Method, device and intelligent air conditioner for controlling opening degree of air conditioner expansion valve

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for controlling the opening degree of an air conditioner expansion valve. The method for controlling the opening degree of the air conditioner expansion valve comprises the following steps: in a refrigeration mode, obtaining the current operating frequency of an air conditioner compressor, the current outdoor environment temperature and the current indoor relative humidity; determining an initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature; obtaining a current humidity compensation coefficient corresponding to the current indoor relative humidity; improving the initial target exhaust temperature according to the current humidity compensation coefficient to obtain a current target exhaust temperature; and adjusting the opening degree of the air conditioner expansion valve according to the current target exhaust temperature. The method for controlling the opening degree of the air conditioner expansion valve can reduce the opening degree of the expansion valve under the control of the target exhaust temperature scheme, thereby improving the system suction superheat and the air conditioner energy efficiency. The application further discloses a device for controlling the opening degree of the air conditioner expansion valve and an intelligent air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent household appliances, for example to a method and device for controlling the opening degree of an air conditioner expansion valve and an intelligent air conditioner. BACKGROUND

[0002] An air conditioner comprises a compressor, a condenser, an expansion valve and an evaporator connected in sequence. The expansion valve can adjust the pressure difference between the condenser and the evaporator. The greater the opening degree of the expansion valve, the smaller the pressure difference between the condenser and the evaporator. The smaller the opening degree of the expansion valve, the greater the pressure difference between the condenser and the evaporator.

[0003] The control scheme of the opening degree of the expansion valve includes target superheat control and target discharge temperature control.

[0004] In the target discharge temperature control scheme, the target discharge temperature corresponding to the actual operating frequency of the compressor can be obtained as a first target discharge temperature according to the known correspondence between the current discharge temperature and the operating frequency of the compressor. Then, a set temperature compensation coefficient corresponding to the real-time outdoor ambient temperature is determined, and the sum of the first target discharge temperature and the set temperature compensation coefficient is taken as a second target discharge temperature. Finally, the opening degree of the expansion valve is adjusted to the second target discharge temperature. In this way, accurate and stable adjustment of the opening degree of the expansion valve can be realized.

[0005] In the process of implementing the embodiments of the present application, it is found that at least the following problems exist in the related art:

[0006] In the refrigeration mode, if the indoor relative humidity is large, condensate water is likely to appear on the surface of the indoor evaporator. During the condensation process of the water in the indoor air on the surface of the evaporator, heat is released, which increases the cooling load, increases the evaporation temperature and evaporation pressure of the evaporator, and increases the suction pressure and suction temperature of the compressor, thereby increasing the discharge temperature and discharge pressure of the compressor. The existing target discharge temperature control scheme of the expansion valve needs to reduce the discharge temperature of the compressor, which increases the opening degree of the expansion valve, which is likely to cause the opening degree of the expansion valve to be too large, thereby causing the suction superheat of the compressor to be too small and the energy efficiency of the air conditioner to be low. SUMMARY

[0007] The following presents a simplified summary of some aspects of the disclosed embodiments in order to provide a basic understanding of such embodiments. This summary is not an extensive overview of the embodiments described in this disclosure, and is not intended to identify key / critical elements of the embodiments or to delineate the scope of the embodiments. Its sole purpose is to present some aspects of the disclosed embodiments in a simplified form as a prelude to the more detailed description that is presented later.

[0008] The embodiments of the present application provide a method and device for controlling the opening degree of an air conditioner expansion valve and an intelligent air conditioner, so as to reduce the phenomenon of the opening degree of the expansion valve being too large in the case of large indoor relative humidity, thereby improving the energy efficiency of the air conditioner.

[0009] In some embodiments, a method for controlling the opening degree of an air conditioning expansion valve includes: in a refrigeration mode, obtaining a current operating frequency of an air conditioning compressor, a current outdoor environment temperature, and a current indoor relative humidity;

[0010] determining an initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature; determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to a corresponding relationship between indoor relative humidity and humidity compensation coefficient; increasing the initial target exhaust temperature according to the current humidity compensation coefficient to obtain a current target exhaust temperature; and adjusting the opening degree of the air conditioning expansion valve according to the current target exhaust temperature.

[0011] Optionally, the determining of the current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relationship between indoor relative humidity and humidity compensation coefficient comprises: in a case where the current indoor relative humidity is in a first relative humidity interval, determining a first humidity compensation coefficient corresponding to the first relative humidity interval as the current humidity compensation coefficient; and in a case where the current indoor relative humidity is in a second relative humidity interval, determining a second humidity compensation coefficient corresponding to the second relative humidity interval as the current humidity compensation coefficient; wherein the first relative humidity interval and the second relative humidity interval are two of a plurality of preset relative humidity intervals, an upper limit value of the first relative humidity interval is less than a lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is less than the second humidity compensation coefficient.

[0012] Optionally, in a case where the first relative humidity interval and the second relative humidity interval are two adjacent relative humidity intervals, a humidity compensation coefficient difference value and a lower limit value or an upper limit value of the first relative humidity interval or a lower limit value or an upper limit value of the second relative humidity interval are positively correlated; wherein the humidity compensation coefficient difference value is a difference value between the second humidity compensation coefficient and the first humidity compensation coefficient, and a span of each preset relative humidity interval is the same.

[0013] Optionally, the determining of the initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature comprises: obtaining a product of the current operating frequency and an exhaust temperature coefficient; determining a current temperature compensation coefficient corresponding to the current outdoor environment temperature according to a corresponding relationship between outdoor environment temperature and temperature compensation coefficient; and determining a sum of the product and the current temperature compensation coefficient as the initial target exhaust temperature.

[0014] Optionally, the increasing of the initial target exhaust temperature according to the current humidity compensation coefficient to obtain the current target exhaust temperature comprises: determining the current target exhaust temperature according to a sum of the current humidity compensation coefficient and the initial target exhaust temperature.

[0015] Optionally, the current target exhaust temperature is determined according to a sum of the current humidity compensation coefficient and the initial target exhaust temperature, including: obtaining a historical indoor relative humidity before a set time length; in a case that a relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is greater than or equal to a preset relative humidity difference, determining a quotient of the current humidity compensation coefficient and the set time length as an expected change rate; increasing the initial target exhaust temperature according to the expected change rate; and determining the increased initial target exhaust temperature as the current target exhaust temperature.

[0016] Optionally, the adjusting the opening degree of the air conditioning expansion valve according to the current target exhaust temperature includes: obtaining a current exhaust temperature of an air conditioning compressor; and adjusting the opening degree of the expansion valve according to a difference between the current exhaust temperature and the target exhaust temperature by using a control algorithm with a deviation elimination function, so that the current exhaust temperature reaches the target exhaust temperature.

[0017] In some embodiments, an apparatus for controlling an opening degree of an air conditioning expansion valve includes a first obtaining module, a first determining module, a second determining module, a second obtaining module, and an adjusting module. The first obtaining module is configured to, in a refrigeration mode, obtain a current operating frequency of an air conditioning compressor, a current outdoor environment temperature, and a current indoor relative humidity. The first determining module is configured to determine an initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature. The second determining module is configured to determine a current humidity compensation coefficient corresponding to the current indoor relative humidity according to a corresponding relationship between indoor relative humidity and humidity compensation coefficient. The second obtaining module is configured to increase the initial target exhaust temperature according to the current humidity compensation coefficient to obtain a current target exhaust temperature. The adjusting module is configured to adjust the opening degree of the air conditioning expansion valve according to the current target exhaust temperature.

[0018] In some embodiments, an apparatus for controlling an opening degree of an air conditioning expansion valve includes a processor and a memory storing program instructions. The processor is configured to execute the program instructions to perform the method for controlling the opening degree of the air conditioning expansion valve provided in the foregoing embodiments.

[0019] In some embodiments, a smart air conditioner includes the apparatus for controlling the opening degree of the air conditioning expansion valve provided in the foregoing embodiments.

[0020] The method, apparatus, and smart air conditioner for controlling the opening degree of the air conditioning expansion valve provided in the embodiments of the present application can achieve the following technical effects:

[0021] Based on the current humidity compensation coefficient corresponding to the indoor relative humidity, the target exhaust temperature is improved, so that the opening degree of the expansion valve under the control of the target exhaust temperature scheme is reduced, and the system suction superheat degree is improved, and the air conditioning energy efficiency is improved.

[0022] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and are not intended to be limiting of the application, and in which like numerals refer to like elements, and wherein:

[0024] Figure 1 is a schematic diagram of an implementation environment of a method for controlling the opening degree of an air conditioning expansion valve provided by an embodiment of the application;

[0025] Figure 2 is a flowchart of a method for controlling the opening degree of an air conditioning expansion valve provided by an embodiment of the application;

[0026] Figure 3 is a flowchart of a method for controlling the opening degree of an air conditioning expansion valve provided by an embodiment of the application;

[0027] Figure 4 is a flowchart of a method for controlling the opening degree of an air conditioning expansion valve provided by an embodiment of the application;

[0028] Figure 5 is a schematic diagram of a device for controlling the opening degree of an air conditioning expansion valve provided by an embodiment of the application;

[0029] Figure 6 is a schematic diagram of a device for controlling the opening degree of an air conditioning expansion valve provided by an embodiment of the application. DETAILED DESCRIPTION

[0030] In order to enable a person skilled in the art to more fully understand the features and technical content of the embodiments of the present application, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are used only for reference and do not limit the embodiments of the present application. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0031] The terms "first", "second", and the like in the description and claims of the application and the above drawings are used to distinguish between similar objects, and are not necessarily used to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the application described herein can be implemented in the embodiments of the application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0032] Unless otherwise specified, the term "a plurality of" means two or more.

[0033] In the embodiments of the application, the character " / " represents an "or" relationship between the objects before and after it. For example, A / B represents: A or B.

[0034] The term "and / or" is a description of the relationship between the objects, which means that there can be three relationships. For example, A and / or B, which means: A or B, or, A and B, three relationships.

[0035] Figure 1 is a schematic diagram of an implementation environment of a method for controlling the opening degree of an air conditioner expansion valve provided by the embodiments of the application, which exemplarily illustrates the hardware required for implementing the method for controlling the opening degree of an air conditioner expansion valve provided by the application. In combination with Figure 1 As shown, the air conditioner includes a compressor 11, a condenser 12, an expansion valve 13, and an evaporator 14. During the operation of the air conditioner, the refrigerant flows out of the compressor 11, and then flows through the condenser 12, the expansion valve 13, and the evaporator 14 in turn, and finally flows back to the compressor 11.

[0036] The humidity sensor 15 can be provided on the air conditioner (the air conditioner includes the humidity sensor 15), or the humidity sensor 15 is provided on other smart home appliances, for example, provided on a smart dehumidifier. Other smart home appliances can directly or indirectly communicate with the air conditioner to send the indoor relative humidity detected by the humidity sensor 15 to the air conditioner. Figure 1 The dashed line shown in the figure represents the inside of the room, and the evaporator 11 and the humidity sensor 15 are both arranged inside the room.

[0037] The controller of the air conditioner increases the target discharge temperature of the compressor 11 according to the indoor relative humidity, so that the opening degree of the expansion valve 13 is not too large, thereby increasing the suction superheat and improving the energy efficiency of the air conditioner.

[0038] Figure 2 is a flowchart of a method for controlling the opening degree of an air conditioner expansion valve provided by the embodiments of the application. The method for controlling the opening degree of an air conditioner expansion valve can be executed by the controller of the air conditioner.

[0039] In combination with Figure 2 As shown, the method for controlling the opening degree of an air conditioner expansion valve includes:

[0040] S201, in the refrigeration mode, obtaining a current operating frequency of an air conditioner compressor, a current outdoor environment temperature and a current indoor relative humidity.

[0041] The operating frequency of the air conditioner compressor can be accurately controlled by the controller of the air conditioner. At the current time, the current operating frequency of the air conditioner compressor can be obtained by reading the relevant control parameters from the controller. The outdoor environment temperature can be obtained by using the temperature sensor arranged on the outdoor unit of the air conditioner, and the current indoor relative humidity can be obtained by using the humidity sensor arranged on the indoor unit of the air conditioner.

[0042] S202, determining an initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature.

[0043] The initial target exhaust temperature herein can be a target exhaust temperature obtained according to the prior art.

[0044] In the embodiments of the present application, the initial target exhaust temperature can be determined by the following manner: obtaining a product of the current operating frequency and an exhaust temperature coefficient; determining a current temperature compensation coefficient corresponding to the current outdoor environment temperature according to a corresponding relationship between the outdoor environment temperature and the temperature compensation coefficient; and determining the sum of the product and the current temperature compensation coefficient as the initial target exhaust temperature.

[0045] The exhaust temperature coefficient refers to a correlation coefficient of the exhaust temperature of the compressor and the operating frequency of the compressor. The exhaust temperature coefficient can be obtained by relevant personnel through testing before the air conditioner is shipped and stored in a database. After the current operating frequency is obtained, the exhaust temperature coefficient can be directly read from the database, and then the product of the current operating frequency and the exhaust temperature coefficient is calculated.

[0046] The corresponding relationship between the outdoor environment temperature and the temperature compensation coefficient can be stored in the database in the form of a corresponding relationship table, which can be obtained by testing. After the current outdoor environment temperature is obtained, the temperature compensation coefficient corresponding to the current outdoor environment temperature can be obtained by querying the database.

[0047] The initial target exhaust temperature can be obtained by the above-mentioned manner.

[0048] S203, determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to a corresponding relationship between the indoor relative humidity and the humidity compensation coefficient.

[0049] The corresponding relationship between the indoor relative humidity and the humidity compensation coefficient can be stored in the database in the form of a corresponding relationship table. After the current indoor relative humidity is obtained, the current humidity compensation coefficient corresponding to the current indoor relative humidity can be obtained by querying the database.

[0050] In the corresponding form of indoor relative humidity and humidity compensation coefficient, one indoor relative humidity can correspond to one humidity compensation coefficient, or multiple indoor relative humidity can correspond to one humidity compensation coefficient. Regardless of which corresponding form is adopted, the following relationship needs to be ensured: the greater the indoor relative humidity, the greater the humidity compensation coefficient.

[0051] Optionally, according to the corresponding relationship between indoor relative humidity and humidity compensation coefficient, determining the current humidity compensation coefficient corresponding to the current indoor relative humidity can include: in the case that the current indoor relative humidity is in a first relative humidity interval, determining a first humidity compensation coefficient corresponding to the first relative humidity interval as the current humidity compensation coefficient; in the case that the current indoor relative humidity is in a second relative humidity interval, determining a second humidity compensation coefficient corresponding to the second relative humidity interval as the current humidity compensation coefficient; wherein the first relative humidity interval and the second relative humidity interval are two of a plurality of preset relative humidity intervals, the upper limit value of the first relative humidity interval is less than the lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is less than the second humidity compensation coefficient.

[0052] The first relative humidity interval and the second relative humidity interval can be continuous or not continuous.

[0053] The plurality of preset relative humidity intervals are divided by a plurality of humidity thresholds, each preset relative humidity interval corresponds to a humidity compensation coefficient, and the corresponding relationship can be pre-stored in a database. After determining the preset relative humidity interval in which the current indoor relative humidity is located, the current humidity compensation coefficient corresponding to the current indoor relative humidity can be obtained by querying the database.

[0054] The plurality of preset relative humidity intervals can be divided by a plurality of humidity thresholds. The number of humidity thresholds can be two, three, four or more, which is not limited here. The plurality of humidity thresholds are all valued in a preset relative humidity range. The upper limit value of the preset relative humidity range can be 70%, 80% or 90%, and the lower limit value of the preset relative humidity range can be 10%, 20%, 30%, 40%, 50% or 60%.

[0055] By adopting the above technical solution, the current humidity compensation coefficient corresponding to the current indoor relative humidity can be obtained.

[0056] In some application scenarios, the corresponding relationship between the preset relative humidity interval and the humidity compensation coefficient can be as shown in Table 1.

[0057] Table 1 Corresponding relationship between relative humidity interval and humidity compensation coefficient

[0058] Predefined relative humidity interval Below a % From a % to b % From b % to c % From c % to d % Above d % Humidity compensation factor D1 D2 D3 D4 D5

[0059] In Table 1, the relationship of the four humidity thresholds a%, b%, c% and d% is a% < b% < c% < d%, and the relationship of the five humidity compensation coefficients D1, D2, D3, D4 and D5 is D1 < D2 < D3 < D4 < D5. After obtaining the current indoor relative humidity, the size relationship of the current indoor relative humidity and the four humidity thresholds is compared, and then the preset relative humidity interval in which the current relative humidity is located is determined, and finally the current humidity compensation coefficient corresponding to the current relative humidity is obtained.

[0060] After considering the critical point, the above preset relative humidity intervals can be in turn [0, a%], (a%, b%], (b%, c%], (c%, d%] and (d%, 100]; or the above preset relative humidity intervals can be in turn [0, a%), [a%, b%), [b%, c%), [c%, d%) and [d%, 100].

[0061] Corresponding to the foregoing embodiments, in the case of the first relative humidity interval being a% or less, the second relative humidity interval can be a% to b%, b% to c%, c% to d% or d% or more; in the case of the first relative humidity interval being a% to b%, the second relative humidity interval can be b% to c%, c% to d% or d% or more; in the case of the first relative humidity interval being b% to c%, the second relative humidity interval can be c% to d% or d% or more; in the case of the first relative humidity interval being c% to d%, the second relative humidity interval can be d% or more.

[0062] Further, in the case of the first relative humidity interval and the second relative humidity interval being two adjacent relative humidity intervals, the humidity compensation coefficient difference value is positively correlated with the lower limit value of the first relative humidity interval, or the humidity compensation coefficient difference value is positively correlated with the upper limit value of the first relative humidity interval, or the humidity compensation coefficient difference value is positively correlated with the lower limit value of the second relative humidity interval, or the humidity compensation coefficient difference value is positively correlated with the upper limit value of the second relative humidity interval. The humidity compensation coefficient difference value is the difference between the second humidity compensation coefficient and the first humidity compensation coefficient, and the span of each preset relative humidity interval is the same. The higher the indoor relative humidity, the greater the probability of condensation of water in the air on the indoor evaporator, and the greater the refrigeration load brought by the evaporator. At this time, the target exhaust temperature is compensated more, which can improve the target exhaust temperature in the case of a large cold load brought by the indoor relative humidity, and then reduce the expansion valve opening degree to avoid the suction gas superheat being too low and improve the air conditioning energy efficiency.

[0063] Still taking the foregoing application scenario as an example for example description, in the case that the first relative humidity interval is below a%, and the second relative humidity interval is a% to b%, the humidity compensation coefficient difference value is △D1=D2-D1; in the case that the first relative humidity interval is a% to b% below, and the second relative humidity interval is b% to c%, the humidity compensation coefficient difference value is △D2=D3-D2; in the case that the first relative humidity interval is b% to c%, and the second relative humidity interval is c% to d%, the humidity compensation coefficient difference value is △D3=D4-D3; in the case that the first relative humidity interval is c% to d%, and the second relative humidity interval is d% above, the humidity compensation coefficient difference value is △D4=D5-D4; wherein, △D1<△D2<△D3<△D4.

[0064] By adopting the technical solution, the current relative humidity compensation coefficient can be obtained.

[0065] S204, increasing the initial target exhaust temperature according to the current humidity compensation coefficient to obtain a current target exhaust temperature.

[0066] In this step, the initial target exhaust temperature is increased based on the current humidity compensation coefficient, and then in the process of controlling the expansion valve opening degree according to the current target exhaust temperature, the expansion valve opening degree is reduced to reduce the phenomenon of low suction superheat degree and low air conditioning energy efficiency caused by the expansion valve opening degree being too large.

[0067] Optionally, increasing the initial target exhaust temperature according to the current humidity compensation coefficient to obtain a current target exhaust temperature comprises: determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature. For example, the sum of the current humidity compensation coefficient and the initial target exhaust temperature can be determined as the current target exhaust temperature, so that a numerical and accurate current target exhaust temperature for controlling the expansion valve opening degree can be obtained.

[0068] Alternatively, determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature can comprise: obtaining a historical indoor relative humidity before a set time length; in the case that the relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is greater than or equal to a preset relative humidity difference, determining the quotient of the current humidity compensation coefficient and the set time length as an expected change rate; increasing the initial target exhaust temperature at the expected change rate until the initial target exhaust temperature is increased to the sum of the current humidity compensation coefficient and the initial target exhaust temperature; and determining the increased initial target exhaust temperature as the current target exhaust temperature.

[0069] The set time length can be 5 minutes, 7 minutes, 10 minutes, 15 minutes or 20 minutes.

[0070] The preset relative humidity difference reflects a variation range of the target discharge temperature of the compressor, and the preset relative humidity difference can be determined in the following manner: a preset relative humidity difference corresponding to a preset compensation coefficient is obtained according to a corresponding relationship between the indoor relative humidity and the humidity compensation coefficient, and the preset compensation coefficient can be 1 ℃, 2 ℃, 3 ℃, 4 ℃ or 5 ℃.

[0071] Alternatively, the preset relative humidity difference can be determined in the following manner: a difference between the current humidity compensation coefficient and the preset compensation coefficient is determined as a first humidity compensation coefficient; a first indoor relative humidity corresponding to the first compensation coefficient is obtained according to a difference between the indoor relative humidity and the humidity compensation coefficient, and a difference between the current indoor relative humidity and the first indoor relative humidity is determined as the preset relative humidity difference.

[0072] The quotient of the current humidity compensation coefficient and the set time length, which is determined as the expected variation rate, can be a quotient of the current humidity compensation coefficient divided by the set time length, which is determined as the expected variation rate.

[0073] The initial target discharge temperature is increased at the expected variation rate until the initial target discharge temperature is increased to a sum of the current humidity compensation coefficient and the initial target discharge temperature, and the increased initial target discharge temperature is determined as the current target discharge temperature, which can specifically be:

[0074] T s = T s + △T × t

[0075] wherein T i is the current target discharge temperature, a maximum value of T is a sum of the current humidity compensation coefficient and the initial target discharge temperature, T

[0001] is the initial target discharge temperature, △T is the expected variation rate, and t is a time length from a time point when the expected variation rate is determined to a current time point.

[0076] Further, after the current target discharge temperature is determined in the above manner, the current indoor relative humidity and the historical indoor relative humidity before the set time length are still obtained in real time; in a case where a relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is less than the preset relative humidity difference, and the current target discharge temperature is less than a sum of the current humidity compensation coefficient and the initial target discharge temperature, the current humidity compensation coefficient is maintained unchanged.

[0077] In this way, in the case that the indoor environment temperature decreases too fast, the indoor relative humidity changes greatly within the set time length, and the great indoor relative humidity has an influence on the evaporator and needs a certain time length; compared with the scheme of determining the current target exhaust temperature as the sum of the initial target exhaust temperature and the current humidity compensation coefficient, the current target exhaust temperature determined according to the above technical scheme can be slowly increased, so that the current target exhaust temperature is relatively consistent with the increase amount of the air conditioning refrigeration load caused by the change of the indoor relative humidity, the expansion valve can be more accurately adjusted, the phenomenon of the expansion valve opening being too large or too small is reduced, and the air conditioning energy efficiency is improved.

[0078] Further, the set time length is the time length between the time when the indoor relative humidity changes and the time when the refrigeration rate of the air conditioner increases, and the set time length can be obtained through experiments. In this way, the increase speed of the current target exhaust temperature is more adapted to the influence of the change of the indoor relative humidity on the refrigeration rate of the air conditioner, and the phenomenon of the suction superheat being too low or too high caused by the expansion valve opening being too large or too small is further reduced, and the air conditioning energy efficiency is improved.

[0079] The above scheme can be used to obtain the current target exhaust temperature.

[0080] S205, adjusting the opening of the expansion valve of the air conditioner according to the current target exhaust temperature.

[0081] obtaining the current exhaust temperature of the air conditioner compressor, increasing the opening of the expansion valve in the case that the current exhaust temperature is higher than the target exhaust temperature, and decreasing the opening of the expansion valve in the case that the current exhaust temperature is lower than the target exhaust temperature.

[0082] Further, adjusting the opening of the expansion valve of the air conditioner according to the current target exhaust temperature can include: obtaining the current exhaust temperature of the air conditioner compressor; and adjusting the opening of the expansion valve by using a control algorithm with a deviation elimination function according to the difference between the current exhaust temperature and the target exhaust temperature, so that the current exhaust temperature reaches the target exhaust temperature.

[0083] The control algorithm with the deviation elimination function can be a proportion-integral-differential (PID) algorithm, and can also be a linear quadratic regulator (LQR). In this way, the opening of the expansion valve can be more accurately adjusted.

[0084] In the technical scheme provided in the embodiments of the present application, the current target discharge temperature is improved based on the current humidity compensation coefficient corresponding to the indoor relative humidity. In the case of large indoor relative humidity, the water vapor in the indoor air condenses on the surface of the evaporator to form condensed water and release heat, thereby improving the refrigeration load of the air conditioner. At this time, the evaporator temperature and the evaporating pressure of the evaporator are increased, and the actual suction temperature and the actual discharge temperature of the compressor are increased. In the case of large indoor relative humidity, the current target discharge temperature is increased based on the current humidity compensation coefficient corresponding to the indoor relative humidity, that is, the actual discharge temperature of the compressor is increased at the same time as the current target discharge temperature. At this time, the difference between the current target discharge temperature and the actual discharge temperature is not too large. When the temperature difference between the target discharge temperature and the actual discharge temperature is eliminated by adjusting the opening degree of the expansion valve, the opening degree of the expansion valve is not adjusted too large. Thus, the phenomenon of small suction superheat degree and low air conditioner energy efficiency caused by too large expansion valve opening degree is improved, and finally the air conditioner energy efficiency is improved.

[0085] Figure 3 is a flowchart of a method for controlling the opening degree of an expansion valve of an air conditioner provided in the embodiments of the present application. The method for controlling the opening degree of the expansion valve of the air conditioner can be executed by a controller of the air conditioner.

[0086] In combination with Figure 3 , the method for controlling the opening degree of the expansion valve of the air conditioner includes the following steps.

[0087] S301, in a refrigeration mode, obtaining a current indoor relative humidity.

[0088] S302, determining whether the current indoor relative humidity is greater than a minimum humidity threshold value; if yes, performing S303; otherwise, performing S301.

[0089] The minimum humidity threshold value can be 45%, 50%, 55%, 60% or 65%.

[0090] S303, obtaining a current operating frequency of a compressor of the air conditioner and a current outdoor environment temperature.

[0091] S304, determining an initial target discharge temperature according to the current operating frequency and the current outdoor environment temperature.

[0092] S305, determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to a corresponding relationship between the indoor relative humidity and the humidity compensation coefficient.

[0093] S306, improving the initial target discharge temperature according to the current humidity compensation coefficient to obtain a current target discharge temperature.

[0094] S307, adjusting the opening degree of the expansion valve of the air conditioner according to the current target discharge temperature.

[0095] Figure 4 is a flowchart of a method for controlling an opening degree of an expansion valve of an air conditioner provided by an embodiment of the present application. The method for controlling the opening degree of the expansion valve of the air conditioner can be executed by a controller of the air conditioner.

[0096] With reference to Figure 4 As shown in the figure, the method for controlling the opening degree of the expansion valve of the air conditioner comprises:

[0097] S401, in a refrigeration mode, obtaining a current operating frequency of a compressor of the air conditioner, a current outdoor ambient temperature, and a current indoor relative humidity.

[0098] S402, determining an initial target discharge temperature according to the current operating frequency and the current outdoor ambient temperature.

[0099] S403, determining a current relative humidity range in which the current indoor relative humidity is located, from among a plurality of preset relative humidity ranges.

[0100] S404, determining a humidity compensation coefficient corresponding to the current relative humidity range as a current humidity compensation coefficient corresponding to the current indoor relative humidity.

[0101] S405, improving the initial target discharge temperature according to the current humidity compensation coefficient to obtain a current target discharge temperature.

[0102] S406, adjusting the opening degree of the expansion valve of the air conditioner according to the current target discharge temperature.

[0103] Figure 5 is a schematic diagram of a device for controlling an opening degree of an expansion valve of an air conditioner provided by an embodiment of the present application.

[0104] With reference to Figure 5 As shown in the figure, the device for controlling the opening degree of the expansion valve of the air conditioner comprises a first obtaining module 51, a first determining module 52, a second determining module 53, a second obtaining module 54, and an adjusting module 55; the first obtaining module 51 is configured to, in a refrigeration mode, obtain a current operating frequency of a compressor of the air conditioner, a current outdoor ambient temperature, and a current indoor relative humidity; the first determining module 52 is configured to determine an initial target discharge temperature according to the current operating frequency and the current outdoor ambient temperature; the second determining module 53 is configured to determine a current humidity compensation coefficient corresponding to the current indoor relative humidity according to a correspondence between indoor relative humidity and humidity compensation coefficient; the second obtaining module 54 is configured to improve the initial target discharge temperature according to the current humidity compensation coefficient to obtain a current target discharge temperature; and the adjusting module 55 is configured to adjust the opening degree of the expansion valve of the air conditioner according to the current target discharge temperature.

[0105] Optionally, the second determining module 53 comprises a first determining unit and a second determining unit, the first determining unit is configured to determine the first humidity compensation coefficient corresponding to the first relative humidity interval as the current humidity compensation coefficient in the case that the current indoor relative humidity is in the first relative humidity interval; the second determining unit is configured to determine the second humidity compensation coefficient corresponding to the second relative humidity interval as the current humidity compensation coefficient in the case that the current indoor relative humidity is in the second relative humidity interval; wherein the first relative humidity interval and the second relative humidity interval are two of the plurality of preset relative humidity intervals, the upper limit value of the first relative humidity interval is less than the lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is less than the second humidity compensation coefficient.

[0106] Optionally, in the case that the first relative humidity interval and the second relative humidity interval are two adjacent relative humidity intervals, the humidity compensation coefficient difference value is positively correlated with the lower limit value or the upper limit value of the first relative humidity interval, or the lower limit value or the upper limit value of the second relative humidity interval; wherein the humidity compensation coefficient difference value is the difference value between the second humidity compensation coefficient and the first humidity compensation coefficient, and the span of each preset relative humidity interval is the same.

[0107] Optionally, the first determining module 52 comprises a first obtaining unit, a third determining unit and a fourth determining unit, the first obtaining unit is configured to obtain the product of the current operating frequency and the exhaust temperature coefficient; the third determining unit is configured to determine the current temperature compensation coefficient corresponding to the current outdoor environment temperature according to the corresponding relationship between the outdoor environment temperature and the temperature compensation coefficient; and the fourth determining unit is configured to determine the sum of the product and the current temperature compensation coefficient as the initial target exhaust temperature.

[0108] Optionally, the second obtaining module 54 is specifically configured to determine the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature.

[0109] Optionally, the second obtaining module 54 comprises a second obtaining unit, a fifth determining unit, an increasing unit and a sixth determining unit, the second obtaining unit is configured to obtain the historical indoor relative humidity before the set time length; the fifth determining unit is configured to determine the quotient of the current humidity compensation coefficient and the set time length as the expected change rate in the case that the relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is greater than or equal to the preset relative humidity difference; the increasing unit is configured to increase the initial target exhaust temperature at the expected change rate until the sum of the current humidity compensation coefficient and the initial target exhaust temperature; and the sixth determining unit is configured to determine the initial target exhaust temperature after the increase as the current target exhaust temperature.

[0110] Optionally, the adjusting module 53 comprises a third obtaining unit and a control unit, the third obtaining unit is configured to obtain a current exhaust temperature of the air conditioner compressor; the control unit is configured to adjust the opening degree of the expansion valve by using a control algorithm with a deviation elimination function according to a difference between the current exhaust temperature and the target exhaust temperature, so that the current exhaust temperature reaches the target exhaust temperature.

[0111] In some embodiments, the device for controlling the opening degree of the expansion valve of the air conditioner comprises a processor and a memory storing program instructions, the processor is configured to execute the method for controlling the opening degree of the expansion valve of the air conditioner provided in the foregoing embodiments when executing the program instructions.

[0112] Figure 6 is a schematic diagram of a device for controlling the opening degree of the expansion valve of the air conditioner provided in an embodiment of the present application. As shown in Figure 6 The device for controlling the opening degree of the expansion valve of the air conditioner comprises:

[0113] The processor 61 and the memory 62 can also include a communication interface 63 and a bus 64. The processor 61, the communication interface 63 and the memory 62 can communicate with each other through the bus 64. The communication interface 63 can be used for information transmission. The processor 61 can call the logical instructions in the memory 62 to execute the method for controlling the opening degree of the expansion valve of the air conditioner provided in the foregoing embodiments.

[0114] In addition, the logical instructions in the memory 62 described above can be implemented in the form of a software function unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0115] The memory 62 as a computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiments of the present application. The processor 61 executes the functions and data processing by running the software programs, instructions and modules stored in the memory 62, that is, implements the method in the foregoing method embodiments.

[0116] The memory 62 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required by a function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 62 can include a high-speed random access memory and can also include a non-volatile memory.

[0117] The embodiments of the present application provide an intelligent air conditioner comprising the device for controlling the opening degree of the expansion valve of the air conditioner provided in the foregoing embodiments.

[0118] The embodiment of the present application provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are configured to execute the method for controlling the opening degree of the expansion valve of the air conditioner provided by the foregoing embodiment.

[0119] The embodiment of the present application provides a computer program product, which comprises a computer program stored on a computer readable storage medium, and the computer program comprises program instructions, and when the program instructions are executed by a computer, the computer executes the method for controlling the opening degree of the expansion valve of the air conditioner provided by the foregoing embodiment.

[0120] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0121] The technical scheme of the embodiment of the present application can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method in the embodiment of the present application. The foregoing storage medium can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes, or can be a transitory storage medium.

[0122] The above description and drawings are illustrative of embodiments of the application and are not to be construed as limiting the application. Other embodiments can include structural, logical, electrical, process, and other changes. The embodiments are merely examples of the many possible embodiments of the application. Unless explicitly stated otherwise, individual components and functions are optional and the order of operations can vary. Parts and features of some embodiments can be included or replaced in or by parts and features of other embodiments. Also, the word "comprising" and variations thereof, as used in the claims, mean "including but not limited to" and are not intended to exclude other moieties, constituents, steps, or elements. Unless otherwise expressly stated, the use of one or more adjectives or other modifiers in describing an embodiment does not limit the scope of that embodiment to only those items or characteristics being described. Nor does the use of the term "comprising" or "including," or variations thereof, in the claims mean that the scope of the application is not further limited to only the elements or steps described. The word "a" or "an" used in the claims means "one or more" unless otherwise expressly stated. The word "another" used in the claims means "at least a second or one or more" unless otherwise expressly stated. The word "comprise" and variations thereof, as used in the claims, do not exclude the presence of additional elements or steps. Where the disclosure of an embodiment includes "comprising," "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," "or the like," the term "comprising" means "including, but not limited to," and the terms "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," or the like are not used as the only restrictions on the meaning of "comprising." Unless otherwise expressly stated, the use of the term "or" in the claims does not require that alternatives be mutually exclusive. The word "about" used in the claims means "approximately," "around," "nearly," "substantially," or "nearly exactly," unless otherwise expressly stated. The word "substantially" used in the claims means "approximately," "around," "nearly," "about," or "nearly exactly," unless otherwise expressly stated. The word "comprise" and variations thereof, as used in the claims, do not exclude the presence of additional elements or steps. Where the disclosure of an embodiment includes "comprising," "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," "or the like," the term "comprising" means "including, but not limited to," and the terms "containing," "having," "including," "carrying," "housing," "composed of," "made of," "manufactured from," or the like are not used as the only restrictions on the meaning of "comprising." Unless otherwise expressly stated, the use of the term "or" in the claims does not require that alternatives be mutually exclusive. The word "about" used in the claims means "approximately," "around," "nearly," "substantially," or "nearly exactly," unless otherwise expressly stated. The word "substantially" used in the claims means "approximately," "around," "nearly," "about," or "nearly exactly," unless otherwise expressly stated.

[0123] Those skilled in the art can understand that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized in electronic hardware or in a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of the present application. Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0124] The disclosed method, product (including but not limited to device, equipment, etc.) in the embodiments disclosed in the present document can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units can be merely a logical function division. In actual implementation, another division manner can be used. For example, a plurality of units or components can be combined or integrated into another system, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms. The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the embodiments. In addition, the functional units in the embodiments of the present application can be integrated in one processing unit, or each unit can be a physical unit, or two or more units can be integrated in one unit.

[0125] The flowcharts and block diagrams in the drawings show the possible implementation architecture, function and operation of the system, method and computer program product according to the embodiments of the present application. In this regard, each block in the flowchart or block diagram can represent a module, program segment or part of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks can occur in different orders than those noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes in reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

Claims

1. A method for controlling the opening degree of an air conditioning expansion valve, characterized in that, include: In cooling mode, obtain the current operating frequency of the air conditioner compressor, the current outdoor ambient temperature, and the current indoor relative humidity; The initial target exhaust temperature is determined based on the current operating frequency and the current outdoor ambient temperature. Based on the correspondence between indoor relative humidity and humidity compensation coefficient, determine the current humidity compensation coefficient corresponding to the current indoor relative humidity; To obtain the current target exhaust temperature by increasing the initial target exhaust temperature according to the current humidity compensation coefficient, the method includes: determining the current target exhaust temperature based on the sum of the current humidity compensation coefficient and the initial target exhaust temperature; The current target exhaust temperature is determined based on the sum of the current humidity compensation coefficient and the initial target exhaust temperature, including: obtaining the historical indoor relative humidity before a set time period; if the relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is greater than or equal to a preset relative humidity difference, determining the quotient of the current humidity compensation coefficient and the set time period as the expected rate of change; increasing the initial target exhaust temperature according to the expected rate of change; and determining the increased initial target exhaust temperature as the current target exhaust temperature. Adjust the opening of the air conditioning expansion valve according to the current target exhaust temperature.

2. The method according to claim 1, characterized in that, The step of determining the current humidity compensation coefficient corresponding to the current indoor relative humidity based on the correspondence between indoor relative humidity and humidity compensation coefficient includes: When the current indoor relative humidity is within a first relative humidity range, the first humidity compensation coefficient corresponding to the first relative humidity range is determined as the current humidity compensation coefficient; When the current indoor relative humidity is within the second relative humidity range, the second humidity compensation coefficient corresponding to the second relative humidity range is determined as the current humidity compensation coefficient; Wherein, the first relative humidity range and the second relative humidity range are two of a plurality of preset relative humidity ranges, the upper limit of the first relative humidity range is less than the lower limit of the second relative humidity range, and the first humidity compensation coefficient is less than the second humidity compensation coefficient.

3. The method according to claim 2, characterized in that, When the first relative humidity range and the second relative humidity range are two adjacent relative humidity ranges, the difference in humidity compensation coefficients is positively correlated with the lower limit or upper limit of the first relative humidity range, or the lower limit or upper limit of the second relative humidity range; wherein, the difference in humidity compensation coefficients is the difference between the second humidity compensation coefficient and the first humidity compensation coefficient, and the span of each preset relative humidity range is the same.

4. The method according to any one of claims 1 to 3, characterized in that, The step of determining the initial target exhaust temperature based on the current operating frequency and the current outdoor ambient temperature includes: Obtain the product of the current operating frequency and the exhaust temperature coefficient; Based on the correspondence between outdoor ambient temperature and temperature compensation coefficient, determine the current temperature compensation coefficient corresponding to the current outdoor ambient temperature; The sum of the product and the current temperature compensation coefficient is determined as the initial target exhaust temperature.

5. The method according to any one of claims 1 to 3, characterized in that, The step of adjusting the opening of the air conditioning expansion valve according to the current target exhaust temperature includes: Obtain the current exhaust temperature of the air conditioner compressor; Based on the difference between the current exhaust temperature and the current target exhaust temperature, a control algorithm with deviation elimination function is used to adjust the opening of the expansion valve so that the current exhaust temperature reaches the current target exhaust temperature.

6. A device for controlling the opening degree of an expansion valve in an air conditioning system, characterized in that, include: The first acquisition module is configured to acquire, in cooling mode, the current operating frequency of the air conditioner compressor, the current outdoor ambient temperature, and the current indoor relative humidity. The first determining module is configured to determine the initial target exhaust temperature based on the current operating frequency and the current outdoor ambient temperature. The second determining module is configured to determine the current humidity compensation coefficient corresponding to the current indoor relative humidity based on the correspondence between indoor relative humidity and humidity compensation coefficient. The second obtaining module is configured to increase the initial target exhaust temperature according to the current humidity compensation coefficient to obtain the current target exhaust temperature, including: determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature; determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature includes: obtaining the historical indoor relative humidity before a set time period; if the relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is greater than or equal to a preset relative humidity difference, determining the quotient of the current humidity compensation coefficient and the set time period as the expected rate of change; increasing the initial target exhaust temperature according to the expected rate of change; and determining the increased initial target exhaust temperature as the current target exhaust temperature. The adjustment module is configured to adjust the opening of the air conditioning expansion valve according to the current target exhaust temperature.

7. A device for controlling the opening degree of an air conditioning expansion valve, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for controlling the opening of an air conditioning expansion valve as described in any one of claims 1 to 5.

8. A smart air conditioner, characterized in that, Includes the device for controlling the opening degree of the air conditioning expansion valve as described in claim 6 or 7.

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