CN112050374B - Control method and control device for defrosting of air conditioner and air conditioner - Google Patents

Abstract

The application relates to a control method and a control device for defrosting of an air conditioner and the air conditioner. The control method comprises the steps of acquiring the temperatures of two or more indoor coils when the air conditioner operates in a heating mode; and controlling the air conditioner to enter a defrosting mode according to the maximum value and the minimum value of the two or more indoor coil temperatures. The embodiment of the disclosure provides a method for defrosting judgment and control by combining with the temperature state change of an indoor coil pipe in the running process of an air conditioner, which can more accurately control the air conditioner to trigger and execute a defrosting process, and reduce the problems of false triggering, frequent triggering and the like of the defrosting process in the related technology.

Description

A control method, control device and air conditioner for defrosting an air conditioner

technical field

The present application relates to the technical field of air conditioner defrosting, for example, to a control method, a control device and an air conditioner for air conditioner defrosting.

Background technique

With the improvement of people's living standards, air-conditioning equipment has entered thousands of households. One of the problems is that the outdoor unit of the air conditioner is frosted and frozen when the air conditioner is operating in a severe cold climate. When the air conditioner operates in a low temperature area or an area with strong wind and snow, the water condensed on the outer surface of the condenser of the outdoor unit will drip onto the chassis. When the air conditioner is running for a long time, the condenser and chassis of the air conditioner will be damaged. When there is an icing problem, the ice layer condensed on the outdoor unit will hinder the heat exchange between the internal refrigerant and the outdoor environment, which will reduce the cooling efficiency of the air conditioner. The additional consumption and user usage cost increase.

Therefore, in order to solve the problem that the outdoor unit of the air conditioner freezes, some existing air conditioners are equipped with a defrosting function. For example, the outdoor unit is heated by a heating device installed in the outdoor unit, or the high-temperature refrigerant discharged from the compressor is used. Defrost and thaw the outdoor heat exchanger. Here, before the air conditioner activates the defrost function, the air conditioner generally uses the combination of the temperature of the outer coil detected by the outdoor sensor and the frost point temperature to determine whether it has reached a temperature condition that is easy to condense frost, and then determines whether to activate the defrost function.

In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art: the air conditioner generally uses the outdoor ambient temperature compared with the frost point temperature as the judgment condition for whether the air conditioner needs to be defrosted; The factors of the degree of frost include not only the external environmental factors, but also the influence factors of the state of the air conditioner itself; therefore, in some cases, such as the change of the parameters such as the outdoor ambient temperature before and after the air conditioner defrost is small, because the air conditioner has its own The working state of the components will also change. If you judge and control whether the air conditioner needs to be defrosted in this way, there will actually be a large error with the actual frosting state of the air conditioner, which will easily lead to false triggering of the defrosting function and frequent occurrences. Therefore, it cannot meet the needs of precise control of the air conditioner to trigger the defrost function.

SUMMARY OF THE INVENTION

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor to identify key/critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide a control method, a control device, and an air conditioner for air conditioner defrosting, so as to solve the technical problems of false triggering, frequent triggering, etc. in the related art of the air conditioner triggering the defrosting function.

In some embodiments, the control method includes:

acquiring two or more indoor coil temperatures when the air conditioner operates in a heating mode;

The air conditioner is controlled to enter a defrost mode according to a maximum value and a minimum value of the two or more indoor coil temperatures.

In some embodiments, the control device includes:

a first obtaining module, configured to obtain two or more indoor coil temperatures when the air conditioner operates in a heating mode;

A defrost control module is configured to control the air conditioner to enter a defrost mode according to a maximum value and a minimum value of the two or more indoor coil temperatures.

In some embodiments, the air conditioner includes the control device described above.

Some technical solutions provided by the embodiments of the present disclosure can achieve the following technical effects:

The control method for air conditioner defrosting provided by the embodiments of the present disclosure can judge whether the air conditioner enters the defrost mode according to the temperature of two or more indoor coils in the heating mode of the air conditioner, compared with the related art based on outdoor A control method for performing defrosting judgment on ambient temperature, the embodiment of the present disclosure provides a method for performing defrosting judgment and control in combination with the temperature state change of an indoor coil during the operation of the air conditioner, which can more accurately control the air conditioner to trigger and execute the defrosting process, The occurrence of problems such as false triggering and frequent triggering of the defrosting process in the related art is reduced.

The foregoing 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 the accompanying drawings, which are not intended to limit the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings do not constitute a limitation of scale, and in which:

1 is a schematic flowchart of a control method for air conditioner defrosting provided by an embodiment of the present disclosure;

2 is a schematic flowchart of a control method for air conditioner defrosting provided by another embodiment of the present disclosure;

3 is a schematic structural diagram of a control device for air conditioner defrosting provided by an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

Detailed ways

In order to understand the features and technical contents 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, which are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, numerous 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 in order to simplify the drawings.

FIG. 1 is a schematic flowchart of a control method for defrosting an air conditioner provided by an embodiment of the present disclosure.

As shown in FIG. 1 , an embodiment of the present disclosure provides a control method for defrosting an air conditioner, including:

S101. When the air conditioner operates in a heating mode, acquire the temperatures of two or more indoor coils;

Generally, the problem of frost and frost on the outdoor unit of the air conditioner mainly occurs in the severe cold climate in winter. At this time, the user generally sets the air conditioner to run in the heating mode to use the air conditioner to heat the indoor environment; therefore, this The control method for air conditioner defrosting of the disclosed embodiment is a related control flow executed when the air conditioner operates in a heating mode.

The indoor unit of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used to detect the real-time temperature of the coil of the indoor unit; in step S101, the real-time temperature of the coil detected by the temperature sensor is obtained and used as the indoor coil temperature;

Optionally, the two or more indoor coil temperatures include: indoor coil temperatures detected in two or more detection cycles.

Here, the air conditioner detects the temperature of the indoor coil of the indoor unit through the temperature sensor, which can be performed in multiple consecutive cycles, such as 5 minutes as a detection cycle or 10 minutes as a detection cycle, etc.; wherein, in each detection cycle The temperature of two or more indoor coils can be detected. For example, in the detection period of 5 minutes, the temperature of the indoor coils can be detected every 1 minute, and the data of the temperature of 5 indoor coils can be obtained.

S102. Control the air conditioner to enter a defrosting mode according to the maximum value and the minimum value of the two or more indoor coil temperatures.

Optionally, the maximum value among the two or more indoor coil temperatures includes: the maximum indoor coil temperature t _max of the current detection period and the maximum indoor coil temperature T _max of all detection periods;

For example, if the current detection cycle is the Nth detection cycle, the maximum value _tmax of the indoor coil temperature in the current detection cycle is the maximum value among two or more indoor coil temperatures in the Nth detection cycle;

The maximum indoor coil temperature T _{max of all detection cycles is the maximum value of all indoor coil temperature maximum values t max in} the 1st to Nth detection cycles; if N is 3, within the first detection cycle The maximum indoor coil temperature t _max1 is 45°C, the maximum indoor coil temperature t _max2 in the second detection cycle is 55°C, and the maximum indoor coil temperature t _max3 in the third detection cycle is 47°C , then the maximum indoor coil temperature T _max of all detection cycles is the maximum indoor coil temperature t _max2 in the second detection cycle;

The minimum value among the two or more indoor coil temperatures includes: the minimum value t _min of the indoor coil temperature in the current detection cycle.

For example, if the current detection cycle is the Nth detection cycle, the minimum indoor coil temperature _tmin of the current detection cycle is the minimum value among two or more indoor coil temperatures in the Nth detection cycle.

In this way, the control method for air conditioner defrosting provided by the embodiments of the present disclosure can determine that the air conditioner enters the defrost mode according to the maximum and minimum values of two or more indoor coil temperatures in the heating mode of the air conditioner, Compared with the control method of defrosting judgment based on the outdoor ambient temperature in the related art, the embodiments of the present disclosure provide a method for defrosting judgment and control based on the temperature state change of the indoor coil during the operation of the air conditioner, which can be more accurate. Control the air conditioner to trigger and execute the defrosting process, and reduce the occurrence of problems such as false triggering and frequent triggering of the defrosting process existing in the related art.

In an optional embodiment, in step S102, controlling the air conditioner to enter the defrosting mode according to the maximum value and the minimum value of two or more indoor coil temperatures, including:

When the first temperature difference ΔT satisfies the first condition and the second temperature difference Δt satisfies the second condition, the air conditioner is controlled to enter the defrosting mode,

In the embodiment of the present disclosure, the first temperature difference ΔT can reflect the maximum temperature that the indoor coil can reach in the current detection cycle, which is affected by the different frosting degrees of the outdoor unit, and the maximum temperature that the indoor coil can reach in the entire operating cycle of the air conditioner. The difference of the highest temperature reached; the second temperature difference Δt can reflect the temperature fluctuation of the indoor coil in the cycle due to the influence of different frosting degrees of the outdoor unit in the current detection cycle; therefore, the embodiments of the present disclosure combine The influence of the air conditioner frost on the above two temperature fluctuations of the indoor coil temperature can be more accurately controlled to enter the defrost mode.

Or, in another optional embodiment, in step S102, controlling the air conditioner to enter the defrosting mode according to the maximum value and the minimum value of two or more indoor coil temperatures, including:

When the first temperature difference ΔT satisfies the first condition, the second temperature difference Δt satisfies the second condition, and the indoor ambient temperature t _room satisfies the third condition, the air conditioner is controlled to enter the defrosting mode.

In the embodiment of the present disclosure, the first temperature difference ΔT can reflect the maximum temperature that the indoor coil can reach in the current detection cycle, which is affected by the different frosting degrees of the outdoor unit, and the maximum temperature that the indoor coil can reach in the entire operating cycle of the air conditioner. The difference of the highest temperature reached; the second temperature difference Δt can reflect the temperature fluctuation of the indoor coil in the cycle due to the influence of different frosting degrees of the outdoor unit in the current detection cycle; the indoor ambient temperature t _room can be It can reflect the temperature impact of outdoor environment changes on the indoor environment, and can also reflect the changes in the outdoor environment that can affect the degree of frosting of the air conditioner; The influence of the above three temperature fluctuations of the temperature can more accurately control the air conditioner to enter the defrost mode.

In the above two optional embodiments, ΔT=T _max -t _max ; Δt=t _max -t _min .

Optionally, the first condition includes: ΔT>T1, where T1 is the first threshold; optionally, the value of T1 is 10°C.

Optionally, the second condition includes: Δt<T2, where T2 is the second threshold; optionally, the value of T2 is 5°C.

Optionally, the third condition includes: t _{roommax -} t _room > T3, where T3 is a third threshold, t _roommax is the maximum indoor ambient temperature in the current detection period, and t _room is the current indoor ambient temperature.

Optionally, the value of T3 is 10°C.

Here, the air conditioner is also provided with another temperature sensor, which can be used to detect the real-time temperature of the indoor environment as the indoor environment temperature.

FIG. 2 is a schematic flowchart of a control method for defrosting an air conditioner provided by another embodiment of the present disclosure.

As shown in FIG. 2 , the process steps of the control method for air conditioner defrosting provided by the embodiment of the present disclosure include:

S201. When the air conditioner operates in a heating mode, acquire two or more indoor coil temperatures in the current detection cycle;

Optionally, the temperature of the indoor coil is detected by a temperature sensor disposed at the coil of the indoor unit of the air conditioner;

S202, calling two or more indoor coil temperatures in other detection periods before the current detection period in the historical data;

In the embodiment of the present disclosure, the air conditioner saves the indoor coil temperature detected by the temperature sensor in different detection periods as historical data, so in step S202, the indoor coil temperature saved in the historical data can be called;

S203, determine the maximum indoor coil temperature t _max of the current detection period and the maximum indoor coil temperature T _max of all detection periods;

S204, determining the indoor coil temperature minimum value t _min of the current detection cycle;

S205, calculate ΔT=T _max -t _max , Δt=t _max -t _min ;

S206, judging that ΔT>T1 and Δt<T2, if yes, go to step S207, if no, the process ends;

S207, control the air conditioner to enter the defrosting mode;

In the embodiment of the present disclosure, since the specific defrosting method of the defrosting mode does not involve the innovative point of the present application, it will not be repeated;

S208, when the air conditioner meets the defrost exit condition, control the air conditioner to exit the defrost mode, and the air conditioner maintains a standby or shutdown state for a set interval;

Optionally, the defrosting exit condition is that the defrosting duration of the air conditioner defrosting mode reaches the set duration, for example, the set duration is 10 minutes, etc.;

Optionally, set the interval to 30 minutes;

S209, controlling the air conditioner to re-enter the heating mode.

In the embodiment of the present disclosure shown in FIG. 2 , after the defrosting mode of the air conditioner is completed, the air conditioner is forced to enter the heating mode again after a set interval of standby or shutdown, so that enough frost water melted in the defrosting mode can be obtained. It can be discharged from the outdoor unit in time to avoid the problem of re-condensation of frost water on the outdoor unit caused by the way of entering the heating mode immediately after the air conditioner is defrosted, which can effectively improve the defrosting effect of the air conditioner.

FIG. 3 is a schematic structural diagram of a control device for air conditioner defrosting provided by an embodiment of the present disclosure.

As shown in FIG. 3 , an embodiment of the present disclosure further provides a control device for defrosting an air conditioner, and the control device can be applied to an air conditioner, so that the air conditioner can execute the control procedures shown in the above embodiments; , the control device 3 includes:

The first obtaining module 31 is configured to obtain the temperature of two or more indoor coils when the air conditioner operates in the heating mode;

The defrost control module 32 is configured to control the air conditioner to enter a defrost mode based on the maximum and minimum values of the two or more indoor coil temperatures.

In an optional embodiment, the two or more indoor coil temperatures include: indoor coil temperatures detected in two or more detection cycles.

In an optional embodiment, the maximum value of the two or more indoor coil temperatures includes: the maximum indoor coil temperature t _max of the current detection period and the maximum indoor coil temperature T _max of all detection periods ; The minimum value of the two or more indoor coil temperatures includes: the minimum indoor coil temperature t _min of the current detection cycle.

In an optional embodiment, the defrost control module is configured to:

When the first temperature difference ΔT satisfies the first condition and the second temperature difference Δt satisfies the second condition, the air conditioner is controlled to enter the defrosting mode; or,

When the first temperature difference ΔT satisfies the first condition, the second temperature difference Δt satisfies the second condition, and the indoor ambient temperature t _room satisfies the third condition, controlling the air conditioner to enter the defrosting mode;

Wherein, ΔT=T _max -t _max ; Δt=t _max -t _min .

In an optional embodiment, the first condition includes: ΔT>T1, where T1 is the first threshold.

In an optional embodiment, the second condition includes: Δt<T2, where T2 is the second threshold.

In an optional embodiment, the third condition includes: t _{roommax -} t _room > T3, T3 is the third threshold, t _roommax is the maximum indoor ambient temperature in the current detection period, and t _room is the current indoor temperature ambient temperature.

In an optional embodiment, the control device 3 further includes a shutdown control module configured to:

After defrosting is completed, control the air conditioner to maintain the standby or shutdown state for the set interval, and re-enter the heating mode.

For the specific execution manner of the control procedure of the control device of the present application for controlling the air conditioner to be executed, reference may be made to the corresponding part of the embodiment of the foregoing control method, which will not be repeated here.

Embodiments of the present disclosure also provide an air conditioner, which includes and the control device provided in the foregoing embodiments.

Embodiments of the present disclosure further provide a computer-readable storage medium storing computer-executable instructions, where the computer-executable instructions are configured to execute the control methods for air conditioner defrosting provided in the foregoing embodiments.

Embodiments of the present disclosure also provide a computer program product, where the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, causes The computer executes the control method for air conditioner defrosting provided in the above embodiments.

The above-mentioned computer-readable storage medium may be a transient computer-readable storage medium, and may also be a non-transitory computer-readable storage medium.

An embodiment of the present disclosure also provides an electronic device, the structure of which is shown in FIG. 4 , and the electronic device includes:

At least one processor (processor) 400, a processor 400 is taken as an example in FIG. 4; and a memory (memory) 401, which may also include a communication interface (Communication Interface) 402 and a bus 403. The processor 400 , the communication interface 402 , and the memory 401 can communicate with each other through the bus 403 . Communication interface 402 may be used for information transfer. The processor 400 may invoke the logic instructions in the memory 401 to execute the control method for air conditioner defrosting provided in the above embodiments.

In addition, the above-mentioned logic instructions in the memory 401 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

As a computer-readable storage medium, the memory 401 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 400 executes functional applications and data processing by running the software programs, instructions and modules stored in the memory 401 , that is, to implement the control method for air conditioner defrosting in the above method embodiments.

The memory 401 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 401 may include high-speed random access memory, and may also include non-volatile memory.

The technical solutions of the embodiments of the present disclosure may be embodied in the form of software products, and the computer software products are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: U disk, removable 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 codes, and can also be a transient storage medium.

The foregoing description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions 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. The scope of the disclosed embodiments includes the full scope of the claims, along with all available equivalents of the claims. When used in this application, although the terms "first," "second," etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without changing the meaning of the description, a first element could be termed a second element, and similarly, a second element could be termed a first element, so long as all occurrences of "the first element" were consistently renamed and all occurrences of "the first element" were named consistently The "second element" can be renamed consistently. The first element and the second element are both elements, but may not be the same element. Also, the terms used in this application are used to describe the embodiments only and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a" (a), "an" (an) and "the" (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 include any and all possible combinations of one or more of the associated listings. Additionally, when used in this application, the term "comprise" and its variations "comprises" and/or including and/or the like refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude 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 qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, reference may be made to the description of the method section for relevant parts.

Those skilled in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by 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. Skilled artisans may use different methods for implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the disclosed embodiments. The skilled person can clearly understand that, for the convenience and brevity of the description, for the specific working process of the system, control device and unit described above, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to apparatuses, devices, etc.) may be implemented in other ways. For example, the apparatus 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 omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection 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 components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. This embodiment may be implemented by selecting some or all of the units according to actual needs. 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 flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in special purpose hardware-based systems that perform the specified functions or actions, or special purpose hardware implemented in combination with computer instructions.

Claims (5)

1. A control method for defrosting an air conditioner is characterized by comprising the following steps:

acquiring the temperatures of two or more indoor coils when the air conditioner operates in a heating mode;

controlling the air conditioner to enter a defrosting mode according to the maximum value and the minimum value of the two or more indoor coil temperatures;

a maximum of the two or more indoor coil temperatures comprises: maximum indoor coil temperature t of current detection period _max And maximum indoor coil temperature T for all detection periods _max (ii) a The minimum of the two or more indoor coil temperatures comprises: minimum value t of indoor coil temperature of current detection period _min ；

The controlling the air conditioner to enter a defrosting mode according to the maximum value and the minimum value of the two or more indoor coil temperatures comprises:

when the first temperature difference delta T meets a first condition and the second temperature difference delta T meets a second condition, controlling the air conditioner to enter a defrosting mode; or,

when the first temperature difference DeltaT meets the first condition, the second temperature difference Deltat meets the second condition, and the indoor environment temperature T _room When a third condition is met, controlling the air conditioner to enter a defrosting mode;

wherein, T ═ T _max -t _max ；△t＝t _max -t _min ；

The first condition includes: delta T>T1, T1 is the first threshold; the second condition includes: delta t<T2, T2 is the second threshold; the third condition includes: t is t _roommax -t _room >T3, T3 is the third threshold, T _roommax Is the maximum value of the ambient temperature in the chamber in the current detection period, t _room Is the current indoor ambient temperature.

2. The control method of claim 1, wherein the two or more indoor coil temperatures comprise: the sensed indoor coil temperature over two or more sensing periods.

3. The control method according to claim 1 or 2, characterized by further comprising:

and after defrosting is finished, controlling the air conditioner to keep a standby or shutdown state for a set interval time, and re-entering the heating mode.

4. A control device for defrosting an air conditioner, comprising:

the first acquisition module is configured to acquire two or more indoor coil temperatures when the air conditioner operates in a heating mode;

a defrost control module configured to control the air conditioner to enter a defrost mode based on a maximum and a minimum of the two or more indoor coil temperatures;

a maximum of the two or more indoor coil temperatures comprises: maximum indoor coil temperature t of current detection period _max And maximum indoor coil temperature T for all detection periods _max (ii) a A minimum of the two or more indoor coil temperatures comprises: minimum value t of indoor coil temperature of current detection period _min ；

The controlling the air conditioner to enter a defrosting mode according to the maximum value and the minimum value of the two or more indoor coil temperatures comprises:

when the first temperature difference delta T meets a first condition and the second temperature difference delta T meets a second condition, controlling the air conditioner to enter a defrosting mode; or,

when the first temperature difference DeltaT meets a first condition, the second temperature difference Deltat meets a second condition, and the indoor environment temperature T _room When a third condition is met, controlling the air conditioner to enter a defrosting mode;

wherein, T ═ T _max -t _max ；△t＝t _max -t _min ；

The first condition includes: delta T>T1, T1 is the first threshold; the second condition includes: delta t<T2, T2 is the second threshold; the third condition includes: t is t _roommax -t _room >T3, T3 is the third threshold, T _roommax Is the maximum value of the ambient temperature in the chamber in the current detection period, t _room Is the current indoor ambient temperature.

5. An air conditioner characterized by comprising the control device according to claim 4.

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