CN110631183A

CN110631183A - Defrosting control method and device for air conditioner

Info

Publication number: CN110631183A
Application number: CN201810661294.0A
Authority: CN
Inventors: 许文明; 罗荣邦
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd
Priority date: 2018-06-25
Filing date: 2018-06-25
Publication date: 2019-12-31
Anticipated expiration: 2038-06-25
Also published as: CN110631183B

Abstract

The invention discloses a defrosting control method and device of an air conditioner, and belongs to the technical field of air conditioners. The control method comprises the following steps: acquiring the temperature of an inner coil pipe when an air conditioner operates, and determining a first temperature change rate of the temperature of the inner coil pipe; acquiring the indoor environment temperature when the air conditioner operates, and determining a second temperature change rate of the indoor environment temperature; and controlling the air conditioner to switch to the defrosting mode when the first temperature change rate of the temperature of the inner coil pipe is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold. The defrosting control method of the air conditioner can judge the frosting condition of the air conditioner according to the inner coil and the indoor environment temperature, so that the air conditioner can be controlled to defrost the outdoor unit in time; the judgment and control process of the defrosting control method does not depend on outdoor environment parameters, the defrosting process can be controlled only through the operation parameters of the indoor unit, and the intellectualization of air conditioner control is improved.

Description

Defrosting control method and device for air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device of an air conditioner.

Background

Along with the improvement of living standard of people, air conditioning equipment has also gone into thousands of households, the use of domestic air conditioners and central air conditioners is more and more common, the requirement of users on the comfort level of the air conditioners is more and more high, the problems existing in the use process of the air conditioners are also gradually exposed, and one of the problems is the problem that an outdoor unit of the air conditioner is frosted and frozen when the air conditioner operates in severe cold climate.

When the air conditioner operates in a low-temperature area or an area with large wind and snow, the condensed water flow on the outer surface of the condenser of the outdoor unit can drop on the base plate, the condenser and the base plate of the air conditioner can be frozen under the condition that the air conditioner operates for a long time, the condensed ice layer on the outdoor unit can obstruct the heat exchange between the internal refrigerant and the outdoor environment, the refrigerating efficiency of the air conditioner is reduced, in order to ensure the heating effect of the air conditioner, the air conditioner has to operate with increased power, and the extra consumption of electric energy and the use cost of a user are increased.

Therefore, some conventional air conditioners have a defrosting function to solve the problem of frost and ice formation of an outdoor unit of the air conditioner, for example, heating the outdoor unit by a heating device provided in the outdoor unit, or defrosting and melting ice in an outdoor heat exchanger by a refrigerant discharged from a compressor. An outdoor sensor is commonly matched with the air conditioner, and the outdoor sensor is used for detecting whether the outdoor environment temperature reaches the temperature condition of easily condensing frost or not so as to judge whether the defrosting function is started or not. This results in some fixed frequency air conditioners without outdoor sensors having no defrosting function; in the case of the inverter air conditioner, the outdoor sensor of the outdoor unit is also required to perform the defrosting function of the air conditioner, which also increases the manufacturing cost of the inverter air conditioner.

Disclosure of Invention

The invention provides a defrosting control method and device of an air conditioner, and aims to solve the problem that the conventional fixed-frequency or variable-frequency air conditioner can only operate a defrosting mode depending on detected outdoor environment parameters. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

According to a first aspect of the present invention, there is provided a defrosting control method of an air conditioner, the control method including:

acquiring the temperature of an inner coil pipe when an air conditioner operates, and determining a first temperature change rate of the temperature of the inner coil pipe;

acquiring the indoor environment temperature when the air conditioner operates, and determining a second temperature change rate of the indoor environment temperature;

and controlling the air conditioner to switch to the defrosting mode when the first temperature change rate of the temperature of the inner coil pipe is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold.

In an alternative embodiment, obtaining the temperature of the inner coil when the air conditioner is running and determining a first temperature change rate of the temperature of the inner coil comprises: sequentially detecting at least three inner coil temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two inner coil temperatures which are adjacent in sequence; calculating the difference between two temperature differences adjacent in sequence to obtain a first temperature change rate;

acquiring the indoor environment temperature when the air conditioner operates, and determining a second temperature change rate of the indoor environment temperature, wherein the method comprises the following steps: sequentially detecting at least three indoor environment temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two indoor environment temperatures which are adjacent in sequence; and calculating the difference between the two temperature differences adjacent in sequence to obtain a second temperature change rate.

In an alternative embodiment, the defrost control method further comprises:

acquiring the defrosting time of the previous defrosting mode;

and determining the set time interval according to the defrosting time length.

In an alternative embodiment, the defrost control method further comprises:

calculating a difference between the first rate of temperature change and a first rate threshold;

and determining the defrosting time length when the air conditioner executes the defrosting mode according to the difference between the first temperature change rate and the first speed threshold value.

In an alternative embodiment, the defrost control method further comprises:

acquiring the rotating speed of an inner fan when the air conditioner operates;

and determining a set first speed threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

According to a second aspect of the present invention, there is also provided a defrosting control apparatus of an air conditioner, the defrosting control apparatus including:

the first acquisition unit is used for acquiring the temperature of the inner coil pipe when the air conditioner operates and determining a first temperature change rate of the temperature of the inner coil pipe;

the second acquisition unit is used for acquiring the indoor environment temperature when the air conditioner operates and determining a second temperature change rate of the indoor environment temperature;

and the first control unit is used for controlling the air conditioner to be switched to the defrosting mode when the first temperature change rate of the temperature of the inner coil pipe is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold.

In an optional implementation manner, the first obtaining unit is specifically configured to: sequentially detecting at least three inner coil temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two inner coil temperatures which are adjacent in sequence; calculating the difference between two temperature differences adjacent in sequence to obtain a first temperature change rate;

the second obtaining unit is specifically configured to: sequentially detecting at least three indoor environment temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two indoor environment temperatures which are adjacent in sequence; and calculating the difference between the two temperature differences adjacent in sequence to obtain a second temperature change rate.

In an alternative embodiment, the defrost control apparatus further comprises:

the third acquisition unit is used for acquiring the defrosting time of the previous operation defrosting mode;

and the first determining unit is used for determining the set time interval according to the defrosting time length.

In an alternative embodiment, the defrost control apparatus further comprises:

a first calculation unit for calculating a difference between a first temperature change rate and a first rate threshold;

and the second determining unit is used for determining the defrosting time length when the air conditioner executes the defrosting mode according to the difference between the first temperature change rate and the first rate threshold value.

In an alternative embodiment, the defrost control apparatus further comprises:

the fourth acquisition unit is used for acquiring the rotating speed of the internal fan during the operation of the air conditioner;

and the third determining unit is used for determining a set first speed threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

The invention adopts the technical scheme and has the beneficial effects that:

the defrosting control method of the air conditioner can judge the frosting condition of the air conditioner according to the inner coil and the indoor environment temperature, so that the air conditioner can be controlled to defrost the outdoor unit in time when the frosting problem of the air conditioner is judged to possibly exist; the judgment and control process of the defrosting control method does not depend on outdoor environment parameters, the defrosting process can be controlled only through the operation parameters of the indoor unit, the intellectualization of air conditioner control is improved, and the extra production cost caused by the configuration of an outdoor sensor is avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a flowchart illustrating a defrost control method of an air conditioner according to an exemplary embodiment of the present invention;

fig. 2 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 3 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 4 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 5 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 6 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 7 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 8 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 9 is a flowchart illustrating a defrost control method of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 10 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner of the present invention according to an exemplary embodiment;

fig. 11 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 12 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 13 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 14 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 15 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 16 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 17 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment;

fig. 18 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to still another exemplary embodiment.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus 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, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.

The defrosting control method and the defrosting control device can be applied to a fixed-frequency type air conditioner without an outdoor sensor;

alternatively, it may be applied to an inverter type air conditioner having an outdoor sensor.

Here, the inverter type air conditioner may control the defrosting process according to the outdoor environment parameter collected by the outdoor sensor, or may defrost the outdoor unit of the air conditioner by applying the defrosting process defined by the defrosting control method provided by the present invention.

Fig. 1 is a flowchart illustrating a defrost control method of an air conditioner according to an exemplary embodiment of the present invention.

As shown in fig. 1, the present invention provides a defrosting control method for an air conditioner, the air conditioner itself has a defrosting mode capable of defrosting an outdoor unit, the defrosting mode is used to limit a defrosting process for the outdoor unit, for example, an optional defrosting mode is that the air conditioner is switched to a refrigerant flow direction same as a cooling mode, at this time, a high-temperature refrigerant discharged by a compressor first flows through an outdoor heat exchanger, and the heat of the high-temperature refrigerant is transferred outward to melt condensed frost and the like on the outdoor unit.

Specifically, the control flow of the defrosting control method provided by the invention comprises the following steps:

s101, acquiring the temperature of an inner coil pipe when an air conditioner operates, and determining the temperature change rate of the temperature of the inner coil pipe;

as an alternative embodiment, the coil position of the indoor heat exchanger of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used for detecting the real-time temperature of the coil position; in step S101, the real-time temperature of the coil position detected by the temperature sensor is used as the temperature of the inner coil of the current control process.

As an alternative embodiment, in step S101, in order to determine the temperature change rate of the inner coil temperature, at least three inner coil temperatures are sequentially detected at set time intervals, and the temperature difference between two inner coil temperatures that are adjacent in sequence is respectively calculated;

here, the time intervals are set to 1min, 2min, 5min, and so on.

Taking the set time interval as 1min as an example, detecting the temperature t0 of the inner coil pipe with the number 1 after the process is started; after 1min, detecting the temperature t1 of the inner coil pipe with the number 2 again; after another 1min interval, the inner coil temperature t2 of number 3 was detected.

Thus, the temperature difference between the two inner coil temperatures adjacent in sequence is calculated, wherein delta t1 is t1-t0, and delta t2 is t2-t 1;

further, the difference between the two temperature differences adjacent in order is calculated, and the temperature change rate is obtained as (Δ t2- Δ t 1).

And S102, controlling the air conditioner to be switched to a defrosting mode when the temperature change rate of the temperature of the inner coil is larger than a set rate threshold value.

Here, the set speed threshold is a temperature threshold for representing whether the air conditioner outdoor unit has a frosting problem; when the temperature change rate of the temperature of the inner coil pipe is greater than the set rate threshold value, the temperature of the inner coil pipe is indicated to be decreased faster at the moment, and then the frosting amount of the outdoor unit is more and the frosting rate is faster, and at the moment, the air conditioner needs to defrost the outdoor unit; when the temperature change rate of the temperature of the inner coil is smaller than or equal to the set rate threshold, the rate of temperature reduction of the inner coil is relatively slow at the moment, and then the frosting amount of the outdoor unit is relatively small and the frosting rate is relatively slow, and at the moment, the air conditioner does not need to defrost the outdoor unit temporarily.

Therefore, in step S102, the current frosting condition of the outdoor unit is controlled and further determined by comparing the temperature change rate of the temperature of the inner coil with the set rate threshold, so as to further determine whether the air conditioner needs to be switched to the defrosting mode.

In this example, the rate threshold is set at 1 ℃.

As an alternative embodiment, the defrost control method further comprises: acquiring the defrosting time of the previous defrosting mode; and determining the set time interval according to the defrosting time length.

In this embodiment, the air conditioner further includes a timing module, and the timing module is configured to measure and store a defrosting duration of a defrosting procedure defined by each defrosting mode when the air conditioner switches to the defrosting mode.

Here, the time length values of the defrosting time lengths of the defrosting processes defined by each defrosting mode are different.

Therefore, when the air conditioner executes the current control flow, the defrosting duration of the previous defrosting flow recorded by the timing module can be called, so that the set time interval can be determined according to the defrosting duration.

In this embodiment, the defrosting time duration is in a direct proportion to the set time interval, that is, the longer the defrosting time duration of the previous defrosting mode, the longer the duration of the previous defrosting process of the air conditioner is, the better the defrosting effect is, the less the influence of the outdoor unit defrosting again in a short time on the temperature of the inner coil of the indoor unit is, so the set time interval is set to a longer time duration value; the shorter the defrosting time of the previous defrosting mode, the shorter the duration of the previous defrosting process of the air conditioner is, the limited defrosting effect is achieved, and the influence of the outdoor unit defrosting again in a short time on the temperature of the inner coil of the indoor unit is larger, so the set time interval is set to be a shorter time value.

For example, if the defrosting time of the previous defrosting process is 10min, the set time interval for detecting the temperature of the inner coil in the current control process is 1 min; the defrosting time of the previous defrosting process is 15min, and the set time interval for detecting the temperature of the inner coil in the current control process is 2 min; the defrosting time of the previous defrosting process is 20min, and the set time interval for detecting the temperature of the inner coil in the current control process is 5 min; and so on.

As an optional embodiment, before switching to the defrost mode, the defrost control method further comprises: calculating a difference between the rate of temperature change and a rate threshold; and determining the defrosting time length when the air conditioner executes the defrosting mode according to the difference between the temperature change rate and the rate threshold value. And the determined defrosting time is the defrosting time for executing the current defrosting process.

Here, the difference between the temperature change rate and the rate threshold value is (Δ t2- Δ t1) -1, where the temperature change rate is (Δ t2- Δ t1) and the rate threshold value is 1 ℃.

The larger the value of the difference between the temperature change rate and the rate threshold value is, the more serious the current frosting degree is, the longer the defrosting time duration when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time duration to defrost the outdoor unit, thereby ensuring the defrosting effect. The smaller the value of the difference between the temperature change rate and the rate threshold value is, the lighter the current frosting degree is, the shorter the defrosting time length of the air conditioner in the defrosting mode is, so that the disturbance influence of the defrosting mode of the air conditioner operation on the air conditioner to maintain the indoor environment temperature can be reduced under the condition of not influencing the defrosting effect.

For example, when the difference between the temperature change rate and the rate threshold is less than or equal to 2 ℃, the defrosting time of the current defrosting process is 10 min; when the difference between the temperature change rate and the rate threshold is greater than 2 ℃ and less than or equal to 5 ℃, the defrosting time of the current defrosting process is 15 min; when the difference between the temperature change rate and the rate threshold is more than 5 ℃, the defrosting time of the current defrosting process is 25 min; and so on.

As an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe also can be influenced, and the change rate of the temperature of the internal coil pipe can be directly influenced, so that the calculation accuracy of the defrosting process is improved, and the error influence caused by the operation of the internal fan is reduced; the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set speed threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner may have a pre-stored correlation between a set wind speed gear range and a set speed threshold, which may also be measured through an experiment before the air conditioner leaves a factory, and for example, the correlation between the two may include: setting a speed threshold value to be 5min when the wind speed gear range is a high wind gear; setting a speed threshold value to be 2min when the wind speed gear range is a wind stroke gear; setting a speed threshold value to be 1min when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the speed threshold value are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is proved, and under the condition of the same change rate of the temperature of the inner coil, the specific gravity of the temperature influence of the outdoor environment on the inner coil is relatively reduced (namely, the frosting degree is not serious or light), so that the speed threshold value corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the inner coil is proved to be, and under the condition of the same change rate of the temperature of the inner coil, the proportion of the influence of the outdoor environment on the temperature of the inner coil is relatively increased (namely, the frosting degree is serious), so that the speed threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

Fig. 2 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 2, the present invention provides another defrosting control method for an air conditioner, and the control flow of the control method may include:

s201, acquiring the temperature of an inner coil and the indoor environment temperature when an air conditioner operates;

as an alternative embodiment, the coil position of the indoor heat exchanger of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used for detecting the real-time temperature of the coil position; in step S201, the real-time temperature of the coil position detected by the temperature sensor is used as the temperature of the inner coil of the current control process.

Similarly, the air conditioner is also provided with another temperature sensor which can be used for detecting the real-time temperature of the indoor environment where the air conditioner is located; in step S201, the implementation temperature of the indoor environment detected by the temperature sensor is used as the indoor environment temperature of the current control flow.

S202, when the temperature of the inner coil is smaller than a set first temperature threshold and the temperature of the indoor environment is smaller than a set second temperature threshold, controlling the air conditioner to switch to a defrosting mode.

In this embodiment, the first temperature threshold and the second temperature threshold are temperature thresholds used for representing whether the air conditioner outdoor unit has a frosting problem; when the temperature of the inner coil pipe is smaller than a set first temperature threshold and the indoor environment temperature is smaller than a set second temperature threshold, the temperature of the inner coil pipe is fast in descending, and then the frosting amount and the frosting speed of the outdoor unit can be judged to be fast, and at the moment, the air conditioner needs to defrost the outdoor unit; when the temperature of the inner coil is not less than the set first temperature threshold and/or the indoor environment temperature is not less than the set second temperature threshold, the speed of the temperature drop of the inner coil is slow, and then the frosting amount of the outdoor unit is less and the frosting speed is slow, and at this time, the air conditioner does not need to defrost the outdoor unit temporarily.

Therefore, in step S202, the current frosting condition of the outdoor unit is determined by comparing the values of the temperature of the internal coil with the first temperature threshold and the indoor environment temperature with the second temperature threshold, so as to further determine whether the air conditioner needs to be switched to the defrosting mode.

As an alternative embodiment, before controlling the air conditioner to switch to the defrosting mode, the defrosting control method further includes: calculating the difference between the temperature of the inner coil and a first temperature threshold; and determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference value between the temperature of the inner coil and the first temperature threshold value.

For example, if the inner coil temperature is tcoil and the first temperature threshold is t1, the difference between the inner coil temperature and the first temperature threshold is tcoil-t 1; and determining the defrosting time of the defrosting mode of the air conditioner operation according to the difference.

In this embodiment, the difference between the temperature of the inner coil and the first temperature threshold is proportional to the defrosting time period. The larger the difference between the temperature of the inner coil and the first temperature threshold is, the more serious the current frosting degree is, the longer the defrosting time when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time to defrost the outdoor unit, and the defrosting effect is ensured. The smaller the difference between the temperature of the inner coil and the first temperature threshold value is, the lighter the current frosting degree is, the shorter the defrosting time length of the air conditioner in the defrosting mode is, so that the disturbance influence of the defrosting mode of the air conditioner on the indoor environment temperature maintenance of the air conditioner can be reduced under the condition of not influencing the defrosting effect.

For example, when the difference between the temperature of the inner coil and the first temperature threshold is less than or equal to 1 ℃, the defrosting time of the current defrosting process is 7 min; when the difference value between the temperature of the inner coil and the first temperature threshold is more than 1 ℃ and less than or equal to 3 ℃, the defrosting time of the current defrosting process is 12 min; when the difference value between the temperature of the inner coil and the first temperature threshold is more than 3 ℃, the defrosting time of the current defrosting process is 20 min; and so on.

As another alternative embodiment, before controlling the air conditioner to switch to the defrosting mode, the defrosting control method further includes: calculating the difference value between the indoor environment temperature and the second temperature threshold value; and determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference value between the indoor environment temperature and the second temperature threshold value.

For example, if the indoor ambient temperature is te, the second temperature threshold is t2, and the difference between the temperature of the inner coil and the first temperature threshold is te-t 2; and determining the defrosting time of the defrosting mode of the air conditioner operation according to the difference.

In this embodiment, the difference between the indoor ambient temperature and the second temperature threshold is in direct proportion to the defrosting time period. The larger the difference between the indoor environment temperature and the second temperature threshold is, the more serious the current frosting degree is, the longer the defrosting time duration when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time duration to defrost the outdoor unit, and the defrosting effect is ensured. The smaller the difference between the indoor environment temperature and the second temperature threshold value is, the lighter the current frosting degree is, the shorter the defrosting time length of the air conditioner in the defrosting mode is, so that the disturbance influence of the defrosting mode of the air conditioner operation on the indoor environment temperature maintenance of the air conditioner can be reduced under the condition that the defrosting effect is not influenced.

For example, when the difference between the indoor environment temperature and the second temperature threshold is less than or equal to 2 ℃, the defrosting time of the current defrosting process is 10 min; when the difference value between the indoor environment temperature and the second temperature threshold is greater than 2 ℃ and less than or equal to 5 ℃, the defrosting time of the current defrosting process is 15 min; when the difference value between the indoor environment temperature and the second temperature threshold is more than 5 ℃, the defrosting time of the current defrosting process is 18 min; and so on.

As an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe also can be influenced, and the change rate of the temperature of the internal coil pipe can be directly influenced, so that the calculation accuracy of the defrosting process is improved, and the error influence caused by the operation of the internal fan is reduced; the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set first temperature threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner may have a pre-stored correlation between a set wind speed gear range and a set first temperature threshold, which may also be measured through experiments before the air conditioner leaves a factory, and for example, the correlation between the two may include: setting a first temperature threshold value as 5min when the wind speed gear range is a high wind gear; when the wind speed gear range is set as a wind stroke gear, the first temperature threshold value is 2 min; setting a first temperature threshold value to be 1min when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the first temperature threshold are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is, and under the condition of the same change rate of the temperature of the inner coil, the specific gravity of the temperature influence of the outdoor environment on the inner coil is relatively reduced (that is, the frosting degree is not serious or light), so that the first temperature threshold corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the inner coil is proved to be, and under the condition of the same change rate of the temperature of the inner coil, the proportion of the influence of the outdoor environment on the temperature of the inner coil is relatively increased (namely, the frosting degree is serious), so that the first temperature threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

As a further alternative embodiment, similarly, the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set second temperature threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner may have a pre-stored correlation between the set wind speed gear range and the set second temperature threshold, which may also be measured through an experiment before the air conditioner leaves the factory, and for example, the correlation between the two may include: setting a second temperature threshold value as 5 ℃ when the wind speed gear range is a high wind gear; setting a second temperature threshold value to be 2 ℃ when the wind speed gear range is a wind stroke gear; setting a second temperature threshold value as 1 ℃ when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the second temperature threshold are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the indoor environment is proved to be, and under the condition of the same change rate of the indoor environment temperature, the proportion of the influence of the outdoor environment on the temperature of the indoor environment is relatively reduced (that is, the frosting degree is not serious or light), so that the second temperature threshold corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the indoor environment is proved to be, and under the condition of the same change rate of the indoor environment temperature, the proportion of the influence of the outdoor environment on the temperature of the indoor environment is relatively increased (namely, the frosting degree is serious), so that the second temperature threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

Fig. 3 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 3, the present invention provides another defrosting control method for an air conditioner, and the control flow of the defrosting control method may include:

s301, acquiring the temperature of an inner coil and the indoor environment temperature when the air conditioner operates;

in this embodiment, the specific implementation manner of step S301 may refer to step S201 of the previous embodiment, which is not described herein again.

S302, when the temperature of the inner coil is smaller than a set temperature threshold value and the difference value between the set room temperature and the indoor environment temperature is larger than a set temperature difference threshold value, controlling the air conditioner to switch to a defrosting mode.

In this embodiment, the temperature threshold and the temperature difference threshold are temperature thresholds used for representing whether the air conditioner outdoor unit has a frosting problem; when the temperature of the inner coil pipe is smaller than a set temperature threshold value and the difference value between the set room temperature and the indoor environment temperature is larger than a set temperature difference threshold value, the temperature of the inner coil pipe is fast in descending, and then the frosting amount and the frosting speed of the outdoor unit can be judged to be high, and at the moment, the air conditioner needs to defrost the outdoor unit; when the temperature of the inner coil is not less than the set temperature threshold and/or the difference between the set room temperature and the indoor environment temperature is not greater than the set temperature difference threshold, the speed of the temperature drop of the inner coil is relatively slow, and then the frosting amount of the outdoor unit is relatively small and the frosting speed is relatively slow, and at the moment, the air conditioner does not need to defrost the outdoor unit temporarily.

Here, the room temperature is set to an indoor temperature that the user desires to reach, which is set by the user through an input device such as a remote controller or a control panel, for example, a target heating temperature in the heating mode.

Therefore, in step S302, the difference between the temperature of the inner coil and the temperature threshold, the difference between the set room temperature and the indoor environment temperature, and the set temperature difference threshold are respectively compared to control and further determine the current frosting condition of the outdoor unit, so as to further determine whether the air conditioner needs to be switched to the defrosting mode.

As an alternative embodiment, before controlling the air conditioner to switch to the defrosting mode, the defrosting control method further includes: calculating the difference value between the temperature of the inner coil and the temperature threshold value; and determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the temperature of the inner coil and the temperature threshold value.

For example, if the temperature of the inner coil is tcoil and the temperature threshold is t1, the difference between the temperature of the inner coil and the temperature threshold is tcoil-t 1; and determining the defrosting time of the defrosting mode of the air conditioner operation according to the difference.

In this embodiment, the difference between the temperature of the inner coil and the temperature threshold is directly proportional to the defrosting time. The larger the difference between the temperature of the inner coil and the temperature threshold value is, the more serious the current frosting degree is, the longer the defrosting time when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time to defrost the outdoor unit, and the defrosting effect is ensured. The smaller the difference between the temperature of the inner coil and the temperature threshold value is, the lighter the current frosting degree is, the shorter the defrosting time length of the air conditioner in the defrosting mode is, so that the disturbance influence of the defrosting mode of the air conditioner on the indoor environment temperature maintenance of the air conditioner can be reduced under the condition of not influencing the defrosting effect.

For example, when the difference between the temperature of the inner coil and the temperature threshold is less than or equal to 1 ℃, the defrosting time of the current defrosting process is 7 min; when the difference value between the temperature of the inner coil and the temperature threshold is more than 1 ℃ and less than or equal to 3 ℃, the defrosting time of the current defrosting process is 12 min; when the difference value between the temperature of the inner coil and the temperature threshold is more than 3 ℃, the defrosting time of the current defrosting process is 20 min; and so on.

As another alternative embodiment, before controlling the air conditioner to switch to the defrosting mode, the defrosting control method further includes: and determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the set room temperature and the indoor environment temperature.

For example, if the indoor environment temperature is te and the room temperature is tp, the difference between the room temperature and the indoor environment temperature is tp-te; and determining the defrosting time of the defrosting mode of the air conditioner operation according to the difference.

In this embodiment, a proportional relationship is set between the difference between the room temperature and the indoor ambient temperature and the defrosting time. The larger the difference between the set room temperature and the indoor environment temperature is, the more serious the current frosting degree is, the longer the defrosting time length when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time length to defrost the outdoor unit, and the defrosting effect is ensured. The smaller the difference between the set room temperature and the indoor environment temperature is, the lighter the current frosting degree is, the shorter the defrosting time duration when the air conditioner executes the defrosting mode is, so that the disturbance influence of the defrosting mode of the air conditioner operation on the indoor environment temperature maintenance of the air conditioner can be reduced under the condition of not influencing the defrosting effect.

For example, when the difference between the room temperature and the indoor environment temperature is set to be less than or equal to 3 ℃, the defrosting time of the current defrosting process is set to be 5 min; setting the defrosting time of the current defrosting process to be 10min when the difference value between the room temperature and the indoor environment temperature is more than 3 ℃ and less than or equal to 8 ℃; setting the defrosting time of the current defrosting process to be 15min when the difference value between the room temperature and the indoor environment temperature is more than 8 ℃; and so on.

As an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe also can be influenced, and the change rate of the temperature of the internal coil pipe can be directly influenced, so that the calculation accuracy of the defrosting process is improved, and the error influence caused by the operation of the internal fan is reduced; the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set temperature threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner may have a pre-stored correlation between a set wind speed gear range and a set temperature threshold, which may also be measured through an experiment before the air conditioner leaves a factory, and for example, the correlation between the two may include: setting a temperature threshold value to be 5min when the wind speed gear range is a high wind gear; setting a temperature threshold value to be 2min when the wind speed gear range is a wind stroke gear; setting a temperature threshold value to be 1min when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the temperature threshold value are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is proved, and under the condition of the same change rate of the temperature of the inner coil, the specific gravity of the influence of the outdoor environment on the temperature of the inner coil is relatively reduced (namely, the frosting degree is not serious or light), so that the temperature threshold value corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the inner coil is proved to be, and under the condition of the same change rate of the temperature of the inner coil, the proportion of the influence of the outdoor environment on the temperature of the inner coil is relatively increased (namely, the frosting degree is serious), so that the temperature threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

As a further alternative embodiment, similarly, the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set temperature difference threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner prestores a correlation between a set wind speed gear range and a set temperature difference threshold, which may also be measured through an experiment before the air conditioner leaves a factory, and for example, the correlation between the two may include: setting a temperature difference threshold value as 5 ℃ when the wind speed gear range is a high wind gear; setting a temperature difference threshold value to be 2 ℃ when the wind speed gear range is a wind stroke gear; setting a temperature difference threshold value as 1 ℃ when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the temperature difference threshold value are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the indoor environment is proved to be, the smaller the proportion of the influence of the outdoor environment on the temperature of the indoor environment is relatively reduced (that is, the frosting degree is not serious or light), and therefore, the temperature difference threshold value corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the indoor environment is proved to be, the relatively increased specific gravity (namely, the severe frosting degree) of the temperature influence of the outdoor environment on the indoor environment is proved to be, so that the temperature difference threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

Fig. 4 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 4, the present invention provides another defrosting control method for an air conditioner, and the control flow of the defrosting control method may include:

s401, acquiring the temperature of an inner coil pipe and the indoor environment temperature when the air conditioner operates;

in this embodiment, the specific implementation manner of step S401 may refer to step S201 of the previous embodiment, which is not described herein again.

S402, determining the temperature change rate of the temperature of the inner coil;

in this embodiment, the specific implementation manner of step S402 may refer to step S101 of the previous embodiment, which is not described herein again.

And S403, controlling the air conditioner to switch to the defrosting mode when the temperature change rate of the temperature of the inner coil is greater than the set rate threshold and the indoor environment temperature is less than the set temperature threshold.

In this embodiment, the speed threshold and the temperature threshold are temperature thresholds used for representing whether the air conditioner outdoor unit has a frosting problem; when the temperature change rate of the temperature of the inner coil pipe is greater than the set rate threshold value and the indoor environment temperature is less than the set temperature threshold value, the temperature of the inner coil pipe is indicated to be decreased faster at the moment, and then the frosting amount of the outdoor unit is more and the frosting rate is faster, and at the moment, the air conditioner needs to defrost the outdoor unit; and when the temperature change rate of the temperature of the inner coil is not more than the set rate threshold and/or the indoor environment temperature is not less than the set temperature threshold, the rate of temperature reduction of the inner coil is relatively slow, so that the frosting amount of the outdoor unit is relatively small, the frosting rate is relatively slow, and at the moment, the air conditioner does not need to defrost the outdoor unit temporarily.

Therefore, in step S403, the current frosting condition of the outdoor unit is determined by comparing the temperature change rate of the temperature of the inner coil with the set rate threshold and comparing the indoor environment temperature with the set temperature threshold, so as to further determine whether the air conditioner needs to be switched to the defrosting mode.

As an optional embodiment, before switching to the defrost mode, the defrost control method further comprises: calculating the difference value between the temperature change rate of the temperature of the inner coil and a set rate threshold value; and determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference value between the temperature change rate of the temperature of the inner coil and the set rate threshold value. And the determined defrosting time is the defrosting time for executing the current defrosting process.

Here, the difference between the temperature change rate and the rate threshold is (Δ t2- Δ t1) -1, where the temperature change rate is (Δ t2- Δ t1) and the rate threshold is 1 ℃.

As another alternative embodiment, before controlling the air conditioner to switch to the defrosting mode, the defrosting control method further includes: calculating the difference value between the indoor environment temperature and the temperature threshold value; and determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the indoor environment temperature and the temperature threshold value.

For example, if the indoor ambient temperature is te and the temperature threshold is t2, the difference between the temperature of the inner coil and the first temperature threshold is te-t 2; and determining the defrosting time of the defrosting mode of the air conditioner operation according to the difference.

In this embodiment, the difference between the indoor ambient temperature and the temperature threshold is in direct proportion to the defrosting time. The larger the difference between the indoor environment temperature and the temperature threshold value is, the more serious the current frosting degree is, the longer the defrosting time length when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time length to defrost the outdoor unit, and the defrosting effect is ensured. The smaller the difference between the indoor environment temperature and the temperature threshold value is, the lighter the current frosting degree is, the shorter the defrosting time length of the air conditioner in the defrosting mode is, so that the disturbance influence of the defrosting mode of the air conditioner on the indoor environment temperature maintenance of the air conditioner can be reduced under the condition of not influencing the defrosting effect.

For example, when the difference between the indoor environment temperature and the temperature threshold is less than or equal to 2 ℃, the defrosting time of the current defrosting process is 10 min; when the difference value between the indoor environment temperature and the temperature threshold is more than 2 ℃ and less than or equal to 5 ℃, the defrosting time of the current defrosting process is 15 min; when the difference value between the indoor environment temperature and the temperature threshold value is more than 5 ℃, the defrosting time of the current defrosting process is 18 min; and so on.

As still another optional embodiment, the defrost control method further comprises: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set temperature threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

Fig. 5 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 5, the present invention provides another defrosting control method for an air conditioner, and the control flow of the control method may include:

s501, acquiring the temperature of an inner coil and the indoor environment temperature when the air conditioner operates;

in this embodiment, the specific implementation manner of step S501 may refer to step S201 of the previous embodiment, which is not described herein again.

S502, determining the temperature change rate of the temperature of the inner coil;

in this embodiment, the specific implementation manner of step S502 may refer to step S101 of the previous embodiment, which is not described herein again.

S503, when the temperature change rate of the temperature of the inner coil is larger than a set rate threshold value and the difference value between the set room temperature and the indoor environment temperature is larger than a set temperature difference threshold value, controlling the air conditioner to switch to the defrosting mode.

In this embodiment, the calculation manner of the difference between the set room temperature and the indoor environment temperature may refer to step S302.

In this embodiment, the speed threshold and the temperature difference threshold are temperature thresholds used for representing whether the air conditioner outdoor unit has a frosting problem; when the temperature change rate of the temperature of the inner coil pipe is smaller than a set rate threshold value and the difference value between the set room temperature and the indoor environment temperature is larger than a set temperature difference threshold value, the temperature of the inner coil pipe is indicated to be reduced faster at the moment, and then the frosting amount and the frosting rate of the outdoor unit can be judged to be higher, and at the moment, the air conditioner needs to defrost the outdoor unit; when the temperature change rate of the temperature of the inner coil is not less than the set temperature threshold and/or the difference between the set room temperature and the indoor environment temperature is not more than the set temperature difference threshold, the rate of temperature reduction of the inner coil is relatively low, and then the frosting amount of the outdoor unit is relatively low and the frosting rate is relatively low can be judged, and at the moment, the air conditioner does not need to defrost the outdoor unit temporarily.

Therefore, in step S503, the current frosting condition of the outdoor unit is controlled and further determined by comparing the temperature change rate of the temperature of the inner coil with the rate threshold, the difference between the set room temperature and the indoor environment temperature, and the set temperature difference threshold, so as to further determine whether the air conditioner needs to be switched to the defrosting mode.

As an optional embodiment, before switching to the defrost mode, the defrost control method further comprises: calculating the difference value between the temperature change rate of the temperature of the inner coil and a set rate threshold value; and determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference value between the temperature change rate of the temperature of the inner coil and the set rate threshold value.

Fig. 6 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 6, the present invention provides another defrosting control method for an air conditioner, and the control flow of the control method may include:

s601, acquiring the indoor environment temperature when the air conditioner operates, and determining the temperature change rate of the indoor environment temperature;

as an alternative embodiment, the indoor unit of the air conditioner is provided with a temperature sensor, which can be used to detect the real-time temperature of the indoor environment; in step S601, the real-time temperature of the indoor environment detected by the temperature sensor is used as the indoor environment temperature of the current control flow.

As an alternative embodiment, in step S601, in order to determine the temperature change rate of the indoor environment temperature, at least three indoor environment temperatures are sequentially detected at set time intervals, and the temperature difference between two indoor environment temperatures adjacent in sequence is respectively calculated;

here, the time intervals are set to 1min, 2min, 5min, and so on.

Taking the set time interval as 1min as an example, after the flow starts, detecting to obtain the indoor environment temperature t0 with the number 1; after the interval of 1min, detecting again to obtain the indoor environment temperature t1 with the number 2; after another 1min interval, the indoor ambient temperature t2 of number 3 is detected.

Thus, the temperature difference between two indoor ambient temperatures adjacent in sequence is calculated, Δ t1-t 1-t0, Δ t2-t 2-t 1;

And S602, when the temperature change rate of the indoor environment temperature is greater than a set rate threshold value, controlling the air conditioner to switch to a defrosting mode.

Here, the set speed threshold is a temperature threshold for representing whether the air conditioner outdoor unit has a frosting problem; when the temperature change rate of the indoor environment temperature is greater than the set rate threshold, the speed of the drop of the indoor environment temperature is high, and further the frosting amount of the outdoor unit is large and the frosting rate is high, and at the moment, the air conditioner needs to defrost the outdoor unit; when the temperature change rate of the indoor environment temperature is smaller than or equal to the set rate threshold, the rate of the drop of the indoor environment temperature is slow, and then the frosting amount of the outdoor unit is less and the frosting rate is slow, and at this time, the air conditioner does not need to defrost the outdoor unit temporarily.

Therefore, in step S602, the current frosting condition of the outdoor unit is determined by comparing the temperature change rate of the indoor environment temperature with the set rate threshold, so as to further determine whether the air conditioner needs to be switched to the defrosting mode.

In this example, the rate threshold is set at 1 ℃.

In this embodiment, the defrosting time duration is in a direct proportion to the set time interval, that is, the longer the defrosting time duration of the previous defrosting mode, the longer the duration of the previous defrosting process of the air conditioner is, the better the defrosting effect is, the less the influence of the outdoor unit defrosting again in a short time on the indoor environment temperature of the indoor unit is, so the set time interval is set to a longer time duration value; the shorter the defrosting time of the previous defrosting mode, the shorter the duration of the previous defrosting process of the air conditioner is, the limited defrosting effect is obtained, and the influence of the outdoor unit frosting again in a short time on the indoor environment temperature of the indoor unit is larger, so the set time interval is set to be a shorter time value.

For example, if the defrosting time of the previous defrosting process is 10min, the set time interval for detecting the indoor environment temperature of the current control process is 1 min; the defrosting time of the previous defrosting process is 15min, and the set time interval for detecting the indoor environment temperature of the current control process is 2 min; the defrosting time of the previous defrosting process is 20min, and the set time interval for detecting the indoor environment temperature of the current control process is 5 min; and so on.

As an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe also can be influenced, and the change rate of the indoor environment temperature can be directly influenced, so that the calculation accuracy of the defrosting process is improved, and the error influence caused by the operation of the internal fan is reduced; the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set speed threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner may have a pre-stored correlation between a set wind speed gear range and a set speed threshold, which may also be measured through an experiment before the air conditioner leaves a factory, and for example, the correlation between the two may include: setting a speed threshold value to be 5min when the wind speed gear range is a high wind gear; setting a speed threshold value to be 2min when the wind speed gear range is a wind stroke gear; setting a speed threshold value to be 1min when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the rate threshold are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the indoor environment is proved to be, and under the condition of the same change rate of the indoor environment temperature, the proportion of the influence of the outdoor environment on the temperature of the indoor environment is relatively reduced (that is, the frosting degree is not serious or light), so that the rate threshold corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the indoor environment is proved to be, and under the condition of the same change rate of the indoor environment temperature, the proportion of the influence of the outdoor environment on the temperature of the indoor environment is relatively increased (namely, the frosting degree is serious), so that the speed threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

Fig. 7 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 7, the present invention provides a defrosting control method for an air conditioner, wherein the control flow of the defrosting control method may include:

s701, acquiring the indoor environment temperature when the air conditioner operates;

in this embodiment, as an optional embodiment, the indoor unit of the air conditioner is provided with a temperature sensor, and the temperature sensor can be used for detecting the real-time temperature of the indoor environment; in step S701, the real-time temperature of the indoor environment detected by the temperature sensor is used as the indoor environment temperature of the current control flow.

As an alternative embodiment, the indoor ambient temperature obtained in step S701 is a single value. Alternatively, the first and second electrodes may be,

as another alternative embodiment, in step S701, in order to determine the temperature change rate of the indoor environment temperature, at least three indoor environment temperatures are sequentially detected at set time intervals, and the temperature difference between two indoor environment temperatures adjacent in sequence is respectively calculated;

here, the time intervals are set to 1min, 2min, 5min, and so on.

And S702, controlling the air conditioner to switch to a defrosting mode when the difference value between the set room temperature and the indoor environment temperature is greater than the set temperature difference threshold value.

Respectively calculating to obtain the difference value between each set room temperature and the indoor environment temperature; and when the difference value between all the set room temperature and the indoor environment temperature is greater than the set temperature difference threshold value, controlling the air conditioner to switch to the defrosting mode.

For example, setting the room temperature to tp, and setting the indoor environment temperature to include t0, t1 and t2 respectively, and setting the difference values of the room temperature and the indoor environment temperature to tp-t0, tp-t1 and tp-t2 respectively; and when the tp-t0, the tp-t1 and the tp-t2 are all larger than the set temperature difference threshold value, controlling the air conditioner to switch to the defrosting mode.

In this embodiment, the defrosting time duration is in a direct proportion to the set time interval, that is, the longer the defrosting time duration of the previous defrosting mode, the longer the duration of the previous defrosting process of the air conditioner is, the better the defrosting effect is, the less the influence of the outdoor unit defrosting again in a short time on the indoor environment temperature is, so the set time interval is set to a longer time duration value; the shorter the defrosting time of the previous defrosting mode, the shorter the duration of the previous defrosting process of the air conditioner is, the defrosting effect is limited, and the influence of the outdoor unit defrosting again in a short time on the indoor environment temperature is larger, so the set time interval is set to be a shorter time length value.

As an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe also can be influenced, and the change rate of the temperature of the internal coil pipe can be directly influenced, so that the calculation accuracy of the defrosting process is improved, and the error influence caused by the operation of the internal fan is reduced; the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set temperature difference threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

Fig. 8 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 8, the present invention provides a defrosting control method for an air conditioner, wherein the control flow of the defrosting control method may include:

s801, acquiring the temperature of an inner coil pipe during the operation of the air conditioner, and determining a first temperature change rate of the temperature of the inner coil pipe;

in this embodiment, the specific implementation manner of step S801 may refer to step S101 of the previous embodiment, which is not described herein again.

S802, acquiring the indoor environment temperature when the air conditioner operates, and determining a second temperature change rate of the indoor environment temperature;

in this embodiment, the specific implementation manner of step S802 may refer to step S601 in the previous embodiment, which is not described herein again.

Here, step S801 and step S802 are synchronization detection.

And S803, controlling the air conditioner to switch to the defrosting mode when the first temperature change rate of the temperature of the inner coil is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold.

Here, the first rate threshold and the second rate threshold are set as temperature thresholds for representing whether the outdoor unit of the air conditioner has a frosting problem; when the first temperature change rate of the temperature of the inner coil pipe is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold, the temperature of the inner coil pipe and the indoor environment temperature are decreased faster at the moment, and then the frosting amount of the outdoor unit is more and the frosting rate is faster, and at the moment, the air conditioner needs to defrost the outdoor unit; when the first temperature change rate of the temperature of the inner coil is not greater than the set first rate threshold and/or the temperature change rate of the indoor environment temperature is not greater than the set second rate threshold, it is indicated that the rate of the temperature decrease of the inner coil and the indoor environment temperature is slower at the moment, and then it can be judged that the frosting amount of the outdoor unit is less and the frosting rate is also slower, and at the moment, the air conditioner does not need to defrost the outdoor unit temporarily.

Therefore, in step S803, the first temperature change rate of the temperature of the inner coil is compared with the set first rate threshold, and the temperature change rate of the indoor environment temperature is compared with the set second rate threshold, so as to control and further determine the current frosting condition of the outdoor unit, thereby further determining whether the air conditioner needs to be switched to the defrosting mode.

In this embodiment, the first rate threshold is set to 1 ℃ and the second rate threshold is set to 2 ℃.

As an alternative embodiment, the defrost control method further comprises: acquiring the defrosting time of the previous defrosting mode; and determining the set time interval according to the defrosting time length. The set time interval is a time interval in the process of detecting the temperature of the inner coil and the indoor ambient temperature.

In this embodiment, the defrosting time duration is in a direct proportion to the set time interval, that is, the longer the defrosting time duration of the previous defrosting mode, the longer the duration of the previous defrosting process of the air conditioner is, the better the defrosting effect is, the less the influence of the defrosting of the indoor unit on the temperature of the inner coil of the indoor unit and the temperature of the indoor environment is, and therefore, the set time interval is set to a longer time duration value; the shorter the defrosting time of the previous defrosting mode, the shorter the duration of the previous defrosting process of the air conditioner is, the defrosting effect is limited, and the influence of the frosting of the indoor unit again on the temperature of the inner coil of the indoor unit and the temperature of the indoor environment is larger in a short time, so that the set time interval is set to be a shorter time value.

For example, if the defrosting time of the previous defrosting process is 10min, the set time interval for synchronously detecting the temperature of the inner coil and the indoor environment temperature in the current control process is 1 min; the defrosting time of the previous defrosting process is 15min, and the set time interval for synchronously detecting the temperature of the inner coil and the indoor environment temperature of the current control process is 2 min; the defrosting time of the previous defrosting process is 20min, and the set time interval for synchronously detecting the temperature of the inner coil and the indoor environment temperature of the current control process is 5 min; and so on.

As an optional embodiment, before switching to the defrost mode, the defrost control method further comprises: calculating a difference between the first rate of temperature change and a first rate threshold; and determining the defrosting time length when the air conditioner executes the defrosting mode according to the difference between the first temperature change rate and the first speed threshold value.

Here, the difference between the first temperature change rate and the first rate threshold value is ([ delta ] t2- [ delta ] t1) -1, where the first temperature change rate is ([ delta ] t2- [ delta ] t1) and the first rate threshold value is 1 ℃.

The larger the difference value between the first temperature change rate and the first rate threshold value is, the more serious the current frosting degree is, the longer the defrosting time duration when the air conditioner executes the defrosting mode is, so that the air conditioner can have enough time duration to defrost the outdoor unit, thereby ensuring the defrosting effect. The smaller the difference value between the first temperature change rate and the first rate threshold value is, the lighter the current frosting degree is, the shorter the defrosting time duration when the air conditioner executes the defrosting mode is, so that the disturbance influence on the air conditioner to maintain the indoor environment temperature due to the defrosting mode of the air conditioner operation can be reduced under the condition of not influencing the defrosting effect.

For example, when the difference between the first temperature change rate and the first rate threshold is less than or equal to 2 ℃, the defrosting time of the current defrosting process is 10 min; when the difference between the first temperature change rate and the first rate threshold is greater than 2 ℃ and less than or equal to 5 ℃, the defrosting time of the current defrosting process is 15 min; when the difference between the first temperature change rate and the first rate threshold is greater than 5 ℃, the defrosting time of the current defrosting process is 25 min; and so on.

As an optional embodiment, when the air conditioner internal fan operates, the heat dissipation rate of the internal coil pipe also can be influenced, and the change rate of the temperature of the internal coil pipe can be directly influenced, so that the calculation accuracy of the defrosting process is improved, and the error influence caused by the operation of the internal fan is reduced; the defrosting control method further includes: acquiring the rotating speed of an inner fan when the air conditioner operates; and determining a set first speed threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

For example, the air conditioner may have a pre-stored correlation between a set wind speed gear range and a set first speed threshold, which may also be measured through experiments before the air conditioner leaves the factory, and the exemplary correlation between the two may include: setting a first speed threshold value to be 5min when the wind speed gear range is a high wind gear; setting a first speed threshold value to be 2min when the wind speed gear range is a medium wind gear; setting a first speed threshold value to be 1min when the wind speed gear range is a low wind gear; here, in the pre-stored association relationship, the set wind speed gear range and the first rate threshold are in a direct proportion relationship, that is, the higher the set wind speed gear range of the inner fan of the air conditioner is, the greater the influence of the inner fan on the temperature change of the inner coil is proved, and under the condition of the same change rate of the temperature of the inner coil, the specific gravity of the temperature influence of the outdoor environment on the inner coil is relatively reduced (that is, the frosting degree is not serious or light), so that the first rate threshold corresponding to the higher set wind speed gear range can be set to be a larger value. On the contrary, the lower the set wind speed gear range of the inner fan of the air conditioner is, the lower the influence of the inner fan on the temperature change of the inner coil is proved to be, and under the condition of the same change rate of the temperature of the inner coil, the proportion of the influence of the outdoor environment on the temperature of the inner coil is relatively increased (namely, the frosting degree is serious), so that the first speed threshold corresponding to the lower set wind speed gear range can be set to be a smaller value.

Fig. 9 is a flowchart illustrating a defrost control method of an air conditioner according to another exemplary embodiment of the present invention.

As shown in fig. 9, the present invention provides a defrosting control method for an air conditioner, wherein the control flow of the defrosting control method may include:

s901, acquiring the temperature of an inner coil pipe when the air conditioner operates, and determining the temperature change rate of the temperature of the inner coil pipe;

in this embodiment, the specific implementation manner of step S901 may refer to step S101 of the previous embodiment, which is not described herein again.

S902, acquiring the indoor environment temperature when the air conditioner operates;

in this embodiment, the specific implementation manner of step S902 may refer to step S201 of the previous embodiment, which is not described herein again.

And S903, controlling the air conditioner to switch to a defrosting mode when the temperature change rate of the temperature of the inner coil is greater than a set rate threshold and the difference value between the set room temperature and the indoor environment temperature is greater than a set temperature difference threshold.

Fig. 10 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention according to an exemplary embodiment.

As shown in fig. 10, the present invention also provides a defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting procedure shown in the embodiment of fig. 1; the defrosting control means 1000 includes:

a first obtaining unit 1010, configured to obtain a temperature of the internal coil during operation of the air conditioner, and determine a temperature change rate of the temperature of the internal coil;

and a first control unit 1020 for controlling the air conditioner to switch to the defrosting mode when the temperature change rate of the inner coil temperature is greater than a set rate threshold.

As an optional embodiment, the first obtaining unit 1010 is specifically configured to:

sequentially detecting at least three inner coil temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two inner coil temperatures which are adjacent in sequence;

and calculating the difference between two temperature differences adjacent in sequence to obtain the temperature change rate.

As an alternative embodiment, the defrosting control means 1000 further includes:

the second acquisition unit is used for acquiring the defrosting time of the previous operation defrosting mode;

As an alternative embodiment, the defrosting control means further includes:

a calculation unit for calculating a difference between the rate of temperature change and a rate threshold;

and the second determining unit is used for determining the defrosting time length when the air conditioner executes the defrosting mode according to the difference between the temperature change rate and the rate threshold value.

the third acquisition unit is used for acquiring the rotating speed of the internal fan when the air conditioner operates;

and the third determining unit is used for determining a set speed threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

Fig. 11 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention according to an exemplary embodiment.

As shown in fig. 11, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 2; the defrosting control device 1100 includes:

the first obtaining unit 1111 is configured to obtain an internal coil temperature and an indoor environment temperature when the air conditioner is running;

the first control unit 1121 is configured to control the air conditioner to switch to the defrosting mode when the temperature of the inner coil is less than a set first temperature threshold and the temperature of the indoor environment is less than a set second temperature threshold.

As an alternative embodiment, the defrosting control unit 1100 further includes:

the first calculation unit is used for calculating the difference value between the temperature of the inner coil and a first temperature threshold value;

and the first determining unit is used for determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the temperature of the inner coil and the first temperature threshold value.

the second calculation unit is used for calculating the difference value between the indoor environment temperature and the second temperature threshold;

and the second determining unit is used for determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the indoor environment temperature and the second temperature threshold value.

the second acquisition unit is used for acquiring the rotating speed of the internal fan when the air conditioner operates;

and the third determining unit is used for determining the set first temperature threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

and the fourth determining unit is used for determining a set second temperature threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

Fig. 12 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention according to an exemplary embodiment.

As shown in fig. 12, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 3; the defrosting control means 1200 includes:

a first obtaining unit 1210, configured to obtain an internal coil temperature and an indoor environment temperature when the air conditioner is in operation;

the first control unit 1220 is configured to control the air conditioner to switch to the defrosting mode when the temperature of the inner coil is smaller than a set temperature threshold and a difference between a set room temperature and an indoor environment temperature is greater than a set temperature difference threshold.

As an alternative embodiment, the defrosting control means 1200 further includes:

the calculating unit is used for calculating the difference value between the temperature of the inner coil and the temperature threshold value;

and the first determining unit is used for determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the temperature of the inner coil and the temperature threshold value.

and the second determining unit is used for determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference value between the set room temperature and the indoor environment temperature.

and the third determining unit is used for determining a set temperature threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

and the fourth determining unit is used for determining a set temperature difference threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

Fig. 13 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention according to an exemplary embodiment.

As shown in fig. 13, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 4; the defrosting control means 1300 includes:

a first obtaining unit 1311, configured to obtain an internal coil temperature and an indoor environment temperature when the air conditioner is in operation;

a first determining unit 1321 for determining a temperature change rate of the inner coil temperature;

and a first control unit 1331 for controlling the air conditioner to switch to the defrosting mode when the temperature change rate of the temperature of the inner coil is greater than a set rate threshold and the indoor environment temperature is less than a set temperature threshold.

As an alternative embodiment, the defrosting control means 1300 further includes:

the first calculation unit is used for calculating the difference value that the temperature change rate of the temperature of the inner coil is greater than a set rate threshold value;

and the second determining unit is used for determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference that the temperature change rate of the temperature of the inner coil is greater than the set rate threshold.

the second calculation unit is used for calculating the difference value between the indoor environment temperature and the temperature threshold;

and the third determining unit is used for determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the indoor environment temperature and the temperature threshold value.

and the fourth determining unit is used for determining a set speed threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

and the fifth determining unit is used for determining the set temperature threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

Fig. 14 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to an exemplary embodiment of the present invention.

As shown in fig. 14, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 5 above; the defrosting control means 1400 includes:

a first obtaining unit 1411, configured to obtain an internal coil temperature and an indoor environment temperature when the air conditioner is in operation;

a first determining unit 1421 for determining a temperature change rate of the inner coil temperature;

the first control unit 1431 is configured to control the air conditioner to switch to the defrosting mode when the temperature change rate of the temperature of the inner coil is greater than a set rate threshold and a difference between the set room temperature and the indoor environment temperature is greater than a set temperature difference threshold.

As an alternative embodiment, the defrosting control 1400 further includes:

the first calculating unit is used for calculating the difference value between the temperature change rate of the temperature of the inner coil and a set rate threshold value;

and the second determining unit is used for determining the defrosting time length when the air conditioner operates in the defrosting mode based on the difference value between the temperature change rate of the temperature of the inner coil and the set rate threshold value.

As an alternative embodiment, the defrosting control 1400 further includes:

and the third determining unit is used for determining the defrosting time length when the air conditioner runs in the defrosting mode based on the difference value between the set room temperature and the indoor environment temperature.

As an alternative embodiment, the defrosting control 1400 further includes:

Fig. 15 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to an exemplary embodiment of the present invention.

As shown in fig. 15, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 6; the defrosting control means 1500 includes:

a first obtaining unit 1511, configured to obtain an indoor environment temperature when an air conditioner is running, and determine a temperature change rate of the indoor environment temperature;

the first control unit 1521 is configured to control the air conditioner to switch to the defrosting mode when the temperature change rate of the indoor environment temperature is greater than a set rate threshold.

As an optional embodiment, the first obtaining unit 1511 is specifically configured to:

sequentially detecting at least three indoor environment temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two indoor environment temperatures which are adjacent in sequence;

and calculating the difference between two temperature difference values adjacent in sequence to obtain the temperature change rate.

As an alternative embodiment, the defrosting control means 1500 further includes:

the second acquisition unit is used for acquiring the defrosting time length of the previous defrosting mode;

a calculation unit for calculating a difference between the rate of temperature change and the rate threshold;

and the third determining unit is used for determining the set speed threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is positioned.

Fig. 16 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention according to an exemplary embodiment.

As shown in fig. 16, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 7 previously; the defrosting control device 1600 includes:

a first obtaining unit 1611, configured to obtain an indoor ambient temperature when the air conditioner is operating;

the first control unit 1621 is configured to control the air conditioner to switch to the defrosting mode when a difference between the set room temperature and the indoor ambient temperature is greater than a set temperature difference threshold.

As an alternative embodiment, the first obtaining unit 1611 is specifically configured to: sequentially detecting at least three indoor environment temperatures at set time intervals;

the first control unit 1621 is specifically configured to:

respectively calculating to obtain the difference value between each set room temperature and the indoor environment temperature;

and when the difference value between all the set room temperature and the indoor environment temperature is greater than the set temperature difference threshold value, controlling the air conditioner to switch to the defrosting mode.

As an alternative embodiment, the defrosting control apparatus 1600 further includes:

and the third determining unit is used for determining a set temperature difference threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.

Fig. 17 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to the present invention, according to an exemplary embodiment.

As shown in fig. 17, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 8 described above; the defrosting control means 1700 includes:

a first obtaining unit 1711, configured to obtain an internal coil temperature when the air conditioner is running, and determine a first temperature change rate of the internal coil temperature;

a second obtaining unit 1712, configured to obtain an indoor environment temperature when the air conditioner is operating, and determine a second temperature change rate of the indoor environment temperature;

the first control unit 1721 is used for controlling the air conditioner to switch to the defrosting mode when the first temperature change rate of the temperature of the inner coil is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold.

As an optional embodiment, the first obtaining unit 1711 is specifically configured to: sequentially detecting at least three inner coil temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two inner coil temperatures which are adjacent in sequence; calculating the difference between two temperature differences adjacent in sequence to obtain a first temperature change rate;

the second obtaining unit 1712 is specifically configured to: sequentially detecting at least three indoor environment temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two indoor environment temperatures which are adjacent in sequence; and calculating the difference between the two temperature differences adjacent in sequence to obtain a second temperature change rate.

As an alternative embodiment, the defrosting control means 1700 further includes:

Fig. 18 is a block diagram illustrating a structure of a defrosting control apparatus of an air conditioner according to an exemplary embodiment of the present invention.

As shown in fig. 18, the present invention provides still another defrosting control device of an air conditioner, which can be used to control the air conditioner to perform the defrosting process shown in the embodiment of fig. 9 previously; the defrost control 1800 includes:

a first obtaining unit 1811, configured to obtain a temperature of the inner coil when the air conditioner is running, and determine a temperature change rate of the temperature of the inner coil;

a second obtaining unit 1812, configured to obtain an indoor ambient temperature when the air conditioner is operating;

the first control unit 1821 is configured to control the air conditioner to switch to the defrosting mode when the temperature change rate of the temperature of the inner coil is greater than a set rate threshold and the difference between the set room temperature and the indoor environment temperature is greater than a set temperature difference threshold.

As an alternative embodiment, the first obtaining unit 1811 is specifically configured to:

As an alternative embodiment, the defrost control 1800 further comprises:

It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A defrosting control method of an air conditioner, characterized by comprising:

the method comprises the steps of obtaining the temperature of an inner coil pipe when an air conditioner operates, and determining a first temperature change rate of the temperature of the inner coil pipe;

acquiring the indoor environment temperature when an air conditioner operates, and determining a second temperature change rate of the indoor environment temperature;

and when the first temperature change rate of the temperature of the inner coil is greater than a set first rate threshold value and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold value, controlling the air conditioner to be switched to a defrosting mode.

2. The defrost control method of claim 1,

the acquiring of the temperature of the inner coil pipe during the operation of the air conditioner and the determining of the first temperature change rate of the temperature of the inner coil pipe comprise: sequentially detecting at least three inner coil temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two inner coil temperatures which are adjacent in sequence; calculating the difference between two temperature differences adjacent in sequence to obtain the first temperature change rate;

the acquiring an indoor environment temperature when the air conditioner operates and determining a second temperature change rate of the indoor environment temperature include: sequentially detecting at least three indoor environment temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two indoor environment temperatures which are adjacent in sequence; and calculating the difference between two temperature difference values adjacent in sequence to obtain the second temperature change rate.

3. The defrost control method of claim 2, further comprising:

acquiring the defrosting time of the previous defrosting mode;

and determining the set time interval according to the defrosting time length.

4. The defrost control method of claim 1, further comprising:

calculating a difference between the first rate of temperature change and the first rate threshold;

and determining the defrosting time length of the air conditioner in the defrosting mode according to the difference between the first temperature change rate and the first speed threshold.

5. The defrost control method of claim 1 or 4, further comprising:

acquiring the rotating speed of an inner fan when the air conditioner operates;

and determining the set first speed threshold value based on the set wind speed gear range in which the rotating speed of the inner fan is located.

6. A defrosting control apparatus of an air conditioner, characterized in that the defrosting control apparatus comprises:

the air conditioner comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring the temperature of an inner coil pipe when the air conditioner operates and determining a first temperature change rate of the temperature of the inner coil pipe;

and the first control unit is used for controlling the air conditioner to be switched to a defrosting mode when the first temperature change rate of the temperature of the inner coil is greater than a set first rate threshold and the temperature change rate of the indoor environment temperature is greater than a set second rate threshold.

7. Defrost control apparatus as in claim 6,

the first obtaining unit is specifically configured to: sequentially detecting at least three inner coil temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two inner coil temperatures which are adjacent in sequence; calculating the difference between two temperature differences adjacent in sequence to obtain the first temperature change rate;

the second obtaining unit is specifically configured to: sequentially detecting at least three indoor environment temperatures at set time intervals, and respectively calculating to obtain temperature difference values between two indoor environment temperatures which are adjacent in sequence; and calculating the difference between two temperature difference values adjacent in sequence to obtain the second temperature change rate.

8. The defrost control device of claim 7, further comprising:

the third acquisition unit is used for acquiring the defrosting time length of the previous defrosting mode;

9. The defrost control device of claim 6, further comprising:

a first calculation unit for calculating a difference between the first rate of temperature change and the first rate threshold;

10. Defrost control apparatus according to claim 6 or 9, characterized in that the defrost control apparatus further comprises:

the fourth acquisition unit is used for acquiring the rotating speed of the internal fan when the air conditioner operates;

and the third determining unit is used for determining the set first speed threshold value based on the set wind speed gear range where the rotating speed of the inner fan is located.