CN115076886A

CN115076886A - Method and device for controlling air conditioner, air conditioner and storage medium

Info

Publication number: CN115076886A
Application number: CN202210458465.6A
Authority: CN
Inventors: 孙小峰; 矫立涛; 冯景学; 王铎; 李江飞
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-09-20
Also published as: WO2023207165A1

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for controlling an air conditioner, wherein the air conditioner comprises a defrosting valve group, one end of the defrosting valve group is connected between an indoor heat exchanger and a compressor, and the other end of the defrosting valve group is connected between an outdoor heat exchanger and the compressor; the method comprises the following steps: detecting the current phase current of the compressor; under the condition that the current phase current meets a first preset condition, adjusting the rotating speed of the fan; and controlling the opening of the defrosting valve group. And under the condition that the current phase current is determined to meet the first preset condition, the liquid impact is more generated when the air suction of the compressor carries liquid. By adjusting the rotating speed of the fan, the evaporation pressure is increased, and the liquid carrying amount of the air suction is reduced. By controlling the opening of the defrosting valve group, the exhaust gas and the suction gas of part of the compressor are mixed. The suction temperature is increased to reduce the liquid carrying amount of suction, so that the liquid impact elimination speed is increased when the compressor generates liquid impact. The application also discloses a device for controlling the air conditioner, the air conditioner and a storage medium.

Description

Method and device for controlling air conditioner, air conditioner and storage medium

Technical Field

The present application relates to the field of intelligent home appliance technologies, and for example, to a method and an apparatus for controlling an air conditioner, and a storage medium.

Background

At present, a compressor in an air conditioner is most sensitive to a use environment and a working condition, and the service life of the compressor directly influences the service life of the air conditioner, and the compressor gradually becomes a key point of research of various air conditioner manufacturers. During operation of the compressor, the occurrence of slugging (i.e., excessive liquid entrained in the compressor suction) can reduce the useful life of the compressor.

In the related art, a control method for preventing a compressor of an air conditioner from liquid impact includes: judging whether the compressor has liquid impact or not according to the operation parameters of the compressor; if the judgment result is that the compressor has liquid impact, determining an adjusting value of the opening degree of the electronic expansion valve according to the current opening degree of the electronic expansion valve; adjusting the opening degree of the electronic expansion valve by the adjusting value; controlling the electronic expansion valve to maintain the adjusted opening degree for a period of time, and then judging whether the compressor has liquid impact again; if the compressor still has liquid impact, repeating the steps until the liquid impact of the compressor disappears.

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

the method can eliminate the liquid impact of the compressor by adjusting the opening of the electronic expansion valve. However, in this method, the liquid inflow into the compressor is reduced by reducing the flow rate of the refrigerant, and the liquid slugging problem is gradually eliminated, and the speed of eliminating the liquid slugging is slow.

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 nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a method and a device for controlling an air conditioner, the air conditioner and a storage medium, so that when liquid impact occurs to a compressor, the speed of eliminating the liquid impact is increased.

In some embodiments, the air conditioner includes a defrost valve block having one end connected between the indoor heat exchanger and the compressor and the other end connected between the outdoor heat exchanger and the compressor; the method comprises the following steps: detecting the current phase current of the compressor; under the condition that the current phase current meets a first preset condition, adjusting the rotating speed of the fan; and controlling the opening of the defrosting valve group.

Optionally, adjusting the rotational speed of the fan comprises: obtaining a current operation mode; and adjusting the rotating speed of the fan according to the operation mode.

Optionally, according to the operation mode, adjusting the rotation speed of the fan includes: detecting the current rotating speed of an indoor fan under the condition that the operation mode is a refrigeration mode; determining the sum of the current rotating speed and the corrected rotating speed as a target rotating speed; controlling the indoor fan to operate at a target rotating speed; and under the condition that the operation mode is the heating mode, controlling the outdoor fan to operate at the set rotating speed.

Optionally, determining that the current phase current satisfies a first preset condition includes: determining the absolute value of the current difference between the current phase current and the historical phase current; obtaining the current moment under the condition that the absolute value of the current difference is greater than or equal to the current threshold; determining the time difference between the current time and the historical time; and under the condition that the time difference is less than or equal to the first set time, determining that the current phase current meets a first preset condition.

Optionally, controlling the opening of the defrost valve block comprises: opening a defrosting valve group; and adjusting the opening of the defrosting valve group according to the absolute value of the current difference.

Optionally, adjusting the opening of the defrost valve group according to the absolute value of the current difference includes: determining a target opening degree of the defrosting valve group corresponding to the absolute value of the current difference according to the absolute value of the current difference; the opening of the defrost valve block is adjusted to a target opening.

Optionally, the defrost valve block comprises: a first defrost valve having one end connected between the first region of the outdoor heat exchanger and the compressor; a second defrost valve having one end connected between the second region of the outdoor heat exchanger and the compressor; the air conditioner also comprises a two-way valve group, one end of the two-way valve group is connected between the defrosting valve group and the outdoor heat exchanger, and the other end of the two-way valve group is connected with the compressor; the two-way valve group includes: one end of the first two-way valve is connected between the first defrosting valve and the first area of the outdoor heat exchanger; one end of the second two-way valve is connected between the second defrosting valve and the second area of the outdoor heat exchanger; after controlling the opening degree of the defrosting valve group, the method further comprises the following steps: detecting phase current of the compressor for multiple times under the condition that the operation reaches a second set time; closing the first defrosting valve under the condition that the phase current is determined to meet a second preset condition; the first two-way valve is closed.

In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to, upon execution of the program instructions, perform the above-described method for controlling an air conditioner.

In some embodiments, the air conditioner includes: one end of the defrosting valve group is connected between the indoor heat exchanger and the compressor, and the other end of the defrosting valve group is connected between the outdoor heat exchanger and the compressor; and, the above-mentioned apparatus for controlling an air conditioner.

In some embodiments, the storage medium stores program instructions that, when executed, perform the above-described method for controlling an air conditioner.

The method and the device for controlling the air conditioner, the air conditioner and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:

the current phase current of the compressor is detected. Under the condition that the current phase current is determined to meet the first preset condition, liquid impact is caused more in the suction of the compressor and liquid is carried, and the liquid sucked by the compressor needs to be reduced. The rotating speed of the fan is adjusted, the evaporation pressure is increased, and the suction superheat degree of the compressor is improved so as to reduce the suction liquid carrying amount. By controlling the opening of the defrosting valve group, part of the exhaust gas of the compressor is mixed with the suction gas of the compressor through the defrosting valve group. The high exhaust temperature of the compressor can increase the suction temperature so as to reduce the suction liquid carrying amount, thereby improving the speed of eliminating liquid impact when the compressor generates liquid impact.

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 in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of an air conditioner provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a method for controlling an air conditioner according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of another method for controlling an air conditioner according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of another method for controlling an air conditioner according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of another method for controlling an air conditioner according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another method for controlling an air conditioner according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of another method for controlling an air conditioner according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of an apparatus for controlling an air conditioner according to an embodiment of the present disclosure.

Reference numerals are as follows:

11: a compressor; 12: a four-way valve; 13: an indoor heat exchanger; 14: a throttling element; 15: an outdoor heat exchanger; 16: a first defrost valve; 17: a second defrost valve; 18: a first two-way valve; 19: a second two-way valve; 20: a first shut-off valve; 21: a second stop valve; 22: a first temperature sensor; 23: a second temperature sensor.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. 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 be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

The term "correspond" may refer to an association or binding relationship, and a corresponding to B refers to an association or binding relationship between a and B.

As shown in fig. 1, an embodiment of the present disclosure provides an air conditioner including a compressor 11, a four-way valve 12, an indoor heat exchanger 13, a throttling element 14, an outdoor heat exchanger 15, a defrost valve group, and a two-way valve group. The compressor 11, two adjacent valve ports of the four-way valve 12, the indoor heat exchanger 13, the throttling element 14, the outdoor heat exchanger 15, the two-way valve group and the other two valve ports of the four-way valve 12 are sequentially connected in series to form a refrigerant circulation loop (i.e. one end of the two-way valve group is connected with the compressor 11 through the two valve ports of the four-way valve 12). One end of the defrost valve block is connected between the indoor heat exchanger 13 and the compressor 11 (via the four-way valve 12), and the other end is connected between the outdoor heat exchanger 15 and the compressor 11 (via the four-way valve 12 and the two-way valve block) (i.e., the other end of the two-way valve block is connected between the defrost valve block and the outdoor heat exchanger 15). The outdoor heat exchanger 15 is divided into a first region (upper portion) and a second region (lower portion) (or the first region may be the lower portion and the second region may be the upper portion), and the throttling element 14 is connected to the first region and the second region of the outdoor heat exchanger 15 through a first branch and a second branch, respectively. The defrost valve block comprises a first defrost valve 16 and a second defrost valve 17. One end of the first defrost valve 16 is connected between the first region of the outdoor heat exchanger 15 and the compressor 11, and the other end is connected between the indoor heat exchanger 13 and the compressor 11. One end of the second defrost valve 17 is connected between the second region of the outdoor heat exchanger 15 and the compressor 11, and the other end is connected between the indoor heat exchanger 13 and the compressor 11. The two-way valve set includes a first two-way valve 18 and a second two-way valve 19. One end of the first two-way valve 18 is connected between the first defrost valve 16 and the first region of the outdoor heat exchanger 15, and the other end is connected to the compressor 11. One end of the second two-way valve 19 is connected between the second defrost valve 17 and the second region of the outdoor heat exchanger 15, and the other end is connected to the compressor 11. In normal operation of the air conditioner, the first and

second defrost valves

16 and 17 are in a closed state, and the first and second two-

way valves

18 and 19 are in a fully opened state.

Optionally, the air conditioner further includes a first cut-off valve 20, a second cut-off valve 21, a first temperature sensor 22, and a second temperature sensor 23. One end of the first cut-off valve 20 is connected to the four-way valve 12 and the defrost valve block, and the other end is connected to the indoor heat exchanger 13. The second cut-off valve 21 is connected between the indoor heat exchanger 13 and the throttling element 14. The first temperature sensor 22 is disposed in the first branch. The second temperature sensor 23 is disposed in the second branch.

As shown in fig. 2, an embodiment of the present disclosure provides a method for controlling an air conditioner, including:

s210, the air conditioner detects the current phase current of the compressor.

And S220, under the condition that the current phase current meets the first preset condition, the air conditioner adjusts the rotating speed of the fan.

And S230, controlling the opening of the defrosting valve group by the air conditioner.

By adopting the method for controlling the air conditioner provided by the embodiment of the disclosure, the current phase current of the compressor is detected. Under the condition that the current phase current is determined to meet the first preset condition, liquid impact is caused more in the suction of the compressor and liquid is carried, and the liquid sucked by the compressor needs to be reduced. The rotating speed of the fan is adjusted, the evaporation pressure is increased, and the suction superheat degree of the compressor is improved so as to reduce the suction liquid carrying amount. By controlling the opening of the defrosting valve group, part of the exhaust gas of the compressor is mixed with the suction gas of the compressor through the defrosting valve group. The high exhaust temperature of the compressor can increase the suction temperature so as to reduce the suction liquid carrying amount, thereby improving the speed of eliminating liquid impact when the compressor generates liquid impact.

The method for controlling the air conditioner provided by the embodiment of the disclosure is also applicable to the air conditioner with single cooling or single heating (i.e. the air conditioner without the four-way valve).

Referring to fig. 3, an embodiment of the present disclosure provides another method for controlling an air conditioner, including:

s210, the air conditioner detects the current phase current of the compressor.

S241, the air conditioner determines the absolute value of the current difference between the current phase current and the historical phase current.

And S242, under the condition that the absolute value of the current difference is larger than or equal to the current threshold, the air conditioner obtains the current moment.

S243, the air conditioner determines a time difference between the current time and the historical time.

S244, in case that the time difference is less than or equal to the first set time, the air conditioner determines that the current phase current satisfies the first preset condition, and performs step S220.

And S245, under the condition that the time difference is greater than the first set time, the air conditioner determines that the current phase current does not meet a first preset condition, and the control is finished.

And S220, adjusting the rotating speed of the fan by the air conditioner.

And S230, controlling the opening of the defrosting valve group by the air conditioner, and finishing the control.

By adopting the method for controlling the air conditioner, whether the compressor has liquid impact or not is judged according to the absolute value of the current difference between the current phase current and the historical phase current of the compressor. When liquid impact occurs, the running frequency of the compressor is unstable, and the phase current fluctuation range is large. And determining whether the liquid impact problem really occurs or not by judging whether the time difference between the moments of unstable operation of two times is within the first set time or not due to the fact that errors possibly exist in the detection. Alternatively, it may be considered that the liquid strike problem is determined to occur when the liquid strike phenomenon occurs a plurality of times within the first set time. Whether the liquid impact problem occurs to the compressor is judged accurately, so that the liquid impact eliminating speed is increased when the liquid impact occurs.

The historical phase current is the previously detected phase current of the compressor. The historical time is the time when the current instability occurs last time (namely, the time when the absolute value of the current difference is larger than or equal to the current threshold value during the previous operation). For example, the phase current of the compressor is detected once per second, and the present time is 30 th second. The absolute value of the current difference between the phase current measured at the 10 th second and the phase current measured at the 30 th second is greater than or equal to the current threshold (that is, the absolute value of the current difference between the phase current measured at the 30 th second and the phase current measured at the 29 th second is greater than or equal to the current threshold, and the absolute value of the current difference between the phase current measured at the 10 th second and the phase current measured at the 9 th second is greater than or equal to the current threshold). Then, the current time is 30 th second, the history time is 10 th second, and the time difference is 20 seconds.

Optionally, the value range of the current threshold is [0.18, 0.22] a. Preferably, the current threshold value is 0.19A, 0.2A or 0.21A. The value range of the first set time is [110, 130] s. Preferably, the first set time takes a value of 115s, 120s or 125 s. Thus, when the value of the current threshold is within the range, the fluctuation degree of the phase current can reflect whether the operation frequency of the compressor is stable (i.e. whether the fluctuation range of the operation frequency of the compressor exceeds the preset value). When the value of the first set time is in the range, misjudgment of the liquid impact problem caused by detection errors is reduced, and the stability of the operation of the compressor is matched with expectation.

Referring to fig. 4, an embodiment of the present disclosure provides another method for controlling an air conditioner, including:

and S210, detecting the current phase current of the compressor by the air conditioner.

And S221, under the condition that the current phase current meets the first preset condition, the air conditioner obtains the current running mode.

S222, the air conditioner adjusts the rotating speed of the fan according to the running mode.

By adopting the method for controlling the air conditioner provided by the embodiment of the disclosure, the liquid impact states are different in different operation modes. The rotating speed of the fan is adjusted according to the operation mode so as to change the evaporation pressure under different liquid impact states. The liquid carrying amount of the suction gas is reduced by changing the evaporation pressure, so that the liquid impact eliminating speed is increased when the compressor generates liquid impact.

Optionally, the step S222 of adjusting the rotation speed of the fan according to the operation mode by the air conditioner includes: and under the condition that the operation mode is the refrigeration mode, the air conditioner detects the current rotating speed of the indoor fan. The air conditioner determines the sum of the current rotation speed and the corrected rotation speed as a target rotation speed. The air conditioner controls the indoor fan to operate at a target rotation speed. And under the condition that the operation mode is the heating mode, the air conditioner controls the outdoor fan to operate at the set rotating speed. Thus, in the cooling mode, the compressor is less likely to suffer liquid slugging and is in a light state. The current rotating speed of the indoor fan is corrected to increase the evaporation pressure, so that the liquid impact problem can be solved. In the heating mode, the compressor is highly likely to suffer from liquid slugging and is in a severe state. The liquid impact problem can be solved only by adjusting the rotating speed of the outdoor fan to be the set rotating speed to increase the evaporation pressure. Under different working conditions, different rotating speed adjusting modes are adopted for different fans, and the speed of eliminating the liquid impact is increased.

Optionally, the value range of the correction rotation speed is [40, 60] rpm. Preferably, the correction speed is 45rpm, 50rpm or 55 rpm. The value range of the set rotating speed is [90, 100] percent of the rated rotating speed. Preferably, the set rotation speed is 93%, 95% or 97% of the rated rotation speed. Thus, since the state of occurrence of liquid slugging in the cooling mode is slight, liquid slugging can be eliminated by only increasing a small evaporation pressure. The rotating speed of the indoor fan is improved slightly, the evaporation pressure is improved slightly to eliminate liquid impact, and meanwhile, the influence on the running state of the air conditioner and the power consumption of the air conditioner can be reduced. Since the liquid impact occurs in a severe state in the heating mode, the liquid impact can be eliminated by increasing a large evaporation pressure. The rotating speed of the outdoor fan is adjusted to be close to the rated rotating speed, so that the evaporation pressure is greatly improved to eliminate liquid impact. Under different working conditions, different rotating speed adjusting modes are adopted for different fans, so that the influence on the running state of the air conditioner is reduced, and the liquid impact eliminating speed is increased.

Referring to fig. 5, an embodiment of the present disclosure provides another method for controlling an air conditioner, including:

s210, the air conditioner detects the current phase current of the compressor.

And S231, the air conditioner starts the defrosting valve group.

And S232, the air conditioner adjusts the opening of the defrosting valve group according to the absolute value of the current difference.

By adopting the method for controlling the air conditioner provided by the embodiment of the disclosure, the defrosting valve group is opened, part of exhaust air of the compressor is mixed with the suction air of the compressor through the defrosting valve group, and the suction air temperature can be increased due to the high exhaust air temperature of the compressor, so that the suction air liquid carrying capacity is reduced. And adjusting the opening of the defrosting valve group according to the absolute value of the current difference, and changing the mixing degree of the exhaust and the suction of the compressor. Because the opening of the defrosting valve group is based on the absolute value of the current difference, the adjustment of the mixing degree of the exhaust and the suction of the compressor is adaptive to the unstable degree of the operating frequency, and the liquid impact eliminating speed is improved.

And (5) opening the defrosting valve group for the air conditioner in the step (S231), and opening a first defrosting valve and a second defrosting valve for the air conditioner. And adjusting the opening degree of the defrosting valve group for the air conditioner in the step S232 according to the absolute value of the current difference, and adjusting the opening degrees of the first defrosting valve and the second defrosting valve to be the same opening degree for the air conditioner.

Optionally, the adjusting, by the air conditioner in step S232, the opening of the defrost valve group according to the absolute value of the current difference includes: and the air conditioner determines the target opening of the defrosting valve group corresponding to the absolute value of the current difference according to the absolute value of the current difference. The air conditioner adjusts the opening of the defrost valve group to a target opening. The larger the absolute value of the current difference is, the larger the target opening degree is. Thus, the larger the absolute value of the current difference, the more unstable the operating frequency of the compressor, and the higher the discharge and suction volumes of the compressor that need to be mixed. The speed of eliminating liquid slugging is increased by adjusting the mixing degree of exhaust and suction according to the unstable degree of the operating frequency.

For example, when the absolute value of the current difference is greater than or equal to 0.2A and less than 0.25A, the opening degrees of the first and second defrost valves are 15% of the total opening degree. When the absolute value of the current difference is greater than or equal to 0.25A and less than 0.3A, the opening degrees of the first and second defrost valves are 20% of the total opening degree. When the absolute value of the current difference is greater than or equal to 0.3A, the opening degrees of the first defrost valve and the second defrost valve are 25% of the total opening degree. The above values are only examples, and the actual values can be adjusted according to the performance and the operation condition of the air conditioner.

Optionally, the air conditioner in step S230 controls the opening of the defrost valve group, or the opening of the defrost valve group may be adjusted to a set value after the defrost valve group is opened by the air conditioner. For example, 20% of the total opening. Therefore, the problem that the liquid impact elimination speed is influenced due to the small opening of the defrosting valve group caused by the phase current detection error can be avoided.

Referring to fig. 6, an embodiment of the present disclosure provides another method for controlling an air conditioner, including:

s210, the air conditioner detects the current phase current of the compressor.

And S250, detecting the phase current of the compressor by the air conditioner for a plurality of times when the operation reaches the second set time.

And S260, under the condition that the phase current is determined to meet the second preset condition, the air conditioner closes the first defrosting valve.

And S270, the air conditioner closes the first two-way valve, and the control is finished.

And S261, under the condition that the phase current is determined not to meet the second preset condition, keeping the running state of the air conditioner unchanged, and ending the control.

By adopting the method for controlling the air conditioner provided by the embodiment of the disclosure, after the opening of the defrosting valve group is controlled to operate for the second set time, the phase current of the compressor is detected for a plurality of times so as to judge whether the operating frequency of the compressor is stable. In case the operation of the compressor is unstable, the first defrost valve and the first two-way valve are closed. At this time, the first region of the outdoor heat exchanger serves as a reservoir for temporarily storing the refrigerant, so that the refrigerant circulation amount in the refrigerant circulation system is reduced, thereby increasing the suction superheat degree to reduce the suction liquid amount. The speed of eliminating liquid slugging is increased when the liquid slugging occurs in the compressor by reducing the circulation amount of the refrigerant in the system.

The phase current of the compressor is detected for the air conditioner in the step S250 a plurality of times, and the current phase current of the compressor is detected for every sampling time. For example, the sampling time may be 1 s.

And if the phase current determined in the step S260 satisfies the second preset condition, determining an absolute value of the current difference by subtracting the absolute value of the current difference from the phase current detected before after the air conditioner detects the phase current of the compressor once. And when the absolute value of the current difference is greater than or equal to the current threshold value twice or more within the first set time, the air conditioner determines that the phase current meets a second preset condition.

For the determined phase current in step S261 not satisfying the second preset condition, the air conditioner determines that the phase current does not satisfy the second preset condition, in which the absolute values of the current differences are smaller than the current threshold for the first set time.

The value range of the second set time is [4, 6] min. Preferably, the second set time value is 4.5min, 5min or 5.5 min. Therefore, when the value of the second set time is in the range, the operation state of the adjusted compressor is stable, and misjudgment of liquid impact caused by sudden change of phase current in the adjustment process of the compressor is avoided.

Referring to fig. 7, an embodiment of the present disclosure provides another method for controlling an air conditioner, including:

s210, the air conditioner detects the current phase current of the compressor.

S270, the air conditioner closes the first two-way valve.

And S280, detecting the phase current of the compressor by the air conditioner for a plurality of times when the operation reaches the third set time.

And S290, the air conditioner adjusts the opening degree of the first two-way valve according to the phase current.

By adopting the method for controlling the air conditioner provided by the embodiment of the disclosure, the air conditioner runs for the third set time after the first defrosting valve and the first two-way valve are closed, the phase current of the compressor is detected for a plurality of times after the refrigerant flows stably, and whether the running frequency of the current compressor is stable or not is judged. And adjusting the opening degree of the first two-way valve according to the phase current, and changing the refrigerant quantity of the first area of the outdoor heat exchanger so as to adjust the refrigerant quantity in the refrigerant circulating system. The running performance of the air conditioner is improved by adjusting the refrigerant quantity in the refrigerant circulating system under the condition of avoiding liquid impact.

The phase current of the compressor is detected for the air conditioner in the step S280 a plurality of times, and the current phase current of the compressor is detected for every sampling time.

Optionally, the value range of the third setting time is [9, 11] min. Preferably, the third setting time is 9.5min, 10min or 10.5 min. Thus, when the value of the third set time is in the range, the refrigerant quantity in the refrigerant circulating system is stable, so that whether the liquid impact problem exists in the compressor or not can be judged.

Optionally, the air conditioner in step S290 adjusts the opening degree of the first two-way valve according to the phase current, including: during the second set time, the air conditioner determines the absolute value of the current difference between every two adjacent phase currents. And under the condition that the absolute value of the current difference is greater than or equal to the current threshold, the air conditioner closes the first two-way valve. And under the condition that the absolute values of the current differences are smaller than the current stable value, the air conditioner determines that the sum of the current opening and the set opening of the first two-way valve is the target opening. The air conditioner adjusts the opening degree of the first two-way valve to the target opening degree, and returns to step S280. And under the condition that the absolute value of the current difference is greater than or equal to the current stable value and smaller than the current threshold value, the air conditioner keeps the opening degree of the first two-way valve unchanged. Therefore, when the absolute value of the current difference is greater than or equal to the current threshold, the operating frequency of the compressor is unstable and liquid slugging occurs, and the refrigerant circulating amount in the refrigerant circulating system needs to be reduced by closing the first two-way valve, so that the suction superheat degree is improved to reduce the suction liquid carrying amount. Under the condition that the absolute value of the current difference is smaller than the current stable value, the operation frequency of the compressor is stable, the liquid impact problem does not exist, and the opening degree of the first two-way valve is gradually increased to increase the refrigerant quantity in the refrigerant circulating system. When the absolute value of the current difference is larger than or equal to the current stable value and smaller than the current threshold value, the operation of the compressor fluctuates but the liquid carrying amount of the sucked air is low, the opening degree of the first two-way valve is kept unchanged, and liquid slugging is avoided or the refrigerant amount in the refrigerant circulating system is reduced. The running performance of the air conditioner is improved by gradually increasing the refrigerant quantity of the refrigerant circulating system under the stable condition.

Optionally, the stable value of the current is in a range of [0.08, 0.12] a. Preferably, the current stabilization value is 0.09A, 0.1A or 0.11A. The value range of the set opening degree is [8, 12] percent of the total opening degree. Preferably, the set opening value is 9%, 10% or 11% of the total opening. Thus, when the value of the current stabilization value is in the above range, the fluctuation degree of the phase current is low, and the suction liquid carrying amount of the compressor is small, so that the operation frequency is stabilized. When the value of the set opening degree is in the range, the target opening degree of the first two-way valve is gradually increased, and the problems that liquid impact occurs due to the fact that the opening degree of the first two-way valve is too high and the speed of the refrigerant entering the refrigerant circulating system is low due to the fact that the opening degree of the first two-way valve is too small are avoided.

As shown in fig. 8, an embodiment of the present disclosure provides an apparatus for controlling an air conditioner, which includes a processor (processor)41 and a memory (memory) 42. Optionally, the apparatus may further include a Communication Interface (Communication Interface)43 and a bus 44. The processor 41, the communication interface 43, and the memory 42 may communicate with each other via a bus 44. The communication interface 43 may be used for information transfer. The processor 41 may call logic instructions in the memory 42 to perform the method for controlling the air conditioner of the above-described embodiment.

Furthermore, the logic instructions in the memory 42 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product.

The memory 42 is a storage medium and can be used for storing software programs, computer executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 41 executes functional applications and data processing, i.e., implements the method for controlling the air conditioner in the above-described embodiment, by executing program instructions/modules stored in the memory 42.

The memory 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 42 may include a high speed random access memory and may also include a non-volatile memory.

The embodiment of the disclosure provides an air conditioner, which comprises the device for controlling the air conditioner.

The disclosed embodiments provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling an air conditioner.

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

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify 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. Furthermore, the words used in the specification are words of description for example only and are not limiting upon the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would 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 may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart 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 disclosure. 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. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for controlling an air conditioner, the air conditioner including a defrost valve group, one end of the defrost valve group being connected between an indoor heat exchanger and a compressor, the other end being connected between an outdoor heat exchanger and the compressor; characterized in that the method comprises:

detecting the current phase current of the compressor;

under the condition that the current phase current meets a first preset condition, adjusting the rotating speed of the fan;

and controlling the opening of the defrosting valve group.

2. The method of claim 1, wherein adjusting the rotational speed of the fan comprises:

acquiring a current running mode;

and adjusting the rotating speed of the fan according to the operation mode.

3. The method of claim 2, wherein adjusting the rotational speed of the fan according to the operating mode comprises:

detecting the current rotating speed of an indoor fan under the condition that the operation mode is a refrigeration mode;

determining the sum of the current rotating speed and the corrected rotating speed as a target rotating speed;

controlling the indoor fan to operate at a target rotating speed;

and under the condition that the operation mode is the heating mode, controlling the outdoor fan to operate at the set rotating speed.

4. The method of claim 1, wherein determining that the current phase current satisfies a first preset condition comprises:

determining the absolute value of the current difference between the current phase current and the historical phase current;

obtaining the current moment under the condition that the absolute value of the current difference is greater than or equal to the current threshold;

determining the time difference between the current time and the historical time;

and under the condition that the time difference is less than or equal to the first set time, determining that the current phase current meets a first preset condition.

5. The method of claim 4, wherein controlling the opening of the defrost valve block comprises:

opening a defrosting valve group;

and adjusting the opening of the defrosting valve group according to the absolute value of the current difference.

6. The method of claim 5, wherein adjusting the opening of the defrost valve bank based on the absolute value of the current difference comprises:

determining a target opening degree of the defrosting valve group corresponding to the absolute value of the current difference according to the absolute value of the current difference;

the opening of the defrost valve block is adjusted to a target opening.

7. The method of any of claims 1 to 6, the defrost valve bank comprising: a first defrost valve having one end connected between the first region of the outdoor heat exchanger and the compressor; a second defrost valve having one end connected between the second region of the outdoor heat exchanger and the compressor; the air conditioner also comprises a two-way valve group, one end of the two-way valve group is connected between the defrosting valve group and the outdoor heat exchanger, and the other end of the two-way valve group is connected with the compressor; the two-way valve group includes: one end of the first two-way valve is connected between the first defrosting valve and the first area of the outdoor heat exchanger; one end of the second two-way valve is connected between the second defrosting valve and the second area of the outdoor heat exchanger; the defrosting control method is characterized by further comprising the following steps of after the opening of the defrosting valve group is controlled:

detecting phase current of the compressor for multiple times under the condition that the operation reaches a second set time;

closing the first defrosting valve under the condition that the phase current is determined to meet a second preset condition;

the first two-way valve is closed.

8. An apparatus for controlling an air conditioner comprising a processor and a memory storing program instructions, characterized in that the processor is configured to perform the method for controlling an air conditioner according to any one of claims 1 to 7 when executing the program instructions.

9. An air conditioner, comprising:

one end of the defrosting valve group is connected between the indoor heat exchanger and the compressor, and the other end of the defrosting valve group is connected between the outdoor heat exchanger and the compressor; and the combination of (a) and (b),

the apparatus for controlling an air conditioner as claimed in claim 8.

10. A storage medium storing program instructions, characterized in that the program instructions, when executed, perform a method for controlling an air conditioner according to any one of claims 1 to 7.