CN116242005A

CN116242005A - Method and device for controlling opening degree of expansion valve of air conditioner and intelligent air conditioner

Info

Publication number: CN116242005A
Application number: CN202111516220.6A
Authority: CN
Inventors: 田志强; 李婧; 魏伟; 高平; 聂圣源; 冯承文
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2023-06-09

Abstract

The application relates to the technical field of intelligent household appliances and discloses a method for controlling the opening degree of an expansion valve of an air conditioner. The method for controlling the opening degree of the expansion valve of the air conditioner comprises the following steps: in the refrigeration mode, obtaining a current operating frequency, a current outdoor ambient temperature and a current indoor relative humidity of an air conditioner compressor; 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; the initial target exhaust temperature is increased according to the current humidity compensation coefficient, and the current target exhaust temperature is obtained; and adjusting the opening degree of the expansion valve of the air conditioner according to the current target exhaust temperature. By adopting the method for controlling the opening of the expansion valve of the air conditioner, the opening of the expansion valve under the control of the target exhaust temperature scheme can be reduced, so that the air suction superheat degree of the system is improved, and the energy efficiency of the air conditioner is improved. The application also discloses a device for controlling the opening degree of the expansion valve of the air conditioner and an intelligent air conditioner.

Description

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

Technical Field

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

Background

The air conditioner comprises a compressor, a condenser, an expansion valve and an evaporator which are sequentially connected, wherein the expansion valve can adjust the pressure difference between the condenser and the evaporator, the larger the opening of the expansion valve is, the smaller the pressure difference between the condenser and the evaporator is, and the smaller the opening of the expansion valve is, the larger the pressure difference between the condenser and the evaporator is.

The control scheme of the expansion valve opening degree includes target superheat degree control and target exhaust gas temperature control.

In the target exhaust gas temperature control scheme, the target exhaust gas temperature corresponding to the implementation operating frequency of the compressor can be obtained according to the known corresponding relation between the current exhaust gas temperature and the compressor operating frequency to be used as a first target exhaust gas temperature, then a set temperature compensation coefficient corresponding to the real-time outdoor environment temperature is determined, the sum of the first target exhaust gas temperature and the set temperature compensation coefficient is used as a second target exhaust gas temperature, and finally the opening degree of the expansion valve is adjusted to the second target exhaust gas temperature according to the opening degree of the expansion valve. Thus, the opening degree of the expansion valve can be accurately and stably adjusted.

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

in the refrigeration mode, if the indoor relative humidity is large, condensed water is easy to appear on the surface of an indoor evaporator, water in indoor air releases heat in the surface condensation process of the evaporator, so that the cold load becomes large, the evaporation temperature and the evaporation pressure of the evaporator are improved, the suction pressure and the suction temperature of a compressor are improved, the discharge temperature and the discharge pressure of the compressor are further improved, the discharge temperature of the compressor is required to be reduced by the existing target discharge temperature control scheme of the expansion valve, the opening of the expansion valve is improved, and the situation that the opening of the expansion valve is too large, the suction superheat degree of the compressor is too small, and the air conditioning energy efficiency is low is easily caused.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the application provides a method and device for controlling the opening of an expansion valve of an air conditioner and an intelligent air conditioner, so that the phenomenon that the opening of the expansion valve is overlarge is reduced under the condition that the indoor relative humidity is large, and the energy efficiency of the air conditioner is improved.

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

determining an initial target discharge temperature according to the current operating frequency and the current outdoor ambient temperature; determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient; the initial target exhaust temperature is increased according to the current humidity compensation coefficient, and the current target exhaust temperature is obtained; and adjusting the opening degree of the expansion valve of the air conditioner according to the current target exhaust temperature.

Optionally, the determining the current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient includes: determining a first humidity compensation coefficient corresponding to a first relative humidity interval as the current humidity compensation coefficient when the current indoor relative humidity is in the first relative humidity interval; determining a second humidity compensation coefficient corresponding to a second relative humidity interval as the current humidity compensation coefficient when the current indoor relative humidity is in the second relative humidity interval; 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 smaller than the lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is smaller than the second humidity compensation coefficient.

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; the humidity compensation coefficient difference value is the difference value between the second humidity compensation coefficient and the first humidity compensation coefficient, and the spans of all preset relative humidity intervals are the same.

Optionally, the determining the initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature includes: obtaining the product of the current operating frequency and the exhaust temperature coefficient; determining a current temperature compensation coefficient corresponding to the current outdoor environment temperature according to the corresponding relation 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 gas temperature.

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

Optionally, determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature includes: acquiring the relative humidity in a history room before a set time length; determining the quotient of the current humidity compensation coefficient and the set duration as an expected change rate under the condition that the relative humidity difference value between the current indoor relative humidity and the historical indoor relative humidity is larger than or equal to a preset relative humidity difference value; increasing the initial target exhaust temperature at the desired rate of change; and determining the increased initial target exhaust temperature as the current target exhaust temperature.

Optionally, the adjusting the opening of the expansion valve of the air conditioner according to the current target exhaust temperature includes: obtaining the current exhaust temperature of an air conditioner compressor; and adjusting the opening degree of the expansion valve by adopting a control algorithm with a deviation elimination function according to the difference value between the current exhaust temperature and the target exhaust temperature so as to enable the current exhaust temperature to reach the target exhaust temperature.

In some embodiments, an apparatus for controlling an opening degree of an expansion valve of an air conditioning system includes a first obtaining module configured to obtain a current operating frequency of an air conditioning compressor, a current outdoor ambient temperature, and a current indoor relative humidity in a cooling mode, a first determining module, a second obtaining module, and an adjusting module; the first determination module is configured to determine an initial target discharge temperature based on the current operating frequency and the current outdoor ambient temperature; the second determining module is configured to determine a current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the 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 adjustment module is configured to adjust an opening degree of an air conditioner expansion valve according to the current target exhaust gas temperature.

In some embodiments, an apparatus for controlling an opening degree of an expansion valve of an air conditioner includes a processor and a memory storing program instructions, the processor being configured to execute the method for controlling an opening degree of an expansion valve of an air conditioner provided in the foregoing embodiments when executing the program instructions.

In some embodiments, the intelligent air conditioner comprises the device for controlling the opening degree of the expansion valve of the air conditioner provided by the previous embodiment.

The method and the device for controlling the opening of the expansion valve of the air conditioner and the intelligent air conditioner provided by the embodiment of the application can realize the following technical effects:

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, the air suction superheat degree of the system is improved, and the air conditioning energy efficiency is improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which:

Fig. 1 is a schematic diagram of an implementation environment of a method for controlling an opening degree of an expansion valve of an air conditioner according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a method for controlling the opening of an expansion valve of an air conditioner according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a method for controlling the opening of an expansion valve of an air conditioner according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a method for controlling the opening of an expansion valve of an air conditioner according to an embodiment of the present application;

fig. 5 is a schematic diagram of an apparatus for controlling an opening degree of an expansion valve of an air conditioner according to an embodiment of the present application;

fig. 6 is a schematic diagram of an apparatus for controlling an opening degree of an expansion valve of an air conditioner according to an embodiment of the present application.

Detailed Description

For a more complete understanding of the features and technical content of the embodiments of the present application, reference should be made to the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings, which are for purposes of illustration only and not intended to limit the embodiments of the present application. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present application described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present application, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

Fig. 1 is a schematic diagram of an implementation environment of a method for controlling an opening degree of an expansion valve of an air conditioner according to an embodiment of the present application, and exemplary description is given of hardware required for implementing the method for controlling an opening degree of an expansion valve of an air conditioner according to the present application. As shown in connection with fig. 1, 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, then flows through the condenser 12, the expansion valve 13 and the evaporator 14 in order, and finally flows back to the compressor 11.

The humidity sensor 15 may be disposed on an air conditioner (the air conditioner includes the humidity sensor 15), or the humidity sensor 15 may be disposed on other intelligent home appliances, such as a smart dehumidifier, which may directly or indirectly communicate with the air conditioner to transmit the indoor relative humidity detected by the humidity sensor 15 to the air conditioner. The broken line shown in fig. 1 indicates the inside of a room, and the evaporator 11 and the humidity sensor 15 are both disposed inside the room.

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

Fig. 2 is a schematic flow chart of a method for controlling the opening of an expansion valve of an air conditioner according to an embodiment of the present application. The method for controlling the opening degree of the expansion valve of the air conditioner may be performed by a controller of the air conditioner.

As shown in fig. 2, the method for controlling the opening degree of the expansion valve of the air conditioner includes:

s201, in the cooling mode, a current operating frequency of the air conditioner compressor, a current outdoor environment temperature, and a current indoor relative humidity are obtained.

The running frequency of the air conditioner compressor can be precisely controlled by the controller of the air conditioner, and the current running frequency of the air conditioner compressor can be obtained by reading the relevant control parameters from the controller at the current moment. The outdoor environment temperature can be obtained by using a temperature sensor arranged on the air conditioner outdoor unit, and the current indoor relative humidity can be obtained by using a humidity sensor arranged on the air conditioner indoor unit.

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

The initial target exhaust temperature here may be a target exhaust temperature obtained according to the prior art.

In the present embodiment, the initial target exhaust gas temperature may be determined by: obtaining the product of the current operating frequency and the exhaust temperature coefficient; determining a current temperature compensation coefficient corresponding to the current outdoor environment temperature according to the corresponding relation between the outdoor environment temperature and the temperature compensation coefficient; the sum of the product and the current temperature compensation coefficient is determined as the initial target exhaust gas temperature.

The exhaust temperature coefficient refers to a coefficient of correlation between the exhaust temperature of the compressor and the operating frequency of the compressor, and can be obtained by testing by related personnel before the air conditioner leaves the factory 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.

The corresponding relation between the outdoor environment temperature and the temperature compensation coefficient can be stored in a database in the form of a corresponding relation table, and the corresponding relation table can be obtained through experiments. After the current outdoor environment temperature is obtained, the temperature compensation coefficient corresponding to the current outdoor environment temperature can be obtained by inquiring the database.

The initial target exhaust temperature can be obtained through the mode.

S203, determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient.

The corresponding relation between the indoor relative humidity and the humidity compensation coefficient can be stored in a database in the form of a corresponding relation table, and the current humidity compensation coefficient corresponding to the current indoor relative humidity can be obtained by inquiring the database after the current indoor relative humidity is obtained.

In the form of correspondence between the indoor relative humidity and the humidity compensation coefficient, one indoor relative humidity may correspond to one humidity compensation coefficient, or a plurality of indoor relative humidities may correspond to one humidity compensation coefficient. Whichever form the indoor relative humidity and humidity compensation coefficient take, the following relationship is ensured: the greater the indoor relative humidity, the greater the humidity compensation coefficient.

Optionally, determining the current humidity compensation coefficient corresponding to the current indoor relative humidity according to the correspondence between the indoor relative humidity and the humidity compensation coefficient may include: determining a first humidity compensation coefficient corresponding to a first relative humidity interval as a current humidity compensation coefficient under the condition that the current indoor relative humidity is in the first relative humidity interval; determining a second humidity compensation coefficient corresponding to the second relative humidity interval as a current humidity compensation coefficient under the condition that the current indoor relative humidity is in the second relative humidity interval; 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 smaller than the lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is smaller than the second humidity compensation coefficient.

The first relative humidity interval and the second relative humidity interval may or may not be continuous.

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

The plurality of preset relative humidity intervals may be divided by a plurality of humidity thresholds, where the number of humidity thresholds may be two, three, four or more, and is not specifically limited herein; the plurality of humidity thresholds are all valued within a preset relative humidity range, wherein 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%.

By adopting the technical scheme, the current humidity compensation coefficient corresponding to the current indoor relative humidity can be obtained.

In some application scenarios, the correspondence between the preset relative humidity interval and the humidity compensation coefficient may be as shown in table 1.

TABLE 1 correspondence between relative humidity intervals and humidity compensation coefficients

Presetting a relative humidity interval	a% or less	a% to b%	b% to c%	c% to d%	d% or more
						Humidity compensation coefficient	D1	D2	D3	D4	D5

In table 1, the four humidity thresholds a%, b%, c% and d% are related as follows: a% < b% < c% < D), and the relationship of the five humidity compensation coefficients D1, D2, D3, D4, and D5 is: d1 is more than D2 is more than D3 is more than D4 is less than D5. After the current indoor relative humidity is obtained, comparing the magnitude relation between the current indoor relative humidity and four humidity thresholds, further determining a preset relative humidity interval in which the current relative humidity is located, and finally obtaining a current humidity compensation coefficient corresponding to the current relative humidity.

After the critical point is considered, the preset relative humidity interval may be sequentially: [0, a% ], (a%, b% ], (b%, c% ], (c%, d% ], and (d%, 100], or the preset relative humidity intervals may be [0, a%), [ a%, b%), [ b%, c% >, [ c%, d%), and [ d%,100] in that order.

Corresponding to the foregoing embodiment, in the case where the first relative humidity interval is a% or less, the second relative humidity interval may be a% to b%, b% to c%, c% to d%, or d% or more; in the case where the first relative humidity interval is a% to b%, the second relative humidity interval may be b% to c%, c% to d%, or more than d%; in the case where the first relative humidity interval is b% to c%, the second relative humidity interval may be c% to d% or more; in the case where the first relative humidity interval is c% to d%, the second relative humidity interval may be d% or more.

Further, in the case that the first relative humidity zone and the second relative humidity zone are two adjacent relative humidity zones, the humidity compensation coefficient difference value is positively correlated with the lower limit value of the first relative humidity zone, or the humidity compensation coefficient difference value is positively correlated with the upper limit value of the first relative humidity zone, or the humidity compensation coefficient difference value is positively correlated with the lower limit value of the second relative humidity zone, or the humidity compensation coefficient difference value is positively correlated with the upper limit value of the second relative humidity zone. The humidity compensation coefficient difference is the difference between the second humidity compensation coefficient and the first humidity compensation coefficient, and the spans of the preset relative humidity intervals are the same. The higher the indoor relative humidity is, the higher the probability of condensing the moisture in the air on the indoor evaporator is, the larger the refrigeration load brought by the evaporator is, and the more the target exhaust temperature is compensated at the moment, so that the target exhaust temperature can be improved under the condition that the cold load brought by the indoor relative humidity is large, the opening degree of an expansion valve is further reduced, the too low air suction overheat is avoided, and the air conditioner energy efficiency is improved.

The foregoing application scenario is still exemplified. In the case where the first relative humidity interval is a% or less and the second relative humidity interval is a% to b%, the humidity compensation coefficient difference is Δd1=d2-D1; in the case where the first relative humidity interval is a% to b% or less and the second relative humidity interval is b% to c%, the humidity compensation coefficient difference is Δd2=d3-D2; in the case where the first relative humidity interval is b% to c%, and the second relative humidity interval is c% to D%, the humidity compensation coefficient difference is Δd3=d4-D3; in the case where the first relative humidity interval is c% to D% and the second relative humidity interval is D% or more, the humidity compensation coefficient difference is Δd4=d5-D4; wherein DeltaD 1 < DeltaD2 < DeltaD3 < DeltaD4).

By adopting the technical scheme, the current relative humidity compensation coefficient can be obtained.

S204, the initial target exhaust temperature is increased according to the current humidity compensation coefficient, and the current target exhaust temperature is obtained.

In the step, the initial target exhaust temperature is increased based on the current humidity compensation coefficient, and then the opening of the expansion valve is reduced in the process of controlling the opening of the expansion valve according to the current target exhaust temperature, so that the phenomena of low air suction superheat degree and low air conditioner energy efficiency caused by overlarge opening of the expansion valve are reduced.

Optionally, increasing the initial target exhaust temperature according to the current humidity compensation coefficient to obtain the current target exhaust temperature includes: and 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 gas temperature may be determined as the current target exhaust gas temperature, so that a digitized, accurate current target exhaust gas temperature for controlling the opening degree of the expansion valve may be obtained.

Alternatively, determining the current target exhaust temperature based on the sum of the current humidity compensation coefficient and the initial target exhaust temperature may include: acquiring the relative humidity in a history room before a set time length; determining a quotient of the current humidity compensation coefficient and the set duration as an expected change rate under the condition that the relative humidity difference value between the current indoor relative humidity and the historical indoor relative humidity is larger than or equal to a preset relative humidity difference value; increasing the initial target exhaust temperature according to the expected change rate until the current humidity compensation coefficient and the initial target exhaust temperature are increased; the increased initial target exhaust temperature is determined as the current target exhaust temperature.

The set time period may be 5min, 7min, 10min, 15min or 20min.

The preset relative humidity difference reflects a variation range of a target discharge temperature of the compressor, and the preset relative humidity difference can be determined as follows: according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient, a preset relative humidity difference value corresponding to the preset compensation coefficient is obtained, wherein the preset compensation coefficient can be 1 ℃, 2 ℃, 3 ℃, 4 ℃ or 5 ℃.

Alternatively, the preset relative humidity difference may be determined by: determining a difference value between a current humidity compensation coefficient and a preset compensation coefficient as a first humidity compensation coefficient; and obtaining a first indoor relative humidity corresponding to the first compensation coefficient according to the difference value between the indoor relative humidity and the humidity compensation coefficient, and determining the difference value between the current indoor relative humidity and the first indoor relative humidity as a preset relative humidity difference value.

The quotient of the current humidity compensation coefficient and the set time period is determined as the expected change rate, and the quotient of the current humidity compensation coefficient divided by the set time period may be determined as the expected change rate.

The initial target exhaust temperature is increased according to the expected change rate until the current humidity compensation coefficient and the initial target exhaust temperature are increased; the determining of the increased initial target exhaust temperature as the current target exhaust temperature may specifically be:

T _s ＝T _i +△T×t

Wherein T is _s For the current target exhaust temperature, T _s Is the sum of the current humidity compensation coefficient and the initial target exhaust temperature, T _i For the initial target exhaust temperature, Δt is the expected rate of change, and T is the time period from when the expected rate of change is determined to the current time.

Further, after the current target exhaust temperature is determined in the above manner, the current indoor relative humidity and the historical indoor relative humidity before the set time period are still obtained in real time; and maintaining the current humidity compensation coefficient unchanged under the condition that the relative humidity difference between the current indoor relative humidity and the historical indoor relative humidity is smaller than the preset relative humidity difference and the current target exhaust temperature is smaller than the sum of the current humidity compensation coefficient and the initial target exhaust temperature.

Thus, under the condition that the indoor environment temperature is reduced too quickly, the indoor relative humidity is changed greatly within a set time period, and a certain time period is required for the evaporator to be influenced by the larger indoor relative humidity; compared with the scheme that the sum of the initial target exhaust temperature and the current humidity compensation coefficient is determined as the current target exhaust temperature, the current target exhaust temperature determined according to the technical scheme can be slowly increased, so that the current target exhaust temperature is relatively consistent with the increasing amount of the changing indoor relative humidity on the air conditioner cooling load, the expansion valve can be more accurately regulated, the adverse phenomenon that the opening of the expansion valve is overlarge or undersize is reduced, and the air conditioner energy efficiency is improved.

Further, the set time period is a time period between the indoor relative humidity change time and the refrigerating rate improvement time of the air conditioner, and the set time period can be obtained through experiments. Therefore, the effect of the current target exhaust temperature increasing speed and the changing indoor relative humidity on the air conditioner cooling rate is more adaptive, the bad phenomenon that the air suction overheat is too low or too high caused by too large or too small opening of the expansion valve is further reduced, and the air conditioner energy efficiency is improved.

By adopting the scheme, the current target exhaust temperature can be obtained.

S205, adjusting the opening degree of an expansion valve of the air conditioner according to the current target exhaust temperature.

Obtaining the current exhaust temperature of the air conditioner compressor, and increasing the opening of the expansion valve under the condition that the current exhaust temperature is higher than the target exhaust temperature; in the case where the current exhaust gas temperature is lower than the target exhaust gas temperature, the opening degree of the expansion valve is reduced.

Further, adjusting the opening of the expansion valve of the air conditioner according to the current target exhaust temperature may include: obtaining the current exhaust temperature of an air conditioner compressor; and adjusting the opening degree of the expansion valve by adopting a control algorithm with a deviation elimination function according to the difference value between the current exhaust temperature and the target exhaust temperature so as to enable the current exhaust temperature to reach the target exhaust temperature.

The control algorithm with the deviation eliminating function can be a proportional-integral-derivative (Proportion Integral Differential, PID) algorithm, and can also be a linear quadratic regulator (Linear Quadratic Regulator, LQR). In this way, the opening degree of the expansion valve can be adjusted more accurately.

In the technical scheme provided by the embodiment of the application, the current target exhaust temperature is improved based on the current humidity compensation coefficient corresponding to the indoor relative humidity, under the condition that the indoor relative humidity is larger, the water vapor in the indoor air generates condensation phenomenon on the surface of the evaporator to form condensate water, heat is released, the refrigeration load of the air conditioner is improved, the evaporator temperature and the evaporation pressure of the evaporator can be increased at the moment, the actual air suction temperature of the compressor is improved, and the actual exhaust temperature of the compressor is improved.

Fig. 3 is a schematic flow chart of a method for controlling the opening of an expansion valve of an air conditioner according to an embodiment of the present application. The method for controlling the opening degree of the expansion valve of the air conditioner may be performed by a controller of the air conditioner.

As shown in fig. 3, the method for controlling the opening degree of the expansion valve of the air conditioner includes:

s301, in a refrigerating mode, the current indoor relative humidity is obtained.

S302, judging whether the current indoor relative humidity is greater than a minimum humidity threshold value; if yes, executing S303; otherwise, S301 is executed.

Wherein the minimum humidity threshold may be 45%, 50%, 55%, 60% or 65%.

And S303, obtaining the current running frequency and the current outdoor environment temperature of the air conditioner compressor.

S304, determining an initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature.

S305, determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient.

And S306, increasing the initial target exhaust temperature according to the current humidity compensation coefficient to obtain the current target exhaust temperature.

S307, adjusting the opening degree of the expansion valve of the air conditioner according to the current target exhaust temperature.

Fig. 4 is a schematic flow chart of a method for controlling the opening of an expansion valve of an air conditioner according to an embodiment of the present application. The method for controlling the opening degree of the expansion valve of the air conditioner may be performed by a controller of the air conditioner.

As shown in fig. 4, the method for controlling the opening degree of the expansion valve of the air conditioner includes:

s401, in the cooling mode, a current operating frequency of the air conditioner compressor, a current outdoor environment temperature, and a current indoor relative humidity are obtained.

S402, determining an initial target exhaust temperature according to the current operating frequency and the current outdoor environment temperature.

S403, determining a current relative humidity interval in which the current indoor relative humidity is located in a plurality of preset relative humidity intervals.

S404, determining a humidity compensation coefficient corresponding to the current relative humidity interval as a current humidity compensation coefficient corresponding to the current indoor relative humidity.

And S405, increasing the initial target exhaust temperature according to the current humidity compensation coefficient to obtain the current target exhaust temperature.

S406, adjusting the opening degree of the expansion valve of the air conditioner according to the current target exhaust temperature.

Fig. 5 is a schematic diagram of an apparatus for controlling an opening degree of an expansion valve of an air conditioner according to an embodiment of the present application.

As shown in fig. 5, the apparatus for controlling the opening degree of the expansion valve of the air conditioner includes 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 obtain a current operating frequency of the air conditioner compressor, a current outdoor ambient temperature, and a current indoor relative humidity in the cooling mode; the first determination module 52 is configured to determine an initial target discharge temperature based on 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 the correspondence between the indoor relative humidity and the humidity compensation coefficient; the second obtaining module 54 is configured to increase the initial target exhaust temperature according to the current humidity compensation coefficient to obtain the current target exhaust temperature; the adjustment module 55 is configured to adjust the opening degree of the air-conditioning expansion valve according to the current target exhaust gas temperature.

Alternatively, the second determining module 53 includes a first determining unit configured to determine a first humidity compensation coefficient corresponding to a first relative humidity interval as the current humidity compensation coefficient in the case where the current indoor relative humidity is in the first relative humidity interval; the second determining unit is configured to determine a second humidity compensation coefficient corresponding to a second relative humidity interval as a current humidity compensation coefficient in a case where the current indoor relative humidity is in the second relative humidity interval; 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 smaller than the lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is smaller than the second humidity compensation coefficient.

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; the humidity compensation coefficient difference is the difference between the second humidity compensation coefficient and the first humidity compensation coefficient, and the spans of all preset relative humidity intervals are the same.

Alternatively, the first determining module 52 includes a first obtaining unit configured to obtain a product of the current operating frequency and the exhaust gas temperature coefficient, a third determining unit, and a fourth determining unit; the third determining unit is configured to determine a current temperature compensation coefficient corresponding to the current outdoor environment temperature according to the corresponding relation between the outdoor environment temperature and the temperature compensation coefficient; the fourth determination unit is configured to determine a sum of the product and the current temperature compensation coefficient as an initial target exhaust gas temperature.

Optionally the second obtaining module 54 is specifically configured to: and determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature.

Optionally, the second obtaining module 54 includes a second obtaining unit, a fifth determining unit, an increasing unit, and a sixth determining unit, where the second obtaining unit is configured to obtain the historical indoor relative humidity before the set period of time; the fifth determining unit is configured to determine a quotient of the current humidity compensation coefficient and the set time period as an 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 a preset relative humidity difference; the increasing unit is configured to increase the initial target exhaust gas temperature at an expected rate of change until it increases to a sum of the current humidity compensation coefficient and the initial target exhaust gas temperature; the sixth determination unit is configured to determine the increased initial target exhaust gas temperature as the current target exhaust gas temperature.

Optionally, the adjusting module 53 includes a third obtaining unit configured to obtain the current discharge temperature of the air conditioner compressor and a control unit; the control unit is configured to adjust the opening degree of the expansion valve to make the current exhaust temperature reach the target exhaust temperature by adopting a control algorithm with a deviation elimination function according to the difference between the current exhaust temperature and the target exhaust temperature.

In some embodiments, an apparatus for controlling an opening degree of an expansion valve of an air conditioner includes a processor and a memory storing program instructions, the processor being configured to execute the method for an opening degree of an expansion valve of an air conditioning system provided in the foregoing embodiments when executing the program instructions.

Fig. 6 is a schematic diagram of an apparatus for controlling an opening degree of an expansion valve of an air conditioner according to an embodiment of the present application. As shown in fig. 6, the apparatus for controlling the opening degree of the expansion valve of the air conditioner includes:

a processor (processor) 61 and a memory (memory) 62, and may also include a communication interface (Communication Interface) 63 and a bus 64. The processor 61, the communication interface 63, and the memory 62 may communicate with each other via the bus 64. The communication interface 63 may be used for information transfer. The processor 61 may call logic instructions in the memory 62 to perform the method for controlling the opening degree of the expansion valve of the air conditioner provided in the foregoing embodiment.

Further, the logic instructions in the memory 62 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 62 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 61 executes functional applications and data processing by running software programs, instructions and modules stored in the memory 62, i.e. implements the methods of the method embodiments described above.

Memory 62 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of the terminal device, etc. In addition, memory 62 may include high-speed random access memory, and may also include non-volatile memory.

The embodiment of the application provides an intelligent air conditioner, which comprises the device for controlling the opening degree of an expansion valve of the air conditioner.

The embodiment of the application provides a computer readable storage medium storing computer executable instructions configured to execute the method for controlling the opening degree of an expansion valve of an air conditioner provided in the foregoing embodiment.

The present embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the method for controlling the opening degree of an expansion valve of an air conditioner provided in the foregoing embodiments.

The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

The technical solutions of the embodiments of the present application may be embodied in the form of a software product, where the software product is stored in a storage medium, and includes one or more instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or a transitory storage medium.

The above description and the drawings illustrate embodiments of the present application sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled person may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present application. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements may be merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for controlling an opening degree of an expansion valve of an air conditioner, comprising:

in the refrigeration mode, obtaining a current operating frequency, a current outdoor ambient temperature and a current indoor relative humidity of an air conditioner compressor;

Determining an initial target discharge temperature according to the current operating frequency and the current outdoor ambient temperature;

determining a current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient;

the initial target exhaust temperature is increased according to the current humidity compensation coefficient, and the current target exhaust temperature is obtained;

and adjusting the opening degree of the expansion valve of the air conditioner according to the current target exhaust temperature.

2. The method of claim 1, wherein determining a current humidity compensation coefficient corresponding to the current indoor relative humidity based on a correspondence of indoor relative humidity to the humidity compensation coefficient comprises:

determining a first humidity compensation coefficient corresponding to a first relative humidity interval as the current humidity compensation coefficient when the current indoor relative humidity is in the first relative humidity interval;

determining a second humidity compensation coefficient corresponding to a second relative humidity interval as the current humidity compensation coefficient when the current indoor relative humidity is in the second relative humidity interval;

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 smaller than the lower limit value of the second relative humidity interval, and the first humidity compensation coefficient is smaller than the second humidity compensation coefficient.

3. The method according to claim 2, wherein in case the first relative humidity interval and the second relative humidity interval are two adjacent relative humidity intervals, the humidity compensation coefficient difference is positively correlated with the lower or upper limit value of the first relative humidity interval, or the lower or upper limit value of the second relative humidity interval; the humidity compensation coefficient difference value is the difference value between the second humidity compensation coefficient and the first humidity compensation coefficient, and the spans of all preset relative humidity intervals are the same.

4. A method according to any one of claims 1 to 3, wherein said determining an initial target discharge temperature from said current operating frequency and said current outdoor ambient temperature comprises:

obtaining the product of the current operating frequency and the exhaust temperature coefficient;

determining a current temperature compensation coefficient corresponding to the current outdoor environment temperature according to the corresponding relation 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 gas temperature.

5. A method according to any one of claims 1 to 3, wherein increasing the initial target exhaust temperature in accordance with the current humidity compensation coefficient, to obtain a current target exhaust temperature, comprises:

And determining the current target exhaust temperature according to the sum of the current humidity compensation coefficient and the initial target exhaust temperature.

6. The method of claim 5, wherein determining the current target exhaust temperature based on the sum of the current humidity compensation coefficient and the initial target exhaust temperature comprises:

acquiring the relative humidity in a history room before a set time length;

determining the quotient of the current humidity compensation coefficient and the set duration as an expected change rate under the condition that the relative humidity difference value between the current indoor relative humidity and the historical indoor relative humidity is larger than or equal to a preset relative humidity difference value;

increasing the initial target exhaust temperature at the desired rate of change;

and determining the increased initial target exhaust temperature as the current target exhaust temperature.

7. A method according to any one of claims 1 to 3, wherein said adjusting the opening degree of an air conditioner expansion valve according to the current target exhaust gas temperature includes:

obtaining the current exhaust temperature of an air conditioner compressor;

and adjusting the opening degree of the expansion valve by adopting a control algorithm with a deviation elimination function according to the difference value between the current exhaust temperature and the target exhaust temperature so as to enable the current exhaust temperature to reach the target exhaust temperature.

8. An apparatus for controlling an opening degree of an expansion valve of an air conditioning system, comprising:

a first obtaining module configured to obtain a current operating frequency of the air conditioner compressor, a current outdoor ambient temperature, and a current indoor relative humidity in a cooling mode;

a first determination module configured to determine an initial target discharge temperature based on the current operating frequency and the current outdoor ambient temperature;

the second determining module is configured to determine a current humidity compensation coefficient corresponding to the current indoor relative humidity according to the corresponding relation between the indoor relative humidity and the humidity compensation coefficient;

a second obtaining module configured to increase the initial target exhaust temperature according to the current humidity compensation coefficient to obtain a current target exhaust temperature;

and the adjusting module is configured to adjust the opening degree of the air conditioner expansion valve according to the current target exhaust temperature.

9. An apparatus for controlling an opening degree of an expansion valve of an air conditioner, comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling an opening degree of an expansion valve of an air conditioner according to any one of claims 1 to 7 when executing the program instructions.

10. An intelligent air conditioner, characterized by comprising the device for controlling the opening degree of an expansion valve of an air conditioner according to claim 8 or 9.