WO2023207165A1

WO2023207165A1 - Method and device for controlling air conditioner, air conditioner, and storage medium

Info

Publication number: WO2023207165A1
Application number: PCT/CN2022/141376
Authority: WO
Inventors: 孙小峰; 矫立涛; 冯景学; 王铎; 李江飞
Original assignee: 青岛海尔空调器有限总公司; 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2022-04-28
Filing date: 2022-12-23
Publication date: 2023-11-02
Also published as: CN115076886A

Abstract

The present invention relates to the technical field of intelligent home appliances. Disclosed is a method for controlling an air conditioner. An air conditioner comprises a defrosting valve block. Of the defrosting valve block, one end is connected between an indoor heat exchanger and a compressor, and the other end is connected between an outdoor heat exchanger and the compressor. The method comprises: testing a present phase current of the compressor; when it is determined that the present phase current meets a first preset condition, adjusting the rotating speed of a blower; and controlling the opening of the defrosting valve block. When it is determined that the present phase current meets the first preset condition, suction gas of the compressor carries much liquid, causing liquid hammering. By means of adjusting the rotating speed of the blower, evaporation pressure is increased, thus reducing the amount of liquid in the suction gas. By means of controlling the opening of the defrosting valve block, part of discharged gas of the compressor and the suction gas are mixed. Since the temperature of the suction gas is increased to reduce the amount of liquid in the suction gas, when liquid hammering occurs in a compressor, the speed of liquid hammering elimination can be increased. Further disclosed in the present application are a device for controlling an air conditioner, an air conditioner and a storage medium.

Description

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

This application is filed based on a Chinese patent application with application number 202210458465.6 and a filing date of April 28, 2022, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application as a reference.

Technical field

This application relates to the technical field of smart home appliances, for example, to a method and device for controlling an air conditioner, an air conditioner, and a storage medium.

Background technique

At present, the compressor in the air conditioner is the most sensitive to the use environment and working conditions, and its service life directly affects the service life of the air conditioner, which has gradually become the focus of research by various air conditioner manufacturers. During the operation of the compressor, the occurrence of liquid hammer (that is, the compressor suction contains too much liquid) will reduce the service life of the compressor.

In related technologies, a control method used to prevent compressor liquid slugging in an air conditioner includes: judging whether there is liquid slugging in the compressor through the operating parameters of the compressor; if the judgment result is that there is liquid slugging in the compressor, the electronic expansion valve The current opening of the electronic expansion valve determines the adjustment value of the opening of the electronic expansion valve; adjust the opening of the electronic expansion valve with the adjustment value; control the electronic expansion valve to maintain the adjusted opening for a period of time, and then re-judge whether there is liquid shock in the compressor; if If liquid slugging still exists in the compressor, repeat the above steps until the liquid slugging of the compressor disappears.

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

This method can eliminate liquid shock of the compressor by adjusting the opening of the electronic expansion valve. However, this method reduces the amount of liquid entering the compressor by reducing the flow of refrigerant and gradually eliminates the problem of liquid slugging, but the elimination of liquid slugging is slow.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a simplified summary is provided below. This summary is not intended to be a general review, nor is it intended to identify key/important elements or delineate the scope of the embodiments, but is intended to serve as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide a method and device for controlling an air conditioner, an air conditioner, and a storage medium, so as to increase the speed of liquid shock elimination when liquid shock occurs in the compressor.

In some embodiments, the air conditioner includes a defrost valve group, one end of the defrost valve group is connected between the indoor heat exchanger and the compressor, and the other end is connected between the outdoor heat exchanger and the compressor; The method includes: detecting the current phase current of the compressor; adjusting the speed of the fan when it is determined that the current phase current meets the first preset condition; and controlling the opening of the defrost valve group.

Optionally, adjusting the speed of the fan includes: obtaining the current operating mode; and adjusting the speed of the fan according to the operating mode.

Optionally, adjusting the speed of the fan according to the operating mode includes: detecting the current speed of the indoor fan when the operating mode is the cooling mode; determining the sum of the current speed and the corrected speed as the target speed; controlling the indoor fan to achieve the target speed. Speed operation; when the operation mode is heating mode, the outdoor fan is controlled to run at the set speed.

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

Optionally, controlling the opening of the defrost valve group includes: opening the defrost valve group; and adjusting the opening of the defrost 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 the target opening of the defrost valve group corresponding to the absolute value of the current difference according to the absolute value of the current difference; The opening is adjusted to the target opening.

Optionally, the defrost valve group includes: a first defrost valve with one end connected between the first area of the outdoor heat exchanger and the compressor; a second defrost valve with one end connected to the second area of the outdoor heat exchanger. and the compressor; the air conditioner also includes a two-way valve group, one end of the two-way valve group is connected between the defrost valve group and the outdoor heat exchanger, and the other end is connected to the compressor; the two-way valve group includes: a first The two-way valve has one end connected between the first defrost valve and the first area of the outdoor heat exchanger; the second two-way valve has one end connected between the second defrost valve and the second area of the outdoor heat exchanger; After controlling the opening of the defrost valve group, it also includes: when the operation reaches the second set time, detecting the phase current of the compressor multiple times; when it is determined that the phase current meets the second preset condition, closing The first defrost valve; close the first two-way valve.

In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the above method for controlling an air conditioner when running the program instructions.

In some embodiments, the air conditioner includes: a defrost valve group, one end connected between the indoor heat exchanger and the compressor, and the other end connected between the outdoor heat exchanger and the compressor; and, the above-mentioned control Air conditioner installation.

In some embodiments, the storage medium stores program instructions, and when the program instructions are run, the above-mentioned method for controlling the air conditioner is executed.

The method and device for controlling an air conditioner, the air conditioner, and the storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

Detect the current phase current of the compressor. When it is determined that the current phase current meets the first preset condition, liquid shock often occurs when the compressor suctions liquid, and the liquid suctioned by the compressor needs to be reduced. By adjusting the fan speed, the evaporation pressure is increased, and the suction superheat of the compressor is increased to reduce the amount of liquid in the suction. By controlling the opening of the defrost valve group, part of the exhaust gas from the compressor is mixed with the suction air of the compressor through the defrost valve group. Because the exhaust temperature of the compressor is high, the suction temperature can be increased to reduce the amount of liquid in the suction, thereby increasing the speed of eliminating liquid slugging when liquid slugging occurs in the compressor.

The above general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by corresponding drawings. These exemplary descriptions and drawings do not constitute limitations to the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings are not limited to scale and in which:

Figure 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the present disclosure;

Figure 2 is a schematic diagram of a method for controlling an air conditioner provided by an embodiment of the present disclosure;

Figure 3 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

Figure 4 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

Figure 5 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

Figure 6 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

Figure 7 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

Figure 8 is a schematic diagram of a device for controlling an air conditioner provided by an embodiment of the present disclosure.

Reference signs:

11: Compressor; 12: Four-way valve; 13: Indoor heat exchanger; 14: Throttle element; 15: Outdoor heat exchanger; 16: First defrost valve; 17: Second defrost valve; 18: No. One two-way valve; 19: second two-way valve; 20: first stop valve; 21: second stop valve; 22: first temperature sensor; 23: second temperature sensor.

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for convenience of explanation, multiple details are provided 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 simplified to simplify the drawings.

The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the purposes of the embodiments of the present disclosure described herein. Furthermore, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

Unless otherwise stated, the term "plurality" means two or more.

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 means: A or B.

The term "and/or" is an association relationship describing objects, indicating that three relationships can exist. For example, A and/or B means: A or B, or A and B.

The term "correspondence" can refer to an association relationship or a binding relationship. The correspondence between A and B refers to an association relationship or a 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, the 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 formed in series. The refrigerant circulation circuit (that is, one end of the two-way valve group is connected to the compressor 11 through the two valve ports of the four-way valve 12). One end of the defrost valve group is connected between the indoor heat exchanger 13 and the compressor 11 (through the four-way valve 12), and the other end is connected between the outdoor heat exchanger 15 and the compressor 11 (through the four-way valve 12 and the two-way valve group) (that is, the other end of the two-way valve group is connected between the defrost valve group and the outdoor heat exchanger 15). Among them, the outdoor heat exchanger 15 is divided into a first area (upper part) and a second area (lower part) (or the first area can be the lower part and the second area is the upper part), and the throttling element 14 passes through the first branch. and the second branch are connected to the first area and the second area of the outdoor heat exchanger 15 respectively. The defrost valve group includes a first defrost valve 16 and a second defrost valve 17 . One end of the first defrost valve 16 is connected between the first area 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 area 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 group 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 area 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 area of the outdoor heat exchanger 15 , and the other end is connected to the compressor 11 . When the air conditioner is operating normally, the first defrost valve 16 and the second defrost valve 17 are in a closed state, and the first two-way valve 18 and the second two-way valve 19 are in a fully open state.

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

S220: When it is determined that the current phase current meets the first preset condition, the air conditioner adjusts the rotation speed of the fan.

S230, the air conditioner controls the opening of the defrost valve group.

The current phase current of the compressor is detected using the method for controlling the air conditioner provided by the embodiment of the present disclosure. When it is determined that the current phase current satisfies the first preset condition, the compressor suction liquid will often cause liquid shock, and it is necessary to reduce the liquid suctioned by the compressor. By adjusting the fan speed, the evaporation pressure is increased, and the suction superheat of the compressor is increased to reduce the amount of liquid in the suction. By controlling the opening of the defrost valve group, part of the exhaust gas from the compressor is mixed with the suction air of the compressor through the defrost valve group. Because the exhaust temperature of the compressor is high, the suction temperature can be increased to reduce the amount of liquid in the suction, thereby increasing the speed of eliminating liquid slugging when liquid slugging occurs in the compressor.

For a cooling-only or heating-only air conditioner (that is, an air conditioner without a four-way valve), the method for controlling the air conditioner provided by the embodiment of the present disclosure is also applicable.

As shown in 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.

S242: When the absolute value of the current difference is greater than or equal to the current threshold, the air conditioner obtains the current time.

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

S244: When the time difference is less than or equal to the first set time, the air conditioner determines that the current phase current meets the first preset condition, and executes step S220.

S245, when the time difference is greater than the first set time, the air conditioner determines that the current phase current does not meet the first preset condition, and this control ends.

S220, the air conditioner adjusts the fan speed.

S230, the air conditioner controls the opening of the defrost valve group, and this control ends.

Using the method for controlling an air conditioner provided by embodiments of the present disclosure, whether liquid shock occurs in the compressor is determined based on the absolute value of the current difference between the current phase current of the compressor and the historical phase current. When liquid shock occurs, the operating frequency of the compressor is unstable, resulting in a large range of phase current fluctuations. Since there may be errors in the detection, it is determined whether the liquid slugging problem actually occurs by judging whether the time difference between the two moments of unstable operation is within the first set time. Alternatively, it can also be considered that when liquid slugging occurs multiple times within the first set time, it is determined that a liquid slugging problem occurs. By accurately determining whether a liquid slugging problem occurs in the compressor, the speed of liquid slugging elimination can be increased when liquid slugging occurs.

The historical phase current is the phase current of the compressor detected last time. The historical moment is the moment when current instability occurred last time (that is, during the previous operation, the moment when the absolute value of the current difference was greater than or equal to the current threshold). For example, the phase current of the compressor is detected once every second, and the current time is the 30th second. At the 10th second and the 30th second, the absolute value of the current difference 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 30th second and the phase current measured at the 29th second is greater than or equal to the current threshold, The absolute value of the current difference between the phase current measured at the 10th second and the phase current measured at the 9th second is greater than or equal to the current threshold). Then, the current time is the 30th second, the historical time is the 10th 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 value of the first set time is 115s, 120s or 125s. In this way, when the value of the current threshold is within the above range, the degree of fluctuation of the phase current can reflect whether the operating frequency of the compressor is stable (that is, whether the fluctuation range of the operating frequency of the compressor exceeds the preset value). When the value of the first set time is within the above range, misjudgments of liquid hammer problems caused by detection errors are reduced, and the stability of the compressor operation matches expectations.

As shown in FIG. 4 , 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.

S221: When it is determined that the current phase current meets the first preset condition, the air conditioner obtains the current operating mode.

S222, the air conditioner adjusts the fan speed according to the operating mode.

S230, the air conditioner controls the opening of the defrost valve group.

Using the method for controlling an air conditioner provided by embodiments of the present disclosure, the states of liquid slugging are different in different operating modes. By adjusting the fan speed according to the operating mode, the evaporation pressure can be changed under different liquid hammer states. By changing the evaporation pressure, the amount of liquid carried in the suction air is reduced, so that when liquid hammer occurs in the compressor, the speed of liquid hammer elimination is increased.

Optionally, the air conditioner in step S222 adjusts the rotation speed of the fan according to the operating mode, including: when the operating mode is the cooling mode, the air conditioner detects the current rotation speed of the indoor fan. The air conditioner determines the sum of the current rotation speed and the corrected rotation speed as the target rotation speed. The air conditioner controls the indoor fan to run at a target speed. When the operating mode is heating mode, the air conditioner controls the outdoor fan to operate at a set speed. In this way, in the cooling mode, the possibility of liquid shock in the compressor is small and slight. By correcting the current speed of the indoor fan to increase the evaporation pressure, the liquid slugging problem can be dealt with. In heating mode, the possibility of liquid slugging in the compressor is high and serious. The liquid slugging problem can be dealt with by adjusting the outdoor fan speed to the set speed to increase the evaporation pressure. By adopting different speed adjustment methods for different fans under different working conditions, the speed of liquid hammer elimination can be increased.

Optionally, the value range of the correction speed is [40, 60] rpm. Preferably, the corrected rotational speed is 45rpm, 50rpm or 55rpm. The value range of the set speed is [90, 100]% of the rated speed. Preferably, the set rotation speed is 93%, 95% or 97% of the rated rotation speed. In this way, since liquid slugging occurs slightly in cooling mode, only a small increase in evaporation pressure can eliminate liquid slugging. By slightly increasing the indoor fan speed and slightly increasing the evaporation pressure to eliminate liquid slugging, the impact on the operating status of the air conditioner and the power consumption of the air conditioner can be reduced. Since liquid slugging occurs seriously in heating mode, it is necessary to increase the evaporation pressure to eliminate liquid slugging. By adjusting the outdoor fan speed to close to the rated speed, the evaporation pressure is greatly increased to eliminate liquid slugging. By adopting different speed adjustment methods for different fans under different working conditions, the impact on the operating status of the air conditioner is reduced while increasing the speed of liquid slugging elimination.

As shown in 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.

S231, the air conditioner opens the defrost valve group.

S232, the air conditioner adjusts the opening of the defrost valve group based on the absolute value of the current difference.

Using the method for controlling the air conditioner provided by the embodiment of the present disclosure, by opening the defrost valve group, part of the exhaust gas from the compressor is mixed with the suction air of the compressor through the defrost valve group. Due to the exhaust temperature of the compressor High can increase the suction temperature and reduce the amount of liquid carried in the suction. According to the absolute value of the current difference, adjust the opening of the defrost valve group to change the mixing degree of the compressor's exhaust and suction air. Since the opening of the defrost valve group is based on the absolute value of the current difference, the mixing degree of the exhaust and suction air of the compressor is adjusted to adapt to the instability of the operating frequency to increase the speed of liquid shock elimination.

For the air conditioner in step S231, the defrost valve group is opened, and the first defrost valve and the second defrost valve are opened for the air conditioner. For the air conditioner in step S232, the opening of the defrost valve group is adjusted according to the absolute value of the current difference, and the opening of the first defrost valve and the second defrost valve are adjusted to the same opening for the air conditioner.

Optionally, the air conditioner in step S232 adjusts the opening of the defrost valve group according to the absolute value of the current difference, including: the air conditioner determines the target opening of the defrost valve group corresponding to the absolute value of the current difference according to the absolute value of the current difference. Spend. The air conditioner adjusts the opening of the defrost valve group to the target opening. Among them, the greater the absolute value of the current difference, the greater the target opening. In this way, the greater the absolute value of the current difference, the more unstable the operating frequency of the compressor, and the higher the exhaust and suction volumes of the compressor that require mixing. By adjusting the mixing degree of exhaust and suction according to the degree of instability of the operating frequency, the speed of liquid shock elimination is increased.

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

Optionally, the air conditioner controls the opening of the defrost valve group in step S230, or the air conditioner may open the defrost valve group and then adjust the opening of the defrost valve group to a set value. For example, it is 20% of the total opening. In this way, it can be avoided that the opening of the defrost valve group is small due to errors in phase current detection, which affects the speed of liquid shock elimination.

As shown in 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.

S230, the air conditioner controls the opening of the defrost valve group.

S250, when the operation reaches the second set time, the air conditioner detects the phase current of the compressor multiple times.

S260, when it is determined that the phase current meets the second preset condition, the air conditioner closes the first defrost valve.

S270, the air conditioner closes the first and two-way valves, and this control ends.

S261, when it is determined that the phase current does not meet the second preset condition, the air conditioner remains in the operating state, and this control ends.

Using the method for controlling an air conditioner provided by an embodiment of the present disclosure, after controlling the opening of the defrost valve group for a second set time, the phase current of the compressor is detected multiple times to determine whether the operating frequency of the compressor is stable. . When the operation of the compressor is unstable, the first defrost valve and the first two-way valve are closed. At this time, the first area of the outdoor heat exchanger serves as a liquid reservoir to temporarily store refrigerant, which reduces the amount of refrigerant circulating in the refrigerant circulation system, thereby increasing the suction superheat and reducing the amount of liquid carried in the suction. By reducing the amount of refrigerant circulating in the system, when liquid shock occurs in the compressor, the speed of liquid shock elimination is increased.

For the air conditioner in step S250, the phase current of the compressor is detected multiple times, and the current phase current of the compressor is detected once every sampling interval. For example, the sampling time can be 1s.

For determining that the phase current in step S260 satisfies the second preset condition, each time the air conditioner detects the phase current of the compressor, the absolute value of the current difference is determined by taking the absolute value of the difference from the previously detected phase current. When the absolute value of the current difference is greater than or equal to the current threshold twice or more within the first set time, the air conditioner determines that the phase current meets the second preset condition.

Regarding the determination in step S261 that the phase current does not meet the second preset condition, because within the first set time, the absolute values of the current differences are less than the current threshold, the air conditioner determines that the phase current does not meet the second preset condition.

The value range of the second set time is [4, 6]min. Preferably, the second set time is 4.5min, 5min or 5.5min. In this way, when the value of the second set time is within the above range, the operating state of the adjusted compressor is stable, avoiding misjudgments of liquid shock caused by sudden changes in the phase current of the compressor during the adjustment process.

As shown in 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.

S230, the air conditioner controls the opening of the defrost valve group.

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

S280, when the operation reaches the third set time, the air conditioner detects the phase current of the compressor multiple times.

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

Using the method for controlling an air conditioner provided by an embodiment of the present disclosure, the third set time is run after closing the first defrost valve and the first two-way valve, and the phase current of the compressor is detected multiple times after the refrigerant flow is stabilized. , determine whether the current operating frequency of the compressor is stable. According to the phase current, the opening of the first two-way valve is adjusted, and the amount of refrigerant in the first area of the outdoor heat exchanger is changed to adjust the amount of refrigerant in the refrigerant circulation system. By adjusting the amount of refrigerant in the refrigerant circulation system, the operating performance of the air conditioner can be improved while avoiding liquid slugging.

For the air conditioner in step S280, the phase current of the compressor is detected multiple times, and the current phase current of the compressor is detected once every sampling interval.

Optionally, the value range of the third set time is [9, 11] min. Preferably, the value of the third set time is 9.5min, 10min or 10.5min. In this way, when the value of the third set time is within the above range, the amount of refrigerant in the refrigerant circulation system is stable, so as to determine whether there is a liquid slugging problem in the compressor.

Optionally, the air conditioner in step S290 adjusts the opening of the first two-way valve according to the phase current, including: within the second set time, the air conditioner determines the absolute value of the current difference between each two adjacent phase currents. When 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. When the absolute values of the current differences are both less 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 of the first two-way valve to the target opening and returns to step S280. When the absolute value of the current difference is greater than or equal to the current stable value and less than the current threshold, the air conditioner keeps the opening of the first two-way valve unchanged. In this way, 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 shock occurs. It is necessary to close the first two-way valve to reduce the amount of refrigerant circulation in the refrigerant circulation system, thereby improving the suction air Superheat to reduce suction liquid volume. When the absolute value of the current difference is less than the current stability value, the operating frequency of the compressor is stable and there is no liquid slugging problem. The opening of the first two-way valve is gradually increased to increase the amount of refrigerant in the refrigerant circulation system. When the absolute value of the current difference is greater than or equal to the current stable value and less than the current threshold, the operation of the compressor fluctuates but the suction liquid volume is low. Keep the opening of the first two-way valve unchanged to avoid liquid hammer or drop. The amount of refrigerant in the refrigerant circulation system. By gradually increasing the amount of refrigerant in the refrigerant circulation system under stable conditions, the operating performance of the air conditioner is improved.

Optionally, the current stability value range is [0.08, 0.12]A. Preferably, the current stability value is 0.09A, 0.1A or 0.11A. The value range of the set opening is [8, 12]% of the total opening. Preferably, the opening value is set to 9%, 10% or 11% of the total opening. In this way, when the current stability value is within the above range, the fluctuation degree of the phase current is low, and the suction liquid volume of the compressor is small, making the operating frequency stable. When the opening value is set to be within the above range, the target opening of the first two-way valve gradually increases to avoid the occurrence of liquid shock caused by an excessively high opening of the first two-way valve and the refrigerant entering the refrigerant circulation caused by an excessively small opening. The system is slow.

As shown in FIG. 8 , an embodiment of the present disclosure provides a device for controlling an air conditioner, including a processor (processor) 41 and a memory (memory) 42. Optionally, the device may also include a communication interface (Communication Interface) 43 and a bus 44. Among them, the processor 41, the communication interface 43, and the memory 42 can communicate with each other through the bus 44. The communication interface 43 can be used for information transmission. The processor 41 may call logical instructions in the memory 42 to execute the method for controlling the air conditioner of the above embodiment.

In addition, the above-mentioned logical instructions in the memory 42 may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as an independent product.

As a storage medium, the memory 42 can be used to store 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 the program instructions/modules stored in the memory 42 to execute functional applications and data processing, that is, to implement the method for controlling the air conditioner in the above embodiment.

The memory 42 may include a program storage area and a data storage area, where the program storage area may store an operating system and 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, etc. In addition, the memory 42 may include high-speed random access memory, and may also include non-volatile memory.

An embodiment of the present disclosure provides an air conditioner, including the above device for controlling the air conditioner.

An embodiment of the present disclosure provides a computer program that, when executed by a computer, causes the computer to implement the above method for controlling an air conditioner.

Embodiments of the present disclosure provide a computer program product. The computer program product includes computer instructions stored on a computer-readable storage medium. When the program instructions are executed by a computer, the computer implements the above-mentioned control of air conditioners. device method.

An embodiment of the present disclosure provides a storage medium storing computer-executable instructions configured to execute the above method for controlling an air conditioner.

The above-mentioned storage medium may be a transient 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. The computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to perform all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage media can be non-transitory storage media, including: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc. A medium that can store program code or a temporary storage medium.

The foregoing description and drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless explicitly required, individual components and features are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Furthermore, the words used in this application are used only to describe the embodiments and not to limit 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 dictates 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 items. In addition, when used in this application, the term "comprise" and its variations "comprises" and/or "comprising" etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method or apparatus including the stated element. In this article, each embodiment may focus on its differences from other embodiments, and the same and similar parts among various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiment, then the relevant parts can be referred to the description of the method part.

Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods to implement the described functionality for each specific application, but such implementations should not be considered to be beyond the scope of the disclosed embodiments. The skilled person can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units may only be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined. Either it can be integrated into another system, or some features can be ignored, or not implemented. In addition, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into 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 disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more components for implementing the specified logical function(s). Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two consecutive blocks may actually execute substantially in parallel, or they may sometimes execute in the reverse order, depending on the functionality involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, operations or steps corresponding to different blocks may also occur in a sequence different from that disclosed in the description, and sometimes there is no specific distinction between different operations or steps. order. For example, two consecutive operations or steps may actually be performed substantially in parallel, or they may sometimes be performed in reverse order, depending on the functionality involved. Each block in the block diagram and/or flowchart illustration, and combinations of blocks in the block diagram and/or flowchart illustration, may be implemented by special purpose hardware-based systems that perform the specified functions or actions, or may be implemented using special purpose hardware implemented in combination with computer instructions.

Claims

A method for controlling an air conditioner. The air conditioner includes a defrost valve group, one end of the defrost valve group is connected between an indoor heat exchanger and a compressor, and the other end is connected between an outdoor heat exchanger and the compressor; It is characterized in that the method includes:

Detect the current phase current of the compressor;

When it is determined that the current phase current meets the first preset condition, adjust the speed of the fan;

Control the opening of the defrost valve group.
The method according to claim 1, characterized in that adjusting the speed of the fan includes:

Get the current operating mode;

Adjust the fan speed according to the operating mode.
The method according to claim 2, characterized in that adjusting the speed of the fan according to the operating mode includes:

When the operating mode is cooling mode, detect the current speed of the indoor fan;

Determine the sum of the current speed and the corrected speed as the target speed;

Control the indoor fan to run at the target speed;

When the operating mode is heating mode, the outdoor fan is controlled to run at the set speed.
The method according to any one of claims 1 to 3, characterized in that determining that the current phase current satisfies the first preset condition includes:

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

When the absolute value of the current difference is greater than or equal to the current threshold, the current moment is obtained;

Determine the time difference between the current moment and the historical moment;

When the time difference is less than or equal to the first set time, it is determined that the current phase current satisfies the first preset condition.
The method according to claim 4, characterized in that controlling the opening of the defrost valve group includes:

Open the defrost valve group;

According to the absolute value of the current difference, adjust the opening of the defrost valve group.
The method according to claim 5, characterized in that adjusting the opening of the defrost valve group according to the absolute value of the current difference includes:

According to the absolute value of the current difference, determine the target opening of the defrost valve group corresponding to the absolute value of the current difference;

Adjust the opening of the defrost valve group to the target opening.
According to the method according to any one of claims 1 to 6, the defrost valve group includes: a first defrost valve with one end connected between the first area of the outdoor heat exchanger and the compressor; a second defrost valve with one end It is connected between the second area of the outdoor heat exchanger and the compressor; the air conditioner also includes a two-way valve group, one end of the two-way valve group is connected between the defrost valve group and the outdoor heat exchanger, and the other end is connected to the compressor. Connection; the two-way valve group includes: a first two-way valve, one end connected between the first defrost valve and the first area of the outdoor heat exchanger; a second two-way valve, one end connected between the second defrost valve and the outdoor Between the second area of the heat exchanger; it is characterized in that, after controlling the opening of the defrost valve group, it also includes:

When the operation reaches the second set time, the phase current of the compressor is detected multiple times;

When it is determined that the phase current meets the second preset condition, close the first defrost valve;

Close the first two-way valve.
A device for controlling an air conditioner, including a processor and a memory storing program instructions, characterized in that the processor is configured to execute any one of claims 1 to 7 when running the program instructions. The method for controlling an air conditioner.
An air conditioner, characterized by including:

Defrost valve group, one end is connected between the indoor heat exchanger and the compressor, and the other end is connected between the outdoor heat exchanger and the compressor; and,

The device for controlling an air conditioner as claimed in claim 8.
A storage medium stores program instructions, characterized in that when the program instructions are run, the method for controlling an air conditioner according to any one of claims 1 to 7 is executed.
A computer program that, when executed by a computer, causes the computer to implement the method for controlling an air conditioner according to any one of claims 1 to 7.
A computer program product. The computer program product includes computer instructions stored on a computer-readable storage medium. When the program instructions are executed by a computer, the computer implements any one of claims 1 to 7. method for controlling an air conditioner.