CN118168121A

CN118168121A - Air conditioner control method, air conditioner and storage medium

Info

Publication number: CN118168121A
Application number: CN202211582981.6A
Authority: CN
Inventors: 黎辉玲; 汤奇雄; 李日新; 徐云松
Original assignee: GD Midea Air Conditioning Equipment Co Ltd; Guangzhou Hualing Refrigeration Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd; Guangzhou Hualing Refrigeration Equipment Co Ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2024-06-11

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium. The air conditioner comprises a refrigerant circulation loop, wherein the refrigerant circulation loop comprises a compressor, a reversing valve, a first heat exchanger, a throttling component, a second heat exchanger, an electronic expansion valve and a heat exchange part, the heat exchange part is arranged between the first heat exchanger and the throttling component, two ends of the throttling component and the heat exchange part after being connected in series are connected with two ends of the electronic expansion valve, and the heat exchange part is in heat exchange connection with a heating component. Controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening degree so as to enable the first heat exchanger to be in a condensation state and the second heat exchanger to be in an evaporation state; when the operation of the air conditioner meets the first defrosting condition, controlling the electronic expansion valve to operate at a second opening degree so as to increase the temperature of the second heat exchanger; wherein the second opening is larger than the first opening. The invention aims to avoid indoor temperature fluctuation, reduce the running noise of an air conditioner and improve the comfort of users.

Description

Air conditioner control method, air conditioner and storage medium

Technical Field

The present invention relates to the field of air conditioners, and in particular, to a control method of an air conditioner, and a storage medium.

Background

The air conditioner generally adjusts parameters of indoor environment through refrigerant circulation, wherein a part of flow paths are arranged in a plurality of refrigerant circulation loops and are in heat exchange connection with heating elements (such as electric control parts of an external machine) in the air conditioner, and medium-low temperature refrigerant flowing between the indoor machine and the outdoor machine flows into the part of flow paths to cool the heating elements during air conditioning refrigeration.

When defrosting is needed in heating operation, the direction of refrigerant flow is required to be switched through the direction change valve, so that the air conditioner is switched to refrigerating operation to defrost the frosted heat exchanger, however, the indoor environment temperature fluctuation is caused, noise is generated, and the user comfort is affected.

Disclosure of Invention

The invention mainly aims to provide a control method of an air conditioner, the air conditioner and a storage medium, and aims to avoid indoor temperature fluctuation, reduce operation noise of the air conditioner and improve user comfort.

In order to achieve the above object, the present invention provides a control method of an air conditioner, the air conditioner includes a refrigerant circulation loop, the refrigerant circulation loop includes a compressor, a reversing valve, a first heat exchanger, a throttling component, a second heat exchanger, an electronic expansion valve, and a heat exchange portion, the heat exchange portion is disposed between the first heat exchanger and the throttling component, two ends of the throttling component and the heat exchange portion after being connected in series are connected with two ends of the electronic expansion valve, the heat exchange portion is connected with a heating component by heat exchange, the control method of the air conditioner includes the following steps:

controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening degree so as to enable the first heat exchanger to be in a condensation state and the second heat exchanger to be in an evaporation state;

When the operation of the air conditioner meets the first defrosting condition, controlling the electronic expansion valve to operate at a second opening degree so as to increase the temperature of the second heat exchanger;

wherein the second opening is larger than the first opening.

Optionally, the first defrosting condition includes a first condition or a second condition, and the frosting risk of the second heat exchanger corresponding to the first condition is smaller than the frosting risk of the second heat exchanger corresponding to the second condition;

The second opening corresponding to the first condition is smaller than the second opening corresponding to the second condition.

Optionally, after the step of controlling the reversing valve to operate at the first valve position and controlling the electronic expansion valve to operate at the first opening degree, the method further includes:

When the operation of the air conditioner meets a second defrosting condition, controlling the reversing valve to operate at a second valve position and controlling the electronic expansion valve to operate at the first opening degree so as to enable the second heat exchanger to be in a condensation state;

the frosting degree of the second heat exchanger represented by the first frosting condition is smaller than that of the second heat exchanger represented by the second frosting condition.

when the first environmental temperature of the environment where the air conditioner is located is smaller than a preset environmental temperature, identifying whether the operation of the air conditioner meets the second defrosting condition or not;

when the first ambient temperature is greater than or equal to the preset ambient temperature and when the operation of the air conditioner does not meet a first preset condition, identifying whether the operation of the air conditioner meets one of the first defrosting condition and the second defrosting condition;

When the first ambient temperature is greater than or equal to the preset ambient temperature and the air conditioner meets the first preset condition, controlling the reversing valve to operate at a second valve position and controlling the electronic expansion valve to operate at the first opening degree so as to enable the second heat exchanger to be in a condensation state;

The first preset condition characterizes that the second heat exchanger frosts before the air conditioner is started.

Optionally, after the step of controlling the electronic expansion valve to operate at the second opening degree when the operation of the air conditioner meets the first defrosting condition, or after the step of controlling the reversing valve to operate at the second valve position and controlling the electronic expansion valve to operate at the first opening degree when the operation of the air conditioner meets the second defrosting condition, the method further comprises:

And when the operation of the electronic expansion valve reaches the defrosting end condition, returning to the step of controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening.

Optionally, the first defrosting condition includes a first condition or a second condition, the frost formation risk of the second heat exchanger corresponding to the first condition is smaller than the frost formation risk of the second heat exchanger corresponding to the second condition, and the step of identifying whether the air conditioner operation satisfies one of the first defrosting condition and the second defrosting condition includes:

when the defrosting condition which is met by the air conditioner last time is the first condition, identifying whether the operation of the air conditioner meets the second condition or not;

when the defrosting condition which is met by the air conditioner last time is the second condition, the second preset condition is not met, and the operation time of the air conditioner is smaller than a third preset time, whether the air conditioner meets the first condition is identified;

when the defrosting condition which is met by the air conditioner last time is the second condition and meets the second preset condition, or when the defrosting condition which is met by the air conditioner last time is the second condition and does not meet the second preset condition and the operation duration of the air conditioner is longer than the third preset duration, identifying whether the air conditioner meets the second defrosting condition;

The second preset condition comprises that the time length of defrosting of the air conditioner, which is last time the air conditioner meets the second condition, is longer than or equal to a first preset time length, and the temperature of the second heat exchanger is smaller than a first preset temperature, wherein the first preset time length is smaller than the third preset time length.

Optionally, the first preset condition includes:

The temperature difference value between the second ambient temperature of the environment where the second heat exchanger is located and the temperature of the second heat exchanger is larger than a target temperature difference threshold value;

the temperature of the second heat exchanger is smaller than the first preset temperature; and

The operation time length of the air conditioner is longer than a second preset time length.

Optionally, the target temperature difference threshold is determined according to the second ambient temperature.

Optionally, the first defrosting condition includes a first condition or a second condition, a frost formation risk of the second heat exchanger corresponding to the first condition is smaller than a frost formation risk of the second heat exchanger corresponding to the second condition, and when the operation of the air conditioner satisfies the first defrosting condition, the step of controlling the electronic expansion valve to operate at the second opening degree includes:

When the operation of the air conditioner meets the first condition, controlling a fan corresponding to the first heat exchanger to operate at a reduced rotating speed, and/or controlling the compressor to operate at a first frequency;

When the operation of the air conditioner meets the second condition, controlling a fan corresponding to the first heat exchanger to be closed, and/or controlling the compressor to be reduced to a second frequency operation;

wherein the first frequency is less than the second frequency.

Optionally, when the operation of the air conditioner meets the second condition, the step of controlling the fan corresponding to the first heat exchanger to be turned off includes:

when the operation of the air conditioner meets the second condition, controlling a fan corresponding to the first heat exchanger to be turned off at intervals of a third preset duration;

And/or after the step of controlling the fan corresponding to the first heat exchanger to be turned off when the operation of the air conditioner meets the second condition, the method further comprises:

When the operation of the air conditioner meets the defrosting end condition, controlling a fan corresponding to the first heat exchanger to be started, and controlling the electronic expansion valve to be switched to the first opening operation at intervals of a fourth preset duration.

In addition, in order to achieve the above object, the present application also proposes an air conditioner including:

The refrigerant circulation loop comprises a compressor, a reversing valve, a first heat exchanger, a throttling component, a second heat exchanger, an electronic expansion valve and a heat exchange part, wherein the heat exchange part is arranged between the first heat exchanger and the throttling component, two ends of the throttling component and the heat exchange part which are connected in series are connected with two ends of the electronic expansion valve, and the heat exchange part is in heat exchange connection with a heating component;

A control device, the control device comprising: the control method comprises the steps of a memory, a processor and a control program of an air conditioner, wherein the control program of the air conditioner is stored in the memory and can run on the processor, and the control program of the air conditioner is executed by the processor to realize the control method of the air conditioner.

Optionally, the air conditioner further includes:

The first one-way valve is arranged between the first heat exchanger and the heat exchange part and is in one-way conduction from the first heat exchanger to the heat exchange part;

The pipeline between the heat exchange part and the first one-way valve is connected with the first end of the electronic expansion valve, the second end of the electronic expansion valve is connected with the first end of the second one-way valve, the pipeline between the throttling component and the second heat exchanger is connected with the second end of the second one-way valve, and the second one-way valve is arranged to be in one-way conduction from the first end of the second one-way valve to the second end of the second one-way valve;

The pipeline between the second check valve and the electronic expansion valve is communicated with the first end of the third check valve, the pipeline between the first heat exchanger and the first check valve is communicated with the second end of the third check valve, and the third check valve is arranged to be conducted unidirectionally from the first end of the third check valve to the second end of the third check valve.

In addition, in order to achieve the above object, the present application also proposes a storage medium having stored thereon a control program of an air conditioner, which when executed by a processor, implements the steps of the control method of an air conditioner as set forth in any one of the above.

According to the air conditioner provided by the invention, the heat exchange part connected with the heating part is arranged between the first heat exchanger and the throttling part in the refrigerant circulation loop in a replacement way, the two ends of the throttling part connected with the heat exchange part in series are connected with the two ends of the electronic expansion valve, in the running process of the air conditioner by the first valve position, the electronic expansion valve and the throttling part are matched for throttling to enable the first heat exchanger to be in a condensation state and the second heat exchanger to be in an evaporation state, the first heat exchanger is arranged indoors and can raise the temperature of the indoor environment, when the running of the air conditioner meets the first defrosting condition, the reversing valve is not required to change the opening degree, the flow rate of the refrigerant flowing into the second heat exchanger is reduced by the electronic expansion valve, the flow rate of medium and high-temperature refrigerant flowing into the second heat exchanger is increased, so that the temperature of the second heat exchanger is increased, the frosting of the second heat exchanger is reduced, the frosting of the second heat exchanger is delayed, the air conditioner is not required to be switched by the reversing valve to switch the heat exchanger to be in the indoor environment, the indoor environment is effectively prevented from being polluted, the indoor environment is effectively, the reversing valve is not required to be changed, and the indoor environment is effectively polluted, and the indoor environment of the air conditioner is effectively can be changed, and the user can be in the reversing environment is prevented from being fluctuated. The electronic expansion valve and the throttling component are matched, so that the temperature of the refrigerant in the heat exchange part is not too low, and condensation of the heat exchange part in the heat dissipation process of the heating component is avoided.

Drawings

FIG. 1 is a schematic diagram of a system architecture of an embodiment of an air conditioner according to the present invention;

FIG. 2 is a schematic diagram of a hardware configuration involved in the operation of an embodiment of the air conditioner of the present invention;

FIG. 3 is a flow chart illustrating an embodiment of a control method of an air conditioner according to the present invention;

FIG. 4 is a flow chart of another embodiment of a control method of an air conditioner according to the present invention;

FIG. 5 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;

FIG. 6 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;

fig. 7 is a timing chart illustrating operation of each component in the air conditioner in the first defrosting mode and the second defrosting mode according to the embodiment of the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The embodiment of the invention provides an air conditioner. The air conditioner may be a split type air conditioner (e.g., a cabinet type air conditioner, a wall type air conditioner, etc.) or an integrated type air conditioner (e.g., a window type air conditioner, a mobile air conditioner, etc.).

In the embodiment of the invention, referring to fig. 1 to 2, the air conditioner comprises a refrigerant circulation loop and a control device 1, wherein the refrigerant circulation loop comprises a compressor 2, a reversing valve 3, a first heat exchanger 4, a throttling component 6, a second heat exchanger 7, an electronic expansion valve 8 and a heat exchange part 5, the heat exchange part 5 is arranged between the first heat exchanger 4 and the throttling component 6, two ends of the throttling component 6 connected in series with the heat exchange part 5 are connected with two ends of the electronic expansion valve 8, and the heat exchange part 5 is connected with a heating component in a heat exchange way. The reversing valve 3 and the electronic expansion valve 8 are connected with the control device 1.

In the present embodiment, the first heat exchanger 4 is provided indoors, and the second heat exchanger 7 is provided outdoors.

In the present embodiment, the throttle member 6 is a throttle pipe (spool) having a one-way throttle function.

In this embodiment, the heat generating component is disposed in the environment where the second heat exchanger 7 is located, for example, an electrical control in the outdoor unit. In other implementations, the heat generating component may be a component that generates heat during other operations that are provided in the air conditioner.

Specifically, the return air port of the compressor 2, the exhaust port of the compressor 2, the first end of the first heat exchanger 4 and the first end of the second heat exchanger 7 are all communicated with the reversing valve 3, and the second end of the first heat exchanger 4, the heat exchange portion 5, the throttling component 6 and the second end of the second heat exchanger 7 are sequentially communicated.

In this embodiment, the reversing valve 3 is a four-way valve. The four-way valve has a first valve position and a second valve position.

The discharge port of the compressor 2 is in communication with a first end of the first heat exchanger 4 and the return port of the compressor 2 is in communication with a second end of the second heat exchanger 7 in the first valve position. At this time, the refrigerant flowing out of the compressor 2 flows into the first heat exchanger 4, a part of the refrigerant flowing out of the first heat exchanger 4 flows through the heat exchange portion 5 and the throttling component 6 in sequence, and another part of the refrigerant flowing out of the first heat exchanger 4 flows into the second heat exchanger 7 and the return port of the compressor 2 after flowing through the electronic expansion valve 8 and converging with the refrigerant flowing out of the throttling component 6.

The second valve is in communication with the discharge port of the compressor 2 at the first end of the second heat exchanger 7 and the return port of the compressor 2 is in communication with the first end of the first heat exchanger 4. At this time, the refrigerant flowing out of the compressor 2 flows into the second heat exchanger 7, a part of the refrigerant flowing out of the second heat exchanger 7 flows through the throttling component 6 and the heat exchange portion 5 in sequence, and another part of the refrigerant flowing out of the second heat exchanger 7 flows into the first heat exchanger 4 and the return air port of the compressor 2 after flowing through the electronic expansion valve 8 and converging with the refrigerant flowing out of the heat exchange portion 5.

The throttle effect of the electronic expansion valve 8 is inversely related to the opening of the electronic expansion valve 8, and the temperature of the refrigerant flowing out of the electronic expansion valve 8 is positively related to the opening of the electronic expansion valve 8.

Further, in an embodiment, as shown in fig. 1, the air conditioner further includes:

a first check valve 91, wherein the first check valve 91 is arranged between the first heat exchanger 4 and the heat exchange part 5, and the first check valve 91 is arranged to be in one-way conduction from the first heat exchanger 4 to the heat exchange part 5;

a second check valve 92, wherein a pipeline between the heat exchange part 5 and the first check valve 91 is connected with a first end of the electronic expansion valve 8, a second end of the electronic expansion valve 8 is connected with a first end of the second check valve 92, a pipeline between the throttling part 6 and the second heat exchanger 7 is connected with a second end of the second check valve 92, and the second check valve 92 is arranged to be in one-way conduction from the first end of the second check valve 92 to the second end of the second check valve 92;

And a third one-way valve 93, wherein a pipeline between the second one-way valve 92 and the electronic expansion valve 8 is communicated with a first end of the third one-way valve 93, a pipeline between the first heat exchanger 4 and the first one-way valve 91 is communicated with a second end of the third one-way valve 93, and the third one-way valve 93 is arranged to be in one-way conduction from the first end of the third one-way valve 93 to the second end of the third one-way valve 93.

When the air conditioner is in a heating mode, the reversing valve 3 operates at a first valve position, the electronic expansion valve 8 operates at a first opening, as shown in fig. 1 (a), refrigerant flowing out of the compressor 2 flows into the first heat exchanger 4, a part of refrigerant flowing out of the first heat exchanger 4 sequentially flows through the first one-way valve 91, the heat exchange part 5 and the throttling part 6, and another part of refrigerant flowing out of the first heat exchanger 4 flows through the first one-way valve 91, the electronic expansion valve 8 and the second one-way valve 92, and then flows into the second heat exchanger 7 and a return port of the compressor 2 after being converged with refrigerant flowing out of the throttling part 6, wherein the refrigerant flowing out of the first heat exchanger 4 cannot flow through a branch where the third one-way valve 93 is located under the unidirectional cut-off effect of the third one-way valve 93. The high-pressure high-temperature refrigerant discharged by the compressor 2 flows into the first heat exchanger 4, the first heat exchanger 4 is in a condensation state, the electronic expansion valve 8 runs at a smaller first opening degree to throttle and reduce the pressure of the refrigerant flowing through the electronic expansion valve, the low-temperature low-pressure refrigerant can flow into the second heat exchanger 7 and then flows back to the compressor 2, and the second heat exchanger 7 is in an evaporation state.

When the air conditioner is in the first defrosting mode, the reversing valve 3 operates at a first valve position, the electronic expansion valve 8 operates at a second opening, as shown in fig. 1 (b), the refrigerant flowing out of the compressor 2 flows into the first heat exchanger 4, a small part of the refrigerant flowing out of the first heat exchanger 4 sequentially flows through the first one-way valve 91, the heat exchange part 5 and the throttling part 6, and a large part of the refrigerant flowing out of the first heat exchanger 4 flows into the second heat exchanger 7 and the air return port of the compressor 2 after flowing out of the first one-way valve 91, the electronic expansion valve 8 and the second one-way valve 92 and the refrigerant flowing out of the throttling part 6 are converged. The high-pressure high-temperature refrigerant discharged by the compressor 2 flows into the first heat exchanger 4, the first heat exchanger 4 is in a condensation state, indoor environment heating is maintained, the electronic expansion valve 8 operates at a larger second opening degree to throttle and reduce pressure of the refrigerant flowing through the electronic expansion valve 8, the temperature of the refrigerant flowing out of the electronic expansion valve 8 into the second heat exchanger 7 is higher than that of the refrigerant flowing out of the refrigerant flowing into the second heat exchanger 7 in a heating mode, the frost risk of the refrigerant flowing into the second heat exchanger 7 with relatively high temperature can be reduced (frost is avoided or the frost formed on the surface of the second heat exchanger 7 is melted), and the refrigerant flowing out of the second heat exchanger 7 can flow back to the compressor 2. Wherein the second heat exchanger 7 may be in a heat release state when the second opening is the maximum opening. When the second opening is smaller than the maximum opening, the second heat exchanger 7 may be in a weak evaporation state, but the temperature of the second heat exchanger 7 in the first defrosting mode is higher than the temperature of the second heat exchanger 7 in the heating mode. Specifically, the temperature of the second heat exchanger 7 in the first defrosting mode is higher than the freezing point temperature.

When the air conditioner is in the second defrosting mode, the reversing valve 3 operates in a second valve position, the electronic expansion valve 8 operates in a first opening, as shown in fig. 1 (c), the refrigerant flowing out of the compressor 2 flows into the second heat exchanger 7, the refrigerant flowing out of the second heat exchanger 7 is forbidden to flow into a branch of the second one-way valve 92 under the unidirectional cut-off action of the second one-way valve 92, all the refrigerant flowing out of the second heat exchanger 7 flows through the throttling part 6 to enter the heat exchange part 5, wherein the throttling part 6 does not have a throttling action on the refrigerant flowing in the direction, the refrigerant flowing out of the heat exchange part 5 is forbidden to flow into the branch of the first one-way valve 91 under the unidirectional cut-off action of the first one-way valve 91, and all the refrigerant flowing out of the electronic expansion valve 8 flows into the third one-way valve 93 to flow into the first heat exchanger 4 for evaporation after throttling and depressurization, and the refrigerant flowing out of the first heat exchanger 4 flows back into the compressor 2. The first heat exchanger 4 absorbs heat in an evaporation state, the second heat exchanger 7 releases heat in a condensation state, and the high-temperature refrigerant in the second heat exchanger 7 releases heat to melt frost on the surface of the second heat exchanger 7.

The arrangement of the second one-way valve 92 can ensure that when the reversing valve 3 runs in the second valve position, the refrigerant flowing out of the second heat exchanger 7 is prevented from directly flowing into the branch where the second one-way valve 92 is located, the refrigerant can flow through the heat exchange part 5 to exchange heat completely, and the refrigerant which is not throttled does not flow into the first heat exchanger 4, on the basis, the first one-way valve 91 and the third one-way valve 93 are mutually matched, the refrigerant flowing out of the heat exchange part 5 can flow into the first heat exchanger 4 after being throttled by the electronic expansion valve 8 completely, so that the evaporation effect of the first heat exchanger 4 is improved, the integral output capacity and the energy efficiency of a system are improved, the defrosting efficiency of the second heat exchanger 7 is effectively improved, and the heat dissipation effect of the heat exchange part 5 on heating parts is also effectively ensured.

The throttling effect of the throttling component 6 is smaller than that of the electronic expansion valve 8, so that condensation phenomenon in the heat dissipation process of the heat exchange part 5 can be avoided.

In other embodiments, the first check valve 91, the second check valve 92 and the third check valve 93 may be replaced by electromagnetic valves, and the flow guiding between the first heat exchanger 4 and the second heat exchanger 7 is matched with the actual operation mode through switching the opening and closing of the electromagnetic valves.

Further, in an embodiment, referring to fig. 2, the air conditioner further includes a temperature detection module 01, where the temperature detection module 01 may include temperature sensors disposed at a plurality of different positions, for example, an environment of the second heat exchanger 7, an environment of the first heat exchanger 4, a coil of the second heat exchanger 7, a coil of the first heat exchanger 4, and so on. The temperature detection module 01 is connected with the control device 1, and the control device 1 can acquire data detected by the temperature detection module 01.

In an embodiment of the present invention, referring to fig. 2, a control device 1 of an air conditioner includes: a processor 1001 (e.g., CPU), a memory 1002, a timer 1003, and the like. The components in the control device 1 are connected by a communication bus. The memory 1002 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 may alternatively be a storage device separate from the processor 1001 described above.

It will be appreciated by those skilled in the art that the device structure shown in fig. 2 is not limiting of the device and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.

As shown in fig. 2, a control program of an air conditioner may be included in a memory 1002 as one type of storage medium. In the apparatus shown in fig. 2, a processor 1001 may be used to call a control program of an air conditioner stored in a memory 1002 and perform the relevant step operations of the control method of the air conditioner of the following embodiment.

The embodiment of the invention also provides a control method of the air conditioner, which is applied to the air conditioner.

Referring to fig. 3, an embodiment of a control method of an air conditioner according to the present application is provided. In this embodiment, the control method of the air conditioner includes:

Step S10, controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening degree so as to enable the first heat exchanger to be in a condensation state and the second heat exchanger to be in an evaporation state;

specifically, step S10 is performed when the air conditioner is in the heating mode.

Under the state that the reversing valve operates at a first valve position and the electronic expansion valve operates at a first opening, refrigerant flowing out of the compressor flows into the first heat exchanger, part of refrigerant flowing out of the first heat exchanger sequentially flows through the heat exchange part of the first one-way valve and the throttling component, and the other part of refrigerant flowing out of the first heat exchanger flows into the second heat exchanger and the air return port of the compressor after flowing through the first one-way valve, the electronic expansion valve and the second one-way valve and being converged with refrigerant flowing out of the throttling component, wherein the refrigerant flowing out of the first heat exchanger 4 does not flow through a branch where the third one-way valve is located under the unidirectional cutoff effect of the third one-way valve. The high-pressure and high-temperature refrigerant discharged by the compressor flows into the first heat exchanger, the first heat exchanger is in a condensation state, the electronic expansion valve runs at a smaller first opening degree to throttle, decompress and cool the refrigerant flowing through, the low-temperature and low-pressure refrigerant can flow into the second heat exchanger and then flow back to the compressor, and the second heat exchanger is in an evaporation state.

Step S20, when the operation of the air conditioner meets a first defrosting condition, controlling the electronic expansion valve to operate at a second opening degree so as to increase the temperature of the second heat exchanger; wherein the second opening is larger than the first opening.

The first defrosting condition is specifically a condition that needs to be met by a state parameter of the air conditioner and/or an environmental parameter of an environment in which the air conditioner is located when the second heat exchanger in an evaporation state has a frosting risk (the second heat exchanger has a frosting tendency or has frosted).

When the air conditioner meets the first defrosting condition, the reversing valve can be controlled to maintain the first valve position to operate and the electronic expansion valve is controlled to be increased from the first opening to the second opening to operate.

The first opening degree and the second opening degree may be fixed opening degrees set in advance, or may be parameters determined according to an actual operation state of the air conditioner. Specifically, the first opening is smaller than or equal to a preset opening threshold, and the first opening is larger than the second opening threshold.

In this embodiment, the temperature of the second heat exchanger and the temperature of the heat exchanging portion are obtained; and determining the second opening according to the temperature of the second heat exchanger and the temperature of the heat exchange part. Specifically, a temperature difference value between the temperature of the second heat exchanger and the frosting temperature can be determined, and the second opening degree is determined according to the temperature difference value and the temperature of the heat exchange part. The different temperature difference values and the temperature of the heat exchange part correspond to different second opening degrees. The reversing valve can absorb heat of the heating component when the refrigerant flowing through the heat exchange part in the state of the first valve position so as to improve the temperature of the refrigerant flowing into the second heat exchanger, and the reversing valve can be beneficial to defrosting the second heat exchanger while radiating the heat of the heating component. In this embodiment, the throttle opening is not adjustable. In other embodiments, the throttle component may increase the opening degree operation when the air conditioner operation satisfies the first defrosting condition.

And when the reversing valve operates at a first valve position and the electronic expansion valve operates at a second opening, refrigerant flowing out of the compressor flows into the first heat exchanger, a small part of refrigerant flowing out of the first heat exchanger flows through the first one-way valve, the heat exchange part and the throttling part in sequence, and a large part of refrigerant flowing out of the first heat exchanger flows through the first one-way valve, the electronic expansion valve and the second one-way valve and then flows into the second heat exchanger and the return port of the compressor after being converged with refrigerant flowing out of the throttling part. The high-pressure high-temperature refrigerant discharged by the compressor flows into the first heat exchanger, the first heat exchanger is in a condensation state, heating of the indoor environment is maintained, the electronic expansion valve operates at a larger second opening degree to throttle and reduce pressure of the refrigerant flowing through the electronic expansion valve, the temperature of the refrigerant flowing out of the electronic expansion valve into the second heat exchanger is higher than that of the refrigerant flowing out of the electronic expansion valve into the second heat exchanger in a heating mode, the relatively high-temperature refrigerant flows into the second heat exchanger, the frosting risk of the refrigerant can be reduced (frost is avoided or the frost formed on the surface of the second heat exchanger is melted), and the refrigerant flowing out of the second heat exchanger can flow back to the compressor. Wherein the second heat exchanger may be in a heat release state when the second opening is the maximum opening. When the second opening is smaller than the maximum opening, the second heat exchanger can be in a weak evaporation state, but the temperature of the second heat exchanger in the first defrosting mode is higher than that of the second heat exchanger in the heating mode. Specifically, the temperature of the second heat exchanger in the first defrosting mode is higher than the freezing point temperature.

And when the operation of the air conditioner does not meet the first defrosting condition, controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening.

According to the control method of the air conditioner, which is provided by the embodiment of the invention, in the process that the first heat exchanger releases heat to raise the indoor temperature, the air conditioner does not need to switch the heat exchange state of the second heat exchanger through the reversing of the reversing valve to melt the frost of the second heat exchanger, the first heat exchanger can maintain the indoor environment in the condensation state to release heat, the indoor temperature fluctuation can be effectively avoided, the running noise of the air conditioner caused by the reversing of the reversing valve is reduced, and the user comfort is effectively improved. The electronic expansion valve and the throttling component are matched, so that the temperature of the refrigerant in the heat exchange part is not too low, and condensation of the heat exchange part in the heat dissipation process of the heating component is avoided.

Further, in this embodiment, the first defrosting condition includes a first condition or a second condition, and a frost formation risk of the second heat exchanger corresponding to the first condition is smaller than a frost formation risk of the second heat exchanger corresponding to the second condition; the second opening corresponding to the first condition is smaller than the second opening corresponding to the second condition.

Specifically, in this embodiment, the temperature of the second heat exchanger is defined as T3, the reference temperature is defined as T30, the duration of operation of the compressor is defined as T, T30 is specifically determined according to temperature data of the second heat exchanger detected in a period of time when the duration of operation of the compressor is less than or equal to a preset period of time, and specifically, T30 is a minimum temperature value of the second heat exchanger in the period of time. Based on this, the first condition and the second condition are as follows:

First condition: t > T1, T3< a, T30-T3> b;

Second condition: t > T2, T30-T3> c;

wherein t1, t2, a, b and c are all threshold values, t1 is smaller than t2, and b is smaller than c.

The electronic expansion valve has smaller opening degree when the frosting risk is smaller, which is beneficial to delaying frosting of the second heat exchanger, reducing heating quantity loss, reducing frosting risk and further improving user comfort of the space where the first heat exchanger is located. When the frosting risk is large, the opening degree of the electronic expansion valve is large, so that the refrigerant flowing into the second heat exchanger has enough heat to eliminate the frosting risk, and the frosting risk is further reduced while the indoor comfort is maintained.

Further, based on the above embodiment, another embodiment of the control method of the air conditioner of the present application is provided.

In this embodiment, referring to fig. 4, after step S10, the method further includes:

Step S30, when the operation of the air conditioner meets a second defrosting condition, controlling the reversing valve to operate at a second valve position and controlling the electronic expansion valve to operate at the first opening degree so as to enable the second heat exchanger to be in a condensation state; the frosting degree of the second heat exchanger represented by the first frosting condition is smaller than that of the second heat exchanger represented by the second frosting condition.

The extent of frosting here can be characterized in particular by the thickness of the frost layer on the surface of the second heat exchanger.

Specifically, the second heat exchanger corresponding to the second defrosting condition already has a frost layer larger than the preset thickness.

In this embodiment, the temperature of the second heat exchanger is defined as T3, the reference temperature is defined as T30, and T30 is specifically determined according to temperature data of the second heat exchanger detected during the duration of the continuous operation of the compressor being less than or equal to a preset duration, and specifically, T30 is a minimum temperature value of the second heat exchanger during the time period. Based on this, the second defrosting condition is T3< d, T30-T3> e, where e is greater than c, d is less than a, a is greater than or equal to the freezing temperature, and d is less than the freezing temperature.

Specifically, when the operation of the air conditioner meets the second defrosting condition, the compressor is stopped, and the reversing valve is switched from the first valve position to the second valve position and then the compressor is started.

When the reversing valve operates at the second valve position, the first opening degree can be determined according to the temperature of the heat exchange part and the temperature and humidity of the environment where the reversing valve is positioned, so that condensation of the heat exchange part can be effectively avoided.

Under the state that the reversing valve operates at the second valve position and the electronic expansion valve operates at the first opening, refrigerant flowing out of the compressor flows into the second heat exchanger, the refrigerant flowing out of the second heat exchanger is forbidden to flow into a branch where the second one-way valve is located under the unidirectional stop effect of the second one-way valve, all the refrigerant flowing out of the second heat exchanger flows through the throttling part to enter the heat exchange part, wherein the throttling part does not have a throttling effect on the refrigerant flowing in the direction, the refrigerant flowing out of the heat exchange part is forbidden to flow into the branch where the first one-way valve is located under the unidirectional stop effect of the first one-way valve, but flows into the electronic expansion valve to flow into the third one-way valve to be evaporated after being throttled and depressurized, and the refrigerant flowing out of the first heat exchanger flows back into the compressor. The first heat exchanger absorbs heat in an evaporation state, the second heat exchanger releases heat in a condensation state, and the high-temperature refrigerant in the second heat exchanger releases heat to melt frost on the surface of the second heat exchanger.

In this embodiment, when the frosting of the second heat exchanger is not serious, on the basis that the frosting risk is reduced in a manner that the reversing valve does not reverse the opening degree increased by the electronic expansion valve, when the frosting of the second heat exchanger is serious, the reversing valve switches the second heat exchanger to a condensation state in a reversing manner so as to ensure that the second heat exchanger has enough heat to melt the frost, thereby eliminating the influence of the defrosting on the reliability and heating effect of the air conditioner and ensuring the normal operation of the air conditioner.

Further, based on any one of the above embodiments, a further embodiment of the control method of the air conditioner of the present application is provided. In this embodiment, referring to fig. 5, after step S10, the method further includes:

Step S101, when the first environmental temperature of the environment where the air conditioner is located is smaller than a preset environmental temperature, identifying whether the operation of the air conditioner meets the second defrosting condition;

The first ambient temperature may include an ambient temperature of an environment in which the first heat exchanger is located and/or an ambient temperature of an environment in which the second heat exchanger is located. The first heat exchanger is arranged indoors, and the ambient temperature of the environment where the first heat exchanger is arranged can be detected by a temperature sensor arranged at the air return opening of the air conditioner.

The preset environmental temperature is an environmental temperature critical value for distinguishing the frosting risk of the second heat exchanger of the current air conditioner under the current working condition. When the first environmental temperature is smaller than the preset environmental temperature, the risk of frosting under the current working condition can be considered to be large; when the first ambient temperature is greater than or equal to the preset ambient temperature, the risk of frosting under the current working condition can be considered to be relatively low.

In this embodiment, the first heat exchanger is disposed indoors, and the second heat exchanger is disposed outdoors, so that when the indoor ambient temperature is less than the first preset ambient temperature or the outdoor ambient temperature is less than the second preset ambient temperature, whether the air conditioner satisfies the second defrosting condition can be identified.

And when the second defrosting condition is judged to be met, controlling the reversing valve to operate at a second valve position and controlling the electronic expansion valve to operate at the first opening. And when the second defrosting condition is judged not to be met, the reversing valve can be controlled to maintain the first valve position to operate and the electronic expansion valve can be controlled to operate at the first opening. Or upon determining that the second defrosting condition is not satisfied, it may be identified whether the first defrosting condition is satisfied.

Step S102, when the first ambient temperature is greater than or equal to the preset ambient temperature and when the operation of the air conditioner does not meet a first preset condition, identifying whether the operation of the air conditioner meets one of the first defrosting condition and the second defrosting condition; the first preset condition represents that the second heat exchanger frosts before the air conditioner is started;

And step S103, when the first ambient temperature is greater than or equal to the preset ambient temperature and the air conditioner meets the first preset condition, controlling the reversing valve to operate at a second valve position and controlling the electronic expansion valve to operate at the first opening degree so as to enable the second heat exchanger to be in a condensation state.

The first preset condition may be a target condition (for example, a target number relationship or a target interval) that needs to be reached by an environmental parameter and/or a state parameter of the air conditioner itself when the air conditioner is frosted before being started.

In this embodiment, the first preset condition includes:

The temperature difference value between the second environment temperature of the environment where the second heat exchanger is located and the temperature of the second heat exchanger is larger than a target temperature difference threshold value;

condition 2, the temperature of the second heat exchanger is less than a first preset temperature; and

And 3, the operation time length of the air conditioner is longer than a second preset time length.

In this embodiment, the second heat exchanger is disposed outdoors, and the second ambient temperature is an outdoor ambient temperature. In this embodiment, the target temperature difference threshold is determined from the second ambient temperature. The different second ambient temperatures correspond to different target temperature difference thresholds. Specifically, a corresponding relationship between the second environmental temperature and the target temperature difference threshold may be preset, and the corresponding relationship may be a calculation relationship, a mapping relationship, or the like. Based on the correspondence, a target temperature difference threshold corresponding to the current second ambient temperature may be determined.

In other embodiments, the first preset condition may also include condition 1 and condition 3 and not condition 2. Or other conditions other than the conditions 1,2 and 3 can be included, for example, the temperature difference value between the temperature of the second heat exchanger before starting and the temperature of the second heat exchanger after starting is smaller than a preset threshold value.

When the first ambient temperature is greater than or equal to the preset ambient temperature and the operation of the air conditioner does not meet the first preset condition, the air conditioner can be considered to have no frosting before being started, whether the air conditioner meets one of the first frosting condition and the second frosting condition is recognized, and when the air conditioner meets the first frosting condition and the second frosting condition, the operation of the reversing valve and the electronic expansion valve is controlled according to a corresponding mode so as to reduce the frosting risk of the second heat exchanger.

When the first ambient temperature is greater than or equal to the preset ambient temperature and the operation of the air conditioner meets the first preset condition, the air conditioner can be considered to be frosted before being started, the frosting condition is not judged any more, the reversing valve is directly controlled to operate at the second valve position, the electronic expansion valve is controlled to operate at the first opening, and the condensation state of the second heat exchanger releases heat to melt the frost on the surface of the second heat exchanger.

In this embodiment, when the environmental temperature is low and the frost formation risk is high, whether the second defrosting condition is met is preferentially judged, so that the defrosting operation of the air conditioner is guaranteed to be capable of providing sufficient heat for melting the frost of the second heat exchanger, the normal operation of the air conditioner is prevented from being influenced by the excessively thick frost layer, and the low-temperature heating performance of the air conditioner is effectively improved. When the frosting risk is high and the frosting is judged to be generated before the air conditioner is started through the first preset condition when the environmental temperature is low, the frosting condition is judged not to be judged, the second heat exchanger is directly enabled to enter a condensation state through the cooperation of the reversing valve and the electronic expansion valve, the second heat exchanger is guaranteed to have enough heat to melt the frost before the air conditioner is started, the frosting effect of the frost layer in the follow-up operation process of the air conditioner is prevented from being influenced, and the low-temperature heating performance of the air conditioner is further improved. When the frost risk is high and the frost is not generated before the air conditioner is started up through the first preset condition, the first defrosting condition and the second defrosting condition are combined to judge whether the air conditioner needs defrosting operation or not, and a proper mode can be selected for different frost degrees of the second heat exchanger to reduce the frost risk of the second heat exchanger, so that the first heat exchanger is kept condensed when the frost degree is low to ensure the indoor comfort to be guaranteed preferentially, and the second heat exchanger is switched to be condensed when the frost degree is high to ensure enough heat to melt the frost of the second heat exchanger, and the indoor comfort and the low-temperature heating performance of the air conditioner are guaranteed to be effectively combined.

Further, based on any one of the above embodiments, another embodiment of the control method of the air conditioner of the present application is provided. After step S20 or after step S30, further comprising: and when the operation of the electronic expansion valve reaches the defrosting end condition, returning to the step of controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening.

The defrosting end condition characterizes that the frosting risk of the second heat exchanger is eliminated. Specifically, the defrosting end condition may include that the defrosting time period is longer than a preset time period and/or that the temperature of the second heat exchanger is greater than a preset temperature. And starting timing when the defrosting duration is switched from the electronic expansion valve to the second opening operation or the reversing valve is switched to the second valve position operation.

In the embodiment, the first defrosting condition and the second defrosting condition are circularly based in the running process of the air conditioner, so that the effective elimination of the frosting risk of the second heat exchanger is guaranteed, and the effective compromise of indoor comfort and low-temperature heating performance of the system can be realized.

Further, in this embodiment, the first defrosting condition includes a first condition or a second condition, and a frost formation risk of the second heat exchanger corresponding to the first condition is smaller than a frost formation risk of the second heat exchanger corresponding to the second condition. The first condition and the second condition are the same concept as the first condition and the second condition mentioned above, and are not described herein. Referring to fig. 6, the step of identifying whether the air conditioner operation satisfies one of the first defrosting condition and the second defrosting condition includes:

Step S1021, when the defrosting condition which is met by the air conditioner last time is the first condition, identifying whether the operation of the air conditioner meets the second condition;

Step S1022, when the defrosting condition that the air conditioner last meets is the second condition and the second preset condition is not met and the operation duration of the air conditioner is less than a third preset duration, identifying whether the air conditioner meets the first condition;

Step S1023, when the defrosting condition which is met by the air conditioner last time is the second condition and the second preset condition is met, or when the defrosting condition which is met by the air conditioner last time is the second condition and the second preset condition is not met and the operation duration of the air conditioner is longer than the third preset duration, identifying whether the air conditioner meets the second defrosting condition; the second preset condition comprises that the time length of defrosting of the air conditioner, which is last met by the second condition, is longer than or equal to a first preset time length, and the temperature of the second heat exchanger is smaller than a first preset temperature, wherein the first preset time length is smaller than a third preset time length, the first preset time length is smaller than the second preset time length, and the third preset time length is longer than the second preset time length.

And when the air conditioner with the second preset condition representation operates for defrosting last time, the surface frost layer of the second heat exchanger is thicker, and the risk of frosting again is higher.

Specifically, in this embodiment, when the compressor is started in the heating mode, step S10 may be executed, after step S10, when the first ambient temperature is greater than or equal to the preset ambient temperature, and when the operation of the air conditioner does not meet the first preset condition, if there is no defrosting operation (the reversing valve maintains the first valve position and the electronic expansion valve maintains the first opening) before the current time after the air conditioner is started, whether the operation of the air conditioner meets the first condition is identified; if the defrosting operation does not exist before the current moment after the air conditioner is started, identifying whether the operation of the air conditioner meets a first condition or not; if the air conditioner is started and has defrosting operation before the current moment, determining target defrosting conditions in the first condition, the second condition and the third condition according to the defrosting conditions which are met last time by the air conditioner in the first condition, the second condition and the third condition, and identifying whether the air conditioner meets the target defrosting conditions. Specifically, the target defrosting condition may be determined according to steps S1021 to S1023. The compressor is required to stop running during the process of switching the reversing valve from the first valve position to the second valve position.

In this embodiment, by the above manner, the defrosting condition and the second preset condition met by the previous air conditioner can accurately represent the frosting degree of the second heat exchanger after the previous defrosting is finished, so that the defrosting condition currently used for identifying whether the air conditioner needs to perform defrosting operation is selected based on the defrosting condition and the second preset condition met by the previous air conditioner, which is favorable for improving the accuracy of selecting the defrosting operation mode of the air conditioner, ensuring the accurate matching of the defrosting operation and the actual defrosting risk of the air conditioner, and further realizing the effective compromise of maintaining indoor comfort, reducing noise and improving the low-temperature heating performance of the air conditioner.

In order to better understand the process of selecting different defrosting conditions in the above embodiment, the following description will be given with a specific example:

1. heating is started;

2. detecting whether T4 is less than-7 ℃ or T1 is less than 14 ℃, and detecting whether the next defrosting meets the second defrosting condition according to the condition that T4 is the ambient temperature of the second heat exchanger and T1 is the ambient temperature of the first heat exchanger;

3. When T4 < -7 ℃ or T1 < 14 ℃ is not met, detecting T4-T3> (0.5T4+3) and T3< -12, and the operation time is longer than 20 minutes, if the operation time is met, the condenser is provided with frost before being started, and the condenser directly enters a defrosting mode III (the reversing valve operates at a second valve position and the electronic expansion valve operates at a first opening degree);

4. When the step 2 and the step 3 are not met, judging whether a first condition is met, and entering a defrosting mode I (the reversing valve operates at a first valve position and the electronic expansion valve operates at a smaller second opening) if the first condition is met, and continuing heating if the first condition is not met;

5. The next defrosting priority judges whether a second condition is met after the defrosting mode I is finished, and enters a defrosting mode II (a reversing valve operates at a first valve position and an electronic expansion valve operates at a larger second opening), and whether the first condition is met is not met;

6. After the second defrosting mode is finished, firstly judging that the defrosting time (namely the defrosting time corresponding to the second condition) reaches the preset time (namely the first preset time, for example, 10 min), and T3 (the temperature of the second heat exchanger) is less than 8 ℃, wherein the next defrosting enters the third defrosting mode (namely, judging whether the second defrosting condition is met or not), if not, judging that the total running time T is more than or equal to ts3 (480 min);

7. The total operation time t is more than or equal to ts3, the next defrosting enters a defrosting mode III, if not, the defrosting mode I is entered (namely whether the first condition is met or not is judged), wherein t is the operation time of the air conditioner, ts3 is a third preset time, and ts3 can be 480min;

8. The third mode of primary defrosting is performed as a cycle;

The first defrosting mode and the second defrosting mode are non-stop defrosting, the four-way valve is not reversed, the defrosting mode III is traditional reverse circulation defrosting, the first defrosting mode comprises a defrosting mode I or a defrosting mode II, and the second defrosting mode comprises a defrosting mode III.

Further, based on any one of the above embodiments, still another embodiment of the control method of the air conditioner of the present application is provided. The first defrosting condition includes a first condition or a second condition, and the frosting risk of the second heat exchanger corresponding to the first condition is smaller than the frosting risk of the second heat exchanger corresponding to the second condition, and after step S20, the method further includes:

step S40, when the operation of the air conditioner meets the first condition, controlling a fan corresponding to the first heat exchanger to operate at a reduced rotating speed, and/or controlling the compressor to operate at a first frequency;

specifically, when the operation of the air conditioner meets the first condition, in the process that the reversing valve operates at a first valve position and the electronic expansion valve operates at a second opening, the fan corresponding to the first heat exchanger is controlled to operate at a reduced rotating speed, and/or the compressor is controlled to operate at a first frequency.

Based on the method, the frosting risk of the second heat exchanger corresponding to the first condition is low, and at the moment, the fan corresponding to the first heat exchanger is kept on and runs at a reduced rotating speed, so that the first heat exchanger is kept in a condensation state, heat exchange is reduced, and the refrigerant entering the second heat exchanger has enough heat to quickly eliminate the frosting risk; at the moment, the reduction of the frequency of the compressor to the first frequency is beneficial to improving the evaporation temperature of the second heat exchanger, so that the temperature of the second heat exchanger is effectively improved by matching with the electronic expansion valve to operate at the second opening degree to eliminate the frosting risk of the second heat exchanger, and meanwhile, the heat of the first heat exchanger is not reduced too much to ensure the user comfort of the space where the first heat exchanger is located.

Step S50, when the operation of the air conditioner meets the second condition, controlling a fan corresponding to the first heat exchanger to be closed, and/or controlling the compressor to be reduced to a second frequency operation; wherein the first frequency is less than the second frequency.

Specifically, when the operation of the air conditioner meets the second condition, in the process that the reversing valve operates at a first valve position and the electronic expansion valve operates at a second opening, the fan corresponding to the first heat exchanger is controlled to be closed, and/or the compressor is controlled to be reduced to a smaller frequency for operation.

Based on the situation, the frosting risk of the second heat exchanger corresponding to the second condition is higher, and at the moment, the fan corresponding to the first heat exchanger is closed, so that the first heat exchanger is guaranteed to maintain a condensation state and heat exchange is reduced, and the refrigerant entering the second heat exchanger is good for having enough heat to quickly eliminate the frosting risk; and at the moment, the reduction of the frequency of the compressor to the second frequency is beneficial to further improving the evaporation temperature of the second heat exchanger, so that the temperature of the second heat exchanger is effectively improved by matching with the electronic expansion valve to operate at the second opening degree, and the frosting risk of the second heat exchanger is eliminated.

Further, the defrosting operation process when the operation of the air conditioner meets the first condition is defined as a defrosting mode one, the defrosting operation process when the operation of the air conditioner meets the second condition is defined as a defrosting mode two, the operation of the indoor electric auxiliary heat module, the fan corresponding to the first heat exchanger, the compressor, the reversing valve, the fan corresponding to the second heat exchanger and the electronic expansion valve respectively corresponding to the operation before and after defrosting in the defrosting process can be specifically referred to as fig. 7, wherein fig. 7 (a) is a part operation time sequence diagram in the defrosting mode, and fig. 7 (b) is a part operation time sequence diagram in the defrosting mode two. Based on the above, the effective combination of defrosting and indoor comfort is realized through the operation cooperation of all the components.

Further, in this embodiment, when the operation of the air conditioner meets the second condition, the step of controlling the fan corresponding to the first heat exchanger to be turned off includes:

And when the operation of the air conditioner meets the second condition, controlling the corresponding fan of the first heat exchanger to be closed at intervals of a third preset duration.

The third preset duration may be a preset fixed duration, or may be a duration determined according to an actual operation condition of the air conditioner, for example, the third preset duration may be determined according to a temperature of the first heat exchanger.

And when the air conditioner meets the second condition, the corresponding fan of the first heat exchanger is turned off in a delayed manner, so that the phenomenon that the temperature of the indoor heat exchanger is too high due to the fact that the fan stops when defrosting begins is avoided.

And when the operation of the air conditioner meets the second condition, after the step of controlling the fan corresponding to the first heat exchanger to be closed, the method further comprises the following steps:

The fourth preset duration may be a preset fixed duration, or may be a duration determined according to an actual operation condition of the air conditioner, for example, the fourth preset duration may be determined according to a temperature of the first heat exchanger.

When the fan defrosting process corresponding to the first heat exchanger is closed, the fan is started first after defrosting is finished, then the electronic expansion valve is delayed to act, the situation that the opening of the electronic expansion valve is too small, the rotating speed of the indoor fan does not reach the preset rotating speed, the temperature of the first heat exchanger rises too fast, the problem that the air conditioner stops due to frequency limiting is solved, and the system running stability is improved.

In addition, the embodiment of the invention also provides a storage medium, wherein the storage medium stores a control program of the air conditioner, and the control program of the air conditioner realizes the relevant steps of any embodiment of the control method of the air conditioner when being executed by a processor.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. The control method of the air conditioner is characterized in that the air conditioner comprises a refrigerant circulation loop, the refrigerant circulation loop comprises a compressor, a reversing valve, a first heat exchanger, a throttling part, a second heat exchanger, an electronic expansion valve and a heat exchange part, the heat exchange part is arranged between the first heat exchanger and the throttling part, two ends of the throttling part and the heat exchange part which are connected in series are connected with two ends of the electronic expansion valve, the heat exchange part is in heat exchange connection with a heating part, and the control method of the air conditioner comprises the following steps:

wherein the second opening is larger than the first opening.

2. The control method of an air conditioner according to claim 1, wherein the first defrosting condition includes a first condition or a second condition, and a risk of defrosting of the second heat exchanger corresponding to the first condition is smaller than a risk of defrosting of the second heat exchanger corresponding to the second condition;

3. The method of controlling an air conditioner as claimed in claim 1, wherein after the step of controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening degree, further comprising:

4. The method of controlling an air conditioner as claimed in claim 3, wherein after the step of controlling the reversing valve to operate at a first valve position and controlling the electronic expansion valve to operate at a first opening degree, further comprising:

5. The method of controlling an air conditioner according to claim 4, wherein after the step of controlling the electronic expansion valve to operate at a second opening degree when the air conditioner operation satisfies a first defrosting condition, or after the step of controlling the reversing valve to operate at a second valve position and controlling the electronic expansion valve to operate at the first opening degree when the air conditioner operation satisfies a second defrosting condition, further comprising:

6. The method of controlling an air conditioner according to claim 5, wherein the first defrosting condition includes a first condition or a second condition, a risk of defrosting of the second heat exchanger corresponding to the first condition is smaller than a risk of defrosting of the second heat exchanger corresponding to the second condition, and the step of identifying whether the air conditioner operation satisfies one of the first defrosting condition and the second defrosting condition includes:

7. The method of controlling an air conditioner as set forth in claim 4, wherein the first preset condition includes:

8. The method of controlling an air conditioner as claimed in claim 7, wherein the target temperature difference threshold is determined according to the second ambient temperature.

9. The control method of an air conditioner according to any one of claims 1 to 8, wherein the first defrosting condition includes a first condition or a second condition, a frosting risk of the second heat exchanger corresponding to the first condition is smaller than a frosting risk of the second heat exchanger corresponding to the second condition, and the step of controlling the electronic expansion valve to operate at a second opening degree when the air conditioner operation satisfies the first defrosting condition includes:

wherein the first frequency is less than the second frequency.

10. The method of controlling an air conditioner as set forth in claim 9, wherein the step of controlling the fan corresponding to the first heat exchanger to be turned off when the operation of the air conditioner satisfies the second condition comprises:

11. An air conditioner, characterized in that the air conditioner comprises:

A control device, the control device comprising: a memory, a processor, and a control program of an air conditioner stored on the memory and operable on the processor, which when executed by the processor, realizes the steps of the control method of an air conditioner according to any one of claims 1 to 10.

12. The air conditioner as set forth in claim 11, further comprising:

13. A storage medium, wherein a control program of an air conditioner is stored on the storage medium, and the control program of the air conditioner, when executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 10.