first lower speed limit.

5. The air conditioner control method of claim 1, wherein, The air conditioner control method comprises: in response to determining that a temperature difference between the indoor temperature and the set temperature is greater than a second temperature difference threshold, determining whether the hot gas bypass electronic expansion valve is in an open state; in response to the hot gas bypass electronic expansion valve being in the open state, controlling the hot gas bypass electronic expansion valve to close; in response to the hot gas bypass electronic expansion valve not being in the open state, controlling the hot gas bypass electronic expansion valve to remain closed; the first temperature difference threshold is less than the second temperature difference threshold.

6. An air conditioner control device characterized by comprising: The air conditioner comprises a compressor, a reversing valve, an indoor heat exchanger, and a hot gas bypass branch, the hot gas bypass branch connecting a discharge port of the compressor and an end of the indoor heat exchanger away from the reversing valve, a hot gas bypass electronic expansion valve being arranged on the hot gas bypass branch, and the air conditioner control device comprises: a temperature difference comparison circuit configured to, in response to the air conditioner being in a cooling operation mode, determine whether a temperature difference between an indoor temperature and a set temperature is less than a first temperature difference threshold; an opening degree control circuit configured to, in response to determining that the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, control the hot gas bypass electronic expansion valve to open and control an opening degree of the hot gas bypass electronic expansion valve according to a superheat degree of the indoor heat exchanger, an indoor air outlet temperature, and an indoor fan speed; controlling the hot gas bypass electronic expansion valve to open and controlling an opening degree of the hot gas bypass electronic expansion valve according to a superheat degree of the indoor heat exchanger, an indoor air outlet temperature, and an indoor fan speed, comprises: controlling the hot gas bypass electronic expansion valve to open and operate at a first preset opening degree; after the hot gas bypass electronic expansion valve operates at the first preset opening degree for a first preset time, determining whether the superheat degree of the indoor heat exchanger is greater than a superheat degree threshold; in response to determining that the superheat degree of the indoor heat exchanger is greater than the superheat degree threshold, performing the following first operation: controlling the opening degree of the hot gas bypass electronic expansion valve to decrease to a second preset opening degree; after the hot gas bypass electronic expansion valve operates at the second preset opening degree for a second preset time, in response to determining that the indoor air outlet temperature is less than or equal to a first air outlet temperature threshold and the indoor fan speed is greater than or equal to a first speed threshold, controlling the opening degree of the hot gas bypass electronic expansion valve to increase to a third preset opening degree; in response to determining that the superheat degree of the indoor heat exchanger is less than the superheat degree threshold, performing the following second operation: control the opening degree of the hot gas bypass electronic expansion valve to increase to a fourth preset opening degree; after the hot gas bypass electronic expansion valve operates at the fourth preset opening degree for a third preset time, in response to determining that the indoor air outlet temperature is greater than a second air outlet temperature threshold and the indoor fan rotating speed is less than or equal to a second rotating speed threshold, control the opening degree of the hot gas bypass electronic expansion valve to decrease to a fifth preset opening degree; the first rotating speed threshold is greater than the second rotating speed threshold.

7. An air conditioner characterized by comprising: comprise: a compressor, a reversing valve, an indoor heat exchanger, and a hot gas bypass branch, the hot gas bypass branch connecting a discharge port of the compressor and an end of the indoor heat exchanger away from the reversing valve, and the hot gas bypass branch being provided with a hot gas bypass electronic expansion valve; a memory storing a computer program; a processor, the computer program being executed by the processor to implement the air conditioner control method of any one of claims 1 to 5.

8. The air conditioner of claim 7, wherein the compressor is a fixed frequency compressor.

9. A computer-readable storage medium, characterized in that, a computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the air conditioner control method of any one of claims 1 to 5.

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