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

Abstract

The embodiment of the invention provides an air conditioner, a control method and device of the air conditioner and a computer readable storage medium, the air conditioner comprises a compressor, a reversing valve, an indoor heat exchanger and a hot gas bypass branch, and the hot gas bypass branch is connected with an exhaust port of the compressor and the end, away from the reversing valve, of the indoor heat exchanger; a hot gas bypass electronic expansion valve is arranged on the hot gas bypass branch, and the air conditioner control method comprises the steps that in response to the situation that the air conditioner is in a refrigeration operation mode, whether the temperature difference between the indoor temperature and the set temperature is smaller than a first temperature difference threshold value or not is determined; and in response to the fact that the temperature difference between the indoor temperature and the set temperature is smaller than the first temperature difference threshold value, the hot gas bypass electronic expansion valve is controlled to be opened, and the opening degree of the hot gas bypass electronic expansion valve is controlled according to the superheat degree of the indoor heat exchanger, the indoor air outlet temperature and the rotating speed of an indoor fan.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to an air conditioner and a control method, device, and computer-readable storage medium thereof. Background Art

[0002] In the related art, after reaching the set temperature, the fixed-frequency air conditioner will execute the compressor shutdown action, and then restart the compressor after meeting the restart conditions, resulting in the compressor having to be started and stopped frequently. Frequent start and stop of the compressor will significantly increase the operating energy consumption of the air conditioner, and cause large fluctuations in the temperature of the indoor environment and poor environmental comfort. Summary of the invention

[0003] The embodiments of the present application provide an air conditioner and a control method, device, and computer-readable storage medium thereof, which can avoid frequent starting and stopping of the compressor and improve the comfort of the air conditioner during cooling.

[0004] In a first aspect, an embodiment of the present application provides an air conditioner control method, wherein the air conditioner includes 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 an 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. 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 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, the hot gas bypass electronic expansion valve is controlled to open, and the opening degree of the hot gas bypass electronic expansion valve is controlled according to the superheat of the indoor heat exchanger, the indoor air outlet temperature and the indoor fan speed, including: 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 the superheat threshold value; in response to determining that the superheat of the indoor heat exchanger is greater than the superheat threshold value, 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, When 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, the opening of the hot gas bypass electronic expansion valve is controlled to increase 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 controlled to increase 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 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 of the hot gas bypass electronic expansion valve is controlled to decrease 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 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 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 the first temperature difference threshold and less than or equal to the second temperature difference threshold, determining whether the indoor fan speed is greater than a first speed lower limit; in response to determining that the indoor fan speed is greater than the first speed lower 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 speed lower limit, controlling the indoor fan speed to decrease to below the first speed lower limit, and determining whether the indoor fan speed is greater than the second speed lower limit; in response to determining that the indoor fan speed is less than or equal to the second speed lower 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 speed lower limit, controlling the indoor fan speed to decrease and controlling the hot gas bypass electronic expansion valve to remain closed; the second speed lower limit is less than the first speed lower limit.

[0009] 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 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 an 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 an 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.

[0010] In a second aspect, an embodiment of the present application provides an air conditioner control device, wherein the air conditioner includes 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 an 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. 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; an opening control circuit, configured to control the hot gas bypass electronic expansion valve to open 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 control the opening 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] In a third aspect, an embodiment of the present application provides an air conditioner, comprising: 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 an 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, the air conditioner control method as described in any of the above embodiments is implemented.

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

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the air conditioner control method described above.

[0014] The air conditioner control method provided in the embodiment of the present application can accurately determine the time point when the compressor is facing the risk of shutdown, open the hot gas bypass electronic expansion valve in time, and accurately control the opening 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 and throttling state of the refrigerant provided through the hot gas bypass branch, so as to accurately and appropriately increase the indoor load within the temperature range that is comfortable for the human body. It can avoid the compressor from shutting down due to too low indoor load and thus avoid frequent starting and stopping of the compressor, and can also avoid physical discomfort to the human body caused by the increase in indoor load, thereby ensuring the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a flow chart of an air conditioner control method provided by some embodiments of the present application;

[0017] Figure 2 is a partial flow chart of an air conditioner control method provided by some embodiments of the present application;

[0018] Figure 3 is another partial flow chart of the air conditioner control method provided by some embodiments of the present application;

[0019] Figure 4 is another partial flow chart of the air conditioner control method provided by some embodiments of the present application;

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

[0021] Description of main 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 DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[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 "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0027] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0028] like Figure 1 and Figure 5 As shown, in the first aspect, the embodiment of the present application provides an air conditioner control method for controlling an air conditioner 1. The air conditioner control method includes S10 to S20, which can avoid frequent start and stop of the compressor 10 and improve the use 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. The hot gas bypass branch 40 is provided with a hot gas bypass electronic expansion valve 41. When the air conditioner 1 is in the 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, so that the hot gas bypass branch 40 connects the exhaust port of the compressor 10 and the refrigerant input end of the indoor heat exchanger 30. The type of the compressor 10 can be determined according to actual needs, and can be, for example, a fixed frequency compressor, a variable frequency compressor, etc., which is not limited in the embodiment of the present application; in some embodiments, the compressor 10 can be a fixed frequency compressor 10, which can only realize the switching between the start and stop states, but cannot perform frequency adjustment.

[0030] In some examples, a check valve 42 may also be provided on the hot gas bypass branch 40. The check valve 42 is also called a one-way valve and has a one-way conduction function, which makes the hot gas bypass branch 40 one-way conduction, 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, thereby 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 the cooling operation mode, determining 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 by real-time measurement by a temperature sensor arranged on the indoor side. The set temperature is the target temperature that the indoor environment is expected to reach, which can be set by manual input by the user, or automatically generated by the air conditioner 1 according to operating conditions such as the user's usage habits, current environmental information, etc., 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. The first temperature difference threshold can be pre-set in the control system of the air conditioner 1 to determine the degree of 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°C, 3°C, etc., which is not limited to this embodiment of the present application.

[0033] According to the temperature difference between the indoor temperature and the set temperature and the comparison of the first temperature difference threshold, the degree of similarity between the indoor temperature and the set temperature can be determined; and then the indoor load of the air conditioner 1 in the cooling operation mode can be determined according to the degree of similarity between the indoor temperature and the set temperature. Exemplarily, if the temperature difference between the indoor temperature and the set temperature is greater than or equal to the first temperature difference threshold, it means that the indoor load of the air conditioner 1 in the cooling operation mode is not too low, and the compressor 10 does not have a shutdown risk or only has a small shutdown risk; if the temperature difference between the indoor temperature and the set temperature is less than the first temperature difference threshold, it means that the indoor load of the air conditioner 1 in the cooling operation mode is too low, and the compressor 10 may face a large shutdown risk.

[0034] S20: In response to determining 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 controlled to open, and the opening 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 it is determined that 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 the cooling operation mode is too low, and the compressor 10 may face a greater 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 to the refrigerant input end of the indoor heat exchanger 30 via the hot gas bypass branch 40, reduce the amount of cold absorbed from the outdoor side, and accurately control the opening of the hot gas bypass electronic expansion valve 41 according to the superheat of the indoor heat exchanger 30, the indoor outlet air 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 supply of refrigerant flow are more accurate, so as to accurately and appropriately increase the indoor load within the temperature range comfortable for human body, which can not only avoid the shutdown of the compressor 10 due to the low indoor load, and thus avoid the frequent start and stop of the compressor 10, but also avoid the discomfort of the human body caused by the increase of indoor load, thereby ensuring the user's comfort.

[0036] Compared with the related art, the air conditioner control method provided in the embodiment of the present application can accurately judge the time point when the compressor 10 faces a greater risk of shutdown, open the hot gas bypass electronic expansion valve 41 in time, and accurately control the opening 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 accurately and appropriately increase the indoor load within the temperature range comfortable for the human body. It can avoid the shutdown of the compressor 10 due to too low indoor load, and thus avoid frequent start and stop of the compressor 10, and avoid physical discomfort to the human body caused by the increase in indoor load, thereby ensuring the user's comfort.

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

[0038] S21: Control the hot gas bypass electronic expansion valve 41 to open and operate at a first preset opening. Here, the first preset opening can be pre-set in the control system of the air conditioner 1 and can be used as a default opening 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 for a first preset time, it is determined whether the superheat of the indoor heat exchanger 30 is greater than a 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 length of time that the hot gas bypasses the electronic expansion valve 41 at the first preset opening. The superheat threshold can be pre-set in the control system of the air conditioner 1, and can be used as a mark for judging the magnitude of the superheat of the indoor heat exchanger 30.

[0041] After the hot gas bypass electronic expansion valve 41 operates at the first preset opening for the 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 shutdown risk faced by the compressor 10 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 to determine the temperature state of the indoor heat exchanger 30, and then judge the comfort of the indoor environment.

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

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

[0044] Here, the second preset opening can be pre-set in the control system of the air conditioner 1, and the second preset opening is smaller than the first preset opening. When it is determined that the superheat of the indoor heat exchanger 30 is greater than the superheat threshold, it means 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 of the hot gas bypass electronic expansion valve 41 can be controlled to be reduced to the second preset opening, 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, and then 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, so that the indoor temperature environment is relatively cool and comfortable.

[0045] S232: After the hot gas bypass electronic expansion valve 41 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 greater than or equal to the first speed threshold, the opening of the hot gas bypass electronic expansion valve 41 is controlled to increase to a third preset opening.

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

[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 outlet air temperature is less than or equal to the first outlet air temperature threshold and the indoor fan speed is greater than or equal to the first speed threshold, it means that the indoor outlet air temperature is low, the indoor environment is obviously cold, and the speed of the indoor fan speed and the indoor return air volume have reached the upper limit and cannot be further increased; at this time, the opening of the hot gas bypass electronic expansion valve 41 can be controlled to increase to the third preset opening, so as 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 temperature of the refrigerant supplied to the indoor heat exchanger 30 by the hot gas bypass branch 40, and thereby increase the temperature and superheat of the indoor heat exchanger 30, and reduce the cooling effect of the indoor heat exchanger 30 on the indoor environment, so that the indoor temperature is in a comfortable range without causing 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 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, 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 outlet air temperature is less than or equal to the first outlet air temperature threshold and the indoor fan speed is less than the first speed threshold, it means that the indoor outlet air temperature is low and the indoor environment is obviously cold, but the indoor fan speed and the indoor return air volume have not reached the upper limit. At this time, the indoor fan speed can be controlled to further increase to a speed value not exceeding the first speed threshold, so as to further increase the indoor return air volume and increase the indoor outlet air temperature, thereby reducing the coldness of the indoor environment, so that the indoor temperature is in a comfortable range without causing a cold feeling.

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

[0052] S241: Controlling the opening degree of the hot gas bypass electronic expansion valve 41 to increase to a fourth preset opening degree.

[0053] Here, the fourth preset opening can be pre-set in the control system of the air conditioner 1, and the fourth preset opening is smaller than the first preset opening. When it is determined that the superheat of the indoor heat exchanger 30 is smaller than the superheat threshold, it means that the temperature of the indoor heat exchanger 30 is relatively low and the amount of cooling obtained by the indoor environment is relatively large; at this time, the opening of the hot gas bypass electronic expansion valve 41 can be controlled to increase to the fourth preset opening, 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 temperature of the refrigerant supplied to the indoor heat exchanger 30 by the hot gas bypass branch 40, and then increase the temperature and superheat of the indoor heat exchanger 30, reduce the cooling effect of the indoor heat exchanger 30 on the indoor environment, so that the indoor temperature is in a comfortable range without causing a cold feeling.

[0054] S242: After the hot gas bypass electronic expansion valve 41 operates at the fourth preset opening 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 less than or equal to the second speed threshold, the opening of the hot gas bypass electronic expansion valve 41 is controlled to decrease to a fifth preset opening, wherein the first speed threshold is greater than the second speed threshold.

[0055] Here, the third preset time can be pre-set in the control system of the air conditioner 1, and can serve as the lower limit of the length of time for the hot gas to bypass the electronic expansion valve 41 with the fourth preset opening. The fifth preset opening can be pre-set in the control system of the air conditioner 1, and the fifth preset opening is less than the fourth preset opening; the fifth preset opening and the first preset opening can be set to the same or different values, which is not limited in the embodiment of the present application. The second speed threshold can be pre-set in the control system of the air conditioner 1, and its specific value can be determined according to actual needs, which is not limited in the embodiment of the present application; illustratively, the second speed threshold can be set to the lower limit of the speed of the indoor fan in the conventional 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 outlet air temperature is greater than the second outlet air temperature threshold and the indoor fan speed is less than or equal to the second speed threshold, it means that the indoor outlet air temperature is too high, the indoor environment is obviously too hot, and the speed of the indoor fan speed and the 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, and thereby reduce the temperature and superheat of the indoor heat exchanger 30, and improve the cooling effect of the indoor heat exchanger 30 on the indoor environment, so that the indoor temperature is in a relatively cool and 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 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 greater than the second speed threshold, controlling the indoor fan speed 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 outlet air temperature is greater than the second outlet air temperature threshold and the indoor fan speed is greater than the second speed threshold, the indoor outlet air temperature is high and the indoor environment is obviously hotter, but the indoor fan speed and the indoor return air volume have not reached the lower limit. At this time, the indoor fan speed can be controlled to further reduce to a speed value not lower than the second speed threshold, so as to further reduce the indoor return air volume and the indoor outlet air temperature, thereby increasing the coolness of the indoor environment, so that the indoor temperature is in a cooler and more comfortable environment.

[0060] By setting S21~S24, when the indoor load is adjusted, it can be determined in time whether the indoor environment is within the temperature range that is comfortable for the human body, and then the opening of the hot gas bypass electronic expansion valve 41 can be adjusted when there is a risk of discomfort. This can prevent the compressor 10 from shutting down due to low indoor load and thus avoid frequent start and stop of the compressor 10, and can also avoid human discomfort caused by increased indoor load, thereby ensuring the user's comfort.

[0061] like Figure 3 As shown, in some embodiments, the 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, determining whether the indoor fan speed is greater than a first speed lower limit.

[0063] Here, the first speed lower limit may be the speed lower limit of the indoor fan in the conventional cooling operation mode. When it is determined 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 the second temperature difference threshold, it can be determined that the indoor load of the air conditioner 1 in the cooling operation mode is low but not too low, and the compressor 10 is facing a certain but small shutdown risk, which needs to be eliminated by intervention. At this time, it can be determined whether the indoor fan speed is greater than the first speed lower limit to determine the intervention measures that can be taken.

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

[0065] When it is determined that the indoor fan speed is greater than the first speed lower limit, it can be determined that the indoor fan speed and the indoor return air volume have not reached the lower limit. At this time, the indoor fan speed can be controlled to continue to decrease under the conventional refrigeration operation mode to reduce the indoor cooling output, increase the indoor air outlet temperature, and then increase the indoor load, so as to avoid the compressor 10 from shutting down due to the indoor load being too low, thereby avoiding frequent start and stop of the compressor 10.

[0066] S33: In response to determining that the indoor fan speed is equal to the first speed lower limit, controlling the indoor fan speed to decrease to below the first speed lower limit, and determining whether the indoor fan speed is greater than the second speed lower limit. The second speed lower limit is less than the first speed lower limit, and the second speed lower limit can be set to, for example, the speed lower limit of the indoor fan in the safe operation state of the air conditioner 1.

[0067] When it is determined that the indoor fan speed is equal to the first speed lower limit, it can be determined that the indoor fan speed has reached the speed lower limit in the conventional cooling operation mode; at this time, the air conditioner 1 can be controlled to temporarily release the lower limit of the indoor fan speed, so that the indoor fan speed can be further reduced to below the first speed lower limit, so as to further reduce the indoor cooling output, increase the indoor air outlet temperature, and then increase the indoor load, so as to avoid the compressor 10 from shutting down due to too low indoor load, thereby avoiding frequent start and stop of the compressor 10. At the same time, it is necessary to monitor and control the indoor fan speed to prevent the indoor fan speed from breaking through or significantly breaking through the speed value below the second speed lower limit.

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

[0069] When it is determined that the indoor fan speed is less than or equal to the second speed lower limit, it can be determined that the indoor fan speed has reached the safe operating lower limit and cannot be further reduced; at this time, the hot gas bypass electronic expansion valve 41 can be controlled to open, so as 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, reduce the cold absorbed from the outdoor side, and thus increase the indoor load, so as to avoid the compressor 10 from shutting down due to too low indoor load.

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

[0071] When it is determined that the indoor fan speed is greater than the second speed lower limit, it can be determined that the indoor fan speed has not reached the safe operation lower limit and can be further reduced; at this time, the air conditioner 1 can be controlled to temporarily lift the lower limit of the indoor fan speed, so that the indoor fan speed can be further reduced to below the first speed lower limit, so as to further reduce the indoor cooling output, increase the indoor air outlet temperature, and then increase the indoor load, so as to avoid the compressor 10 from shutting down due to too low indoor load, thereby avoiding frequent starting and stopping of the compressor 10.

[0072] like Figure 4 As shown, in some embodiments, the 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 the second temperature difference threshold, determining whether the hot gas bypass electronic expansion valve 41 is in an open state.

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

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

[0076] When it is determined that the temperature difference between the indoor temperature and the set temperature is greater than the second temperature difference threshold, it means that the indoor load of the air conditioner 1 in the cooling operation mode is high, the compressor 10 is in normal operation, there is no risk of shutdown for the time being, 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 in the open state. If the hot gas bypass electronic expansion valve 41 is in the open state, it means that S20 has achieved the effect of eliminating the risk of shutdown of the compressor 10, and the hot gas bypass electronic expansion valve 41 can be controlled to be closed. If the hot gas bypass electronic expansion valve 41 is not in the open state, there is no need to turn on the hot gas bypass function temporarily, and the hot gas bypass electronic expansion valve 41 can be controlled to remain closed to avoid interference with the normal cooling of the air conditioner 1.

[0077] In the second aspect, an embodiment of the present application provides 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; an opening control circuit, configured to control the hot gas bypass electronic expansion valve 41 to open 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 control the opening 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 the third aspect, the embodiment of the present 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 and 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, and when the computer program is executed by the processor, an air conditioner control method as in any of the above embodiments is implemented. The type of the 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., which is not limited in the embodiment of the present application.

[0079] The processor is connected to the memory and can perform various actions and processes according to the program stored in the memory. Specifically, the processor can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can be an X86 architecture or an ARM architecture.

[0080] The memory may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is 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), synchronously linked dynamic random access memory (SLDRAM), and direct memory bus random access memory (DRRAM). It should be noted that the memory of the method 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 may be a fixed-frequency compressor. Thus, the air conditioner 1 may 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 the reversing valve 20, the main circuit throttling device 60 is arranged between the outdoor heat exchanger 50 and the indoor heat exchanger 30, and a check valve 42 may be provided on the hot gas bypass branch 40.

[0083] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by a processor to execute the steps in the control method of any of the above embodiments.

[0084] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (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 the present 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 is a detailed introduction to an air conditioner and its control method, device, and computer-readable storage medium provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An air conditioner control method, characterized in that: The air conditioner comprises a compressor, a reversing valve, an indoor heat exchanger and a hot gas bypass branch, wherein the hot gas bypass branch connects an exhaust port of the compressor and an end of the indoor heat exchanger away from the reversing valve, and 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 a first temperature difference threshold, the hot gas bypass electronic expansion valve is controlled to open, and the opening of the hot gas bypass electronic expansion valve is controlled according to the superheat of the indoor heat exchanger, the indoor air outlet temperature and the indoor fan speed.

2. The air conditioner control method according to claim 1, characterized in that: Controlling the hot gas bypass electronic expansion valve to open, and controlling the opening 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, including: Controlling the hot gas bypass electronic expansion valve to open and operate at a first preset opening; After the hot gas bypass electronic expansion valve operates at the first preset opening 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 of the hot gas bypass electronic expansion valve to decrease to a second preset opening; 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 greater than or equal to the first speed threshold, controlling the opening of the hot gas bypass electronic expansion valve to increase to a third preset opening; In response to determining that the superheat of the indoor heat exchanger is less than the superheat threshold, performing the following second operation: Controlling the opening of the hot gas bypass electronic expansion valve to increase 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 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, controlling the opening of the hot gas bypass electronic expansion valve to decrease to a fifth preset opening; The first speed threshold is greater than the second speed threshold.

3. The air conditioner control method according to claim 2, characterized in that: 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, the indoor fan speed is controlled to increase.

4. The air conditioner control method according to claim 2, characterized in that: The second operation includes: 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 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.

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

6. The air conditioner control method according to claim 1, characterized in that: 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 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 an 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 an open state, controlling the hot gas bypass electronic expansion valve to remain closed; The first temperature difference threshold is smaller than the second temperature difference threshold.

7. An air conditioner control device, characterized in that: The air conditioner comprises 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 an end of the indoor heat exchanger away from the reversing valve, and a hot gas bypass electronic expansion valve is arranged on the hot gas bypass branch. The air conditioner control device comprises: 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; The opening control circuit is configured to control the hot gas bypass electronic expansion valve to open in response to determining that the temperature difference between the indoor temperature and the set temperature is less than a first temperature difference threshold, and to control the opening 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.

8. An air conditioner, characterized in that: include: 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 an 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; A processor, wherein when the computer program is executed by the processor, the air conditioner control method according to any one of claims 1 to 6 is implemented.

9. The air conditioner according to claim 8, characterized in that: The compressor is a fixed-frequency compressor.

10. 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 according to any one of claims 1 to 6.

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