CN107166670A - Self-cleaning control method and device for air conditioner - Google Patents

Abstract

The invention discloses a control method and a device for self-cleaning of an air conditioner, and belongs to the technical field of self-cleaning of air conditioners. The control method comprises the following steps: when the first defrosting mode of the air conditioner is operated and meets the first defrosting completion condition, the air conditioner is controlled to operate in the first defrosting mode; when the running time of the first defrosting mode meets the defrosting time, controlling to run in a second defrosting mode; and if the second frost finishing condition is met, controlling to switch the second frost removing mode to operate. The control method adopts two continuous self-cleaning processes of frost condensation and defrosting, and sets the defrosting time duration of the first defrosting as the characteristic defrosting time duration, so that the condensed water melted during the first defrosting can flow to deep positions such as fin gaps and the like, and the condensed water is not completely separated from the heat exchanger, and further, the second defrosting is utilized to realize frost condensation and dust stripping of the condensed water at the positions such as the fin gaps and the like, thereby improving the integral cleaning effect of the air conditioner and reducing the accumulation of dust at the deep positions of the heat exchanger.

Description

Self-cleaning control method and device for air conditioner

technical field

The invention relates to the technical field of self-cleaning of air conditioners, in particular to a control method and device for self-cleaning of air conditioners.

Background technique

When the indoor unit of the air conditioner is running in cooling or heating mode, the air in the indoor environment enters the interior of the indoor unit along the air inlet of the indoor unit, and is blown back into the indoor environment through the air outlet after the heat exchange fins exchange heat. During this process, impurities such as dust and large particles in the indoor air will also enter the indoor unit with the air intake, although the dust filter installed at the air inlet of the indoor unit can filter most of the dust and particles , but there will still be a small amount of tiny dust that cannot be completely blocked and filtered. With the long-term use of the air conditioner, these dusts will gradually deposit and adhere to the surface of the heat exchanger fins, because the dust covering the outer surface of the heat exchanger has poor thermal conductivity , which will directly affect the heat exchange between the heat exchanger fins and the indoor air. Therefore, in order to ensure the heat exchange efficiency of the indoor unit, it is necessary to clean the indoor unit regularly.

Generally, the cleaning methods of the indoor unit of the air conditioner in the prior art mainly include manual cleaning and self-cleaning of the air conditioner. Among them, the self-cleaning method of the air conditioner is mainly divided into a frosting stage and a defrosting stage. In the frost stage, the air conditioner first operates in cooling mode, and increases the refrigerant output to the indoor heat exchanger, so that the moisture in the indoor air can gradually condense into frost or ice on the outer surface of the heat exchanger. In the process, the condensed frost layer can be combined with the dust to peel the dust from the outer surface of the heat exchanger; after that, in the defrosting stage, the air conditioner operates in heating mode to melt the condensed frost layer on the outer surface of the heat exchanger , the dust will also collect into the water receiving tray along with the melted water flow, so that the self-cleaning purpose of the air conditioner can be achieved.

But for the existing air conditioner structure, the frost layer condensed in the frosting stage is mainly concentrated on the outer surface of the heat exchanger, and the condensed frost between the fins of the heat exchanger is less, resulting in dust between the fins It cannot be peeled off by freezing and frosting, and the fins can only be cleaned by scouring the melted condensed water during the defrosting stage, and the dust removal effect is not good.

Contents of the invention

The invention provides a control method and device for self-cleaning of an air conditioner, aiming to solve the problem that conventional self-cleaning methods cannot clean deep positions such as fin gaps of heat exchangers. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these 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 the first aspect of the present invention, there is provided a self-cleaning control method for an air conditioner, the control method includes: when the air conditioner operates in the first defrosting mode and meets the first frosting completion condition, control to use the first defrosting mode operation; when the running time of the first defrosting mode satisfies the defrosting time, the control operates in the second defrosting mode, wherein the defrosting time is the melting of the condensed frost in the heat exchanger after switching to the first defrosting mode And stay between the fins of the heat exchanger; if the second defrosting completion condition is met, the control switches to the second defrosting mode.

Further, the control method includes: acquiring the indoor ambient temperature of the space where the air conditioner is located; and determining the defrosting duration according to the indoor ambient temperature.

Further, determining the defrosting duration according to the indoor ambient temperature includes: determining the defrosting duration corresponding to the indoor ambient temperature according to a preset correlation between the indoor ambient temperature and the defrosting duration.

Further, according to the preset relationship between the indoor ambient temperature and the defrosting duration, the defrosting duration corresponding to the indoor ambient temperature is determined, including: the defrosting duration is calculated according to the following formula: T _defrosting = K/Tw-Tb, Among them, T is the _defrosting time without defrosting, Tw is the indoor ambient temperature, K is the preset defrosting calculation coefficient, and Tb is the defrosting time compensation amount.

Further, the control method also includes: obtaining the indoor ambient temperature of the space where the air conditioner is located; if the indoor ambient temperature is lower than the set temperature threshold, when the air conditioner is running in the first defrosting mode, turn on the electric auxiliary power of the air conditioner. run hot.

According to the second aspect of the present invention, there is also provided a self-cleaning control device for an air conditioner. The control device includes: a first module, configured to: The control runs in the first defrosting mode; the second module is used to control the running in the second defrosting mode when the running time of the first defrosting mode meets the defrosting time, wherein the defrosting time is the first defrosting time After the frost mode is running, the time for the frost condensed by the heat exchanger to melt and remain between the fins of the heat exchanger; the third module is used to control switching to the second defrosting mode if the second frosting completion condition is met .

Further, the control device further includes: a first acquiring module, configured to acquire the indoor ambient temperature of the space where the air conditioner is located; and a determining module, configured to determine the defrosting duration according to the indoor ambient temperature. The determining module is used for: determining the defrosting duration corresponding to the indoor ambient temperature according to the preset correlation between the indoor ambient temperature and the defrosting duration.

Further, the determination module is used to: calculate the defrosting time according to the following formula: T _defrosting =K/Tw-Tb, wherein, T _{defrosting and} non-defrosting time, Tw is the indoor ambient temperature, and K is the preset defrosting Calculation coefficient, Tb is defrosting time compensation amount.

Further, the control device also includes: a second acquiring module, configured to acquire the indoor ambient temperature of the space where the air conditioner is located; a fourth module, configured to, if the indoor ambient temperature is lower than the set temperature threshold, When running in defrost mode, turn on the electric auxiliary heating of the air conditioner.

The control method of the present invention adopts two consecutive self-cleaning processes of defrosting and defrosting, and sets the duration of defrosting for the first time within the characteristic defrosting duration, so that the condensed water melted during the first defrosting can be It flows to the deep parts such as fin gaps without completely detaching condensed water from the heat exchanger, and then uses the second frosting to realize frost condensation and dust stripping of condensed water in fin gaps and other positions, which improves the overall performance of the air conditioner. Excellent cleaning effect, reducing the accumulation of dust in the deep part of the heat exchanger.

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.

Description of 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 flow chart 1 of the control method of the present invention shown according to an exemplary embodiment;

Fig. 2 is a flowchart 2 of the control method of the present invention shown according to an exemplary embodiment;

Fig. 3 is a structural block diagram of a control device according to an exemplary embodiment of the present invention.

detailed description

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. Herein, various embodiments may be referred to individually or collectively by the term "invention", which is for convenience only and is not intended to automatically limit the scope of this application if in fact more than one invention is disclosed. A single invention or inventive concept. Herein, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without requiring or implying any actual relationship or relationship between these entities or operations. order. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also include elements inherent in such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Various embodiments herein are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of the various embodiments may be referred to each other. As for the methods, products, etc. disclosed in the examples, since they correspond to the methods disclosed in the examples, the description is relatively simple, and for relevant details, please refer to the description of the methods.

Generally, an existing air conditioner includes an indoor heat exchanger, an outdoor heat exchanger, a throttling device, and a compressor, and the indoor heat exchanger, the outdoor heat exchanger, the throttling device, and the compressor are connected through a refrigerant pipeline to form a refrigerant cycle. The refrigerant flows through the refrigerant circulation circuit along the flow direction set by different operation modes to realize its functions of heating, cooling and defrosting.

In an embodiment, the operating modes of the air conditioner of the present invention include a cooling mode, a heating mode and a self-cleaning mode, wherein the cooling mode is generally used in high temperature conditions in summer to reduce the indoor ambient temperature; the heating mode is generally used in winter The low-temperature working condition is used to increase the indoor ambient temperature; while the self-cleaning mode is generally a user-selected function mode, which can automatically clean the heat exchanger when there is a lot of dust and dirt accumulated on the heat exchanger.

Generally, since the indoor heat exchanger is directly used to change the indoor temperature environment, the cleanliness of the indoor heat exchanger can directly affect the user experience. Therefore, the main application object of the self-cleaning mode of the existing air conditioner is the indoor heat exchanger, and the self-cleaning process in the subsequent embodiments is also the self-cleaning object of the indoor heat exchanger. However, this does not mean that the control method of the present invention cannot be applied to the self-cleaning operation of the outdoor heat exchanger. It should be understood that if the existing air conditioner uses the same or similar control method as the present invention for the outdoor heat Self-cleaning operation should also be included in the protection scope of the present invention.

The flow direction of the refrigerant set when the air conditioner is running in cooling mode is that the high-temperature refrigerant discharged from the compressor first flows through the outdoor heat exchanger to exchange heat with the outdoor environment, then flows into the indoor heat exchanger to exchange heat with the indoor environment, and finally flows back to the The compressor performs compression operation again; during this process, the refrigerant flowing through the outdoor heat exchanger releases heat to the outdoor environment, and the refrigerant flowing through the indoor heat exchanger absorbs heat from the indoor environment, and the refrigerant circulates in the refrigerant circulation loop The flow can continuously discharge the indoor heat to the outdoor environment, so as to achieve the cooling purpose of reducing the indoor ambient temperature.

In the heating mode, the refrigerant flow direction set means that the high-temperature refrigerant discharged from the compressor first flows through the indoor heat exchanger to exchange heat with the outdoor environment, then flows into the outdoor heat exchanger to exchange heat with the indoor environment, and finally the refrigerant flows back. During this process, the refrigerant flowing through the indoor heat exchanger releases heat to the indoor environment, and the refrigerant flowing through the outdoor heat exchanger absorbs heat from the outdoor environment. Circulating flow can continuously release the outdoor heat to the indoor environment, so as to achieve the heating purpose of increasing the indoor environment temperature.

The working process of the air conditioner of the present invention when running the self-cleaning mode mainly includes four stages carried out in sequence: the first frosting stage, the first defrosting stage, the second frosting stage and the second defrosting stage, wherein, in the Run the first defrosting mode in the first defrosting stage to make the indoor heat exchanger of the indoor unit condense and frost; run the first defrosting mode in the first defrosting stage to make the indoor heat exchanger freeze in the first defrosting stage The condensed frost melts; run the second defrosting mode in the second defrosting stage to make the indoor heat exchanger of the indoor unit condense and frost again; run the second defrosting mode in the second defrosting stage to make the The frost condensed by the indoor heat exchanger in the second frosting stage melts.

During the operation of the air conditioner in the cooling mode, if the power of the compressor is increased and the refrigerant output is increased, the amount of low-temperature refrigerant input to the indoor unit can be increased, and the excess refrigerant cooling capacity can reduce the internal temperature of the indoor unit. When the temperature inside the air conditioner is lower than the critical temperature of frost condensation (such as 0°C), the water vapor in the air flowing through the indoor unit will gradually condense into frost inside the indoor unit. In the case of the refrigerant flow direction limited by the cooling mode, the frosting operation of the indoor heat exchanger is realized by adjusting the operating parameters of the compressor, fan, throttling device and other components.

Optionally, the first frosting mode operated in the first frosting stage may be the same as or different from the second frosting mode operated in the second frosting stage. That is, the operating parameters of the compressor, fan, throttle opening and other components when the air conditioner is running in the first frosting mode of the self-cleaning mode, and the compressors and fans when the air conditioner is running in the second frosting mode of the self-cleaning mode The operating parameters of components such as the throttling device and the throttling device can be adjusted with the same parameters, or can be adjusted with the same parameters.

While the air conditioner is running in the heating mode, because the high-temperature refrigerant first flows through the indoor heat exchanger, the cooling capacity of the high-temperature refrigerant can increase the internal temperature of the indoor unit, and the temperature inside the indoor unit is higher than that of frost condensation. When the critical temperature value (such as 0°C), the ice and frost condensed inside the indoor unit will gradually melt and drip, so that the ice and frost can be separated from the indoor heat exchanger. The control method of the present invention realizes the defrosting operation of the indoor heat exchanger by adjusting the operating parameters of compressors, fans, throttling devices and other components under the condition that the air conditioner uses the refrigerant flow direction defined by the heating mode.

In another embodiment, the defrosting operation of the air conditioner is through the heat transfer of the indoor environment, so that the natural temperature rise of the indoor heat exchanger is used to defrost. Specifically, the compressor of the air conditioner stops running during the defrosting stage, no refrigerant passes through the indoor heat exchanger, and the internal temperature of the indoor unit is much lower than the indoor ambient temperature. Therefore, the heat of the indoor environment is transferred to the interior of the indoor unit, and the indoor heat exchange The frost layer on the device is affected by the indoor ambient temperature and gradually heats up and melts, which can also achieve the purpose of defrosting and melting ice.

Optionally, the first defrosting mode operated in the first defrosting stage may be the same as or different from the second defrosting mode operated in the second defrosting stage. That is, the operating parameters of the compressor, fan, throttle opening and other components when the air conditioner is running in the first defrosting mode of the self-cleaning mode, and the compressor and fan when the air conditioner is running in the second defrosting mode of the self-cleaning mode The operating parameters of components such as the throttling device and the throttling device can be adjusted with the same parameters, or can be adjusted with the same parameters.

Fig. 1 is a flowchart 1 of a control method of the present invention shown according to an exemplary embodiment.

The invention provides a self-cleaning control method of an air conditioner, which can be used to control the cleaning process of the air conditioner to the heat exchanger. Specifically, the control method includes:

S101. When the air conditioner operates in the first defrosting mode and satisfies the first defrosting completion condition, control to operate in the first defrosting mode;

In this embodiment, the air conditioner can run the self-cleaning mode according to the self-cleaning instruction received. For example, when the user feels that the indoor unit of the air conditioner has a lot of dust and needs to be cleaned, the user can use the remote control or the control panel on the air conditioner body Enter the self-cleaning command, and the air conditioner can control the self-cleaning mode after receiving the self-cleaning command.

When the air conditioner starts to operate in the self-cleaning mode, the air conditioner first operates in the first frosting mode described above. By adjusting the operating parameters of the compressor, fan, throttling device and other components, the internal temperature of the indoor unit is reduced. When the internal temperature drops below the critical temperature of frost condensation, the indoor heat exchanger begins to gradually condense the frost layer, so as to use the frost layer to peel off the dust from the surface of the indoor heat exchanger.

At the same time, when the air conditioner is running in the first frosting mode, the air conditioner judges whether the set first frosting completion condition is satisfied, and if the first frosting completion condition is not satisfied, the air conditioner continues to operate in the first frosting mode; If the first defrosting completion condition is satisfied, the air conditioner is controlled to stop operating in the first defrosting mode, the first defrosting stage ends, and the air conditioner is switched to the first defrosting stage, and the air conditioner operates in the first defrosting mode.

Specifically, the inner coil of the air conditioner is provided with a first temperature sensor. When the air conditioner is running in the first frosting mode, the air conditioner detects the temperature of the inner coil through the first temperature sensor. The temperature of the inner coil is less than or equal to the set first temperature threshold, and the continuous running time of the compressor is greater than or equal to the first set time, the first frosting completion condition is satisfied.

Alternatively, when the temperature of the inner coil is less than or equal to the set second temperature threshold and the duration is greater than or equal to the second set time period, the first frosting completion condition is met.

Of course, the first frosting completion condition in the present invention may also be determined according to other air conditioner parameters, and the present invention is not limited thereto.

S102. When the running time of the first defrosting mode satisfies the defrosting time, control to run in the second defrosting mode;

Wherein, the defrosting time is the time for the frost condensed in the heat exchanger to melt and remain between the fins of the heat exchanger after switching to the first defrosting mode;

In this embodiment, different from the defrosting stage in which the frost completely melts and drips from the indoor heat exchanger in the existing self-cleaning process of the air conditioner, the first defrosting mode in the first defrosting stage of the present invention operates The running time is the set defrosting time. During this defrosting period, the frost layer on the indoor heat exchanger begins to gradually melt into condensed water, which flows along the outer surface of the indoor heat exchanger under the action of gravity, so that the condensed water can flow to the inner surface of the indoor heat exchanger. Deep parts such as fin gaps, and mix with the dust accumulated on these deep parts.

At the same time, during the defrosting period, the condensed water generated on the indoor heat exchanger still resides between the outer surface of the heat exchanger and the fins, which can reserve enough water for the second frosting stage when the second frosting mode is running. The amount of condensed water to ensure the cleaning and dust removal effect.

In this way, when the running time of the first defrosting mode meets the defrosting time, the air conditioner is controlled to run in the second defrosting mode, and the internal temperature of the indoor unit of the air conditioner starts to decrease again, and the internal temperature drops to the frosting critical temperature value, the condensed water will re-condense on the indoor heat exchanger in the state of frost, and, because in the first defrosting stage, the condensed water flows to the deep parts such as the gap between the fins, so the cold water after freezing can be used Expansion force performs deeper self-cleaning on the fin gap, improving the stripping effect on dust and other impurities.

S103. If the second defrosting completion condition is met, control to switch to the second defrosting mode.

In this embodiment, when the air conditioner is running in the second frosting mode, the air conditioner judges whether the set second frosting completion condition is satisfied, and if the second frosting completion condition is not satisfied, the air conditioner continues to run the second frosting mode. Defrost mode; if the second defrost completion condition is met, the air conditioner is controlled to stop operating in the second defrost mode, the second defrost stage ends, and it switches to the second defrost stage, and the air conditioner operates in the second defrost mode .

Optionally, the second frosting completion condition of the present invention may be the same as or different from the aforementioned first frosting completion condition, and the present invention will not repeat them here.

When the second frosting completion condition is met, the air conditioner is controlled to switch to the second frosting mode, so that the frost condensed on the outer surface of the indoor heat exchanger and the gap between the fins melts, and the condensed water gradually drops on the water receiving tray In the middle, the dust on the indoor heat exchanger can be washed away together, so as to achieve the self-cleaning purpose of the indoor heat exchanger.

In this embodiment, the first defrosting stage adopts the second method in the foregoing embodiments to defrost the indoor heat exchanger, that is, the heat of the indoor environment is used to naturally melt the frost layer on the indoor heat exchanger. Since the compressor stops inputting low-temperature refrigerant to the indoor heat exchanger, and the heat from the indoor environment is transferred to the interior of the indoor unit, the indoor ambient temperature can directly affect the melting rate of the frost layer on the indoor heat exchanger. The higher the value, the faster the frost melting rate and the shorter the defrosting time, and vice versa. Therefore, the present invention acquires the indoor ambient temperature of the space where the air conditioner is located, and determines the defrosting duration according to the indoor ambient temperature.

In one embodiment, the air conditioner is provided with a second temperature sensor or is externally connected with a second temperature sensor, which can be used to detect the indoor ambient temperature, so as to determine the defrosting time of the air conditioner in the first defrosting mode according to the indoor ambient temperature.

In one embodiment, before the air conditioner leaves the factory, a large number of experiments can obtain the correlation data of the indoor environment temperature and the defrosting duration, and determine the correlation relationship between the two according to the correlation data. For example, in the correlation relationship, when the indoor environment is 15°C, 20 ℃, 25℃ and 30℃, the corresponding defrosting time is 2min, 1min40s, 1min20s and 1min respectively. The relationship between different indoor ambient temperatures and their corresponding defrosting durations can be saved in table form.

In this way, by presetting the association relationship in the air conditioner, when the air conditioner is running in self-cleaning mode, according to the detected current indoor ambient temperature, by matching the corresponding defrosting time in the association relationship, it can be determined that the current indoor environment The defrosting time when the air conditioner runs the first defrosting mode under the temperature condition.

In an embodiment, the association relationship is stored in the form of a calculation formula. According to the associated data obtained from the experiment, the calculation formula of the indoor ambient temperature and the defrosting time can be fitted. In this way, according to the detected current indoor ambient temperature, the corresponding defrosting time can be obtained through the calculation formula, and the current defrosting time can be determined. The defrosting time when the air conditioner is running in the first defrosting mode under the indoor ambient temperature.

In a specific embodiment, the formula for calculating the defrosting duration and the indoor ambient temperature is as follows:

T _defrost = K/Tw-Tb,

Among them, T is the _defrosting time without defrosting, Tw is the indoor ambient temperature, K is the preset defrosting calculation coefficient, and Tb is the defrosting time compensation amount.

In the embodiment, K is related to the type and size of the indoor heat exchanger. After the first frosting, the K value of different similar indoor units is different. Therefore, before the air conditioner leaves the factory, the K value can be determined according to the assembled air conditioner. The type of indoor heat exchanger is predetermined.

The value of Tb is related to the indoor ambient temperature, and the compensation value Tb is not linearly related to the ambient temperature. Therefore, the correlation table between Tb and the indoor ambient temperature can be determined according to the experimental data, and stored in the built-in program of the air conditioner. In this way, after the current indoor ambient temperature is determined, the Tb value can be determined by means of table lookup.

In an embodiment, when the first defrosting stage of the air conditioner ends, the compressor is shut down, and remains shut down during the first defrosting stage, and in the second frosting stage, the compressor of the air conditioner is restarted. Therefore, when the air conditioner is running in the second defrosting mode, a start command is sent to the compressor. There is an initialization time of tens of seconds between the compressor receiving the start command and the compressor officially starting operation. At this stage, the indoor heat exchanger Still continuing to defrost. At the same time, the temperature of the indoor heat exchanger during defrosting is higher than the critical temperature of frost condensation. Therefore, the indoor unit will not freeze at this stage until the temperature of the indoor heat exchanger drops below the critical frost condensation temperature after the compressor is officially started. Frost, the defrost process is still going on, therefore, Tb compensation is used in the calculation formula to compensate for the time from when the compressor receives the startup command to when the temperature of the indoor heat exchanger drops below the frost critical temperature.

In the embodiment of the present invention, if the air conditioner performs self-cleaning in winter low temperature weather, when the first defrosting stage adopts the second method in the foregoing embodiment to defrost the indoor heat exchanger, due to the indoor environment The temperature is lower, and the temperature difference with the indoor unit is small, so the heat transferred from the indoor environment to the indoor unit is also less, which leads to the extension of the duration of the defrosting time. Therefore, in order to speed up the operation of the air conditioner in the first defrosting mode The defrosting rate shortens the defrosting time. The air conditioner of the present invention can judge whether the current indoor ambient temperature is lower than the set temperature threshold. If so, control the electric auxiliary heating function of the air conditioner to use the electric auxiliary heat The heat speeds up the melting rate of the frost layer on the indoor heat exchanger. If the indoor ambient temperature is not lower than the set temperature threshold, the air conditioner is still running in the set first defrosting mode, and the electric auxiliary heating operation of the air conditioner is not turned on.

Fig. 2 is a second flow chart of the control method of the present invention shown according to an exemplary embodiment.

In the application scenario shown in Figure 2, the specific flow of the self-cleaning operation of the air conditioner of the present invention is as follows:

S201. Receive a self-cleaning instruction input by a user;

In this embodiment, the user selects the preset self-cleaning option through the remote controller or the control panel, and confirms; the remote controller or the control panel sends the self-cleaning instruction to the main controller of the air conditioner, and the main controller of the air conditioner receives After the self-cleaning instruction, the air conditioner can be controlled to enter the self-cleaning mode;

S202, the air conditioner operates in the first frosting mode;

In the embodiment, when the air conditioner operates in the first frosting mode, the refrigerant circulates in the same flow direction as that in the cooling mode, and the refrigerant flowing to the indoor heat exchanger is low-temperature refrigerant.

At the same time, the operating power of the compressor is increased to increase the refrigerant output; the air deflector of the indoor unit is closed, and the internal fan is stopped to reduce the temperature impact on the indoor environment.

S203. Determine whether the first frosting completion condition is satisfied? If yes, then execute step S204, if no, then continue to execute step S202;

In an embodiment, the first defrosting completion condition is that the temperature of the inner coil is less than or equal to a set first temperature threshold, and the continuous running time of the compressor is greater than or equal to the first set time.

Therefore, step S203 includes the first sub-step of obtaining the temperature of the inner coil and the duration of continuous operation of the compressor in the first defrosting mode.

Alternatively, the first defrosting completion condition is that the temperature of the inner coil is less than or equal to the set second temperature threshold and the duration is greater than or equal to the second set time period.

Therefore, step S203 includes the second sub-step, obtaining the temperature of the inner coil, and in the first defrosting mode, the duration for which the temperature of the inner coil is less than or equal to the set second temperature threshold

S204. Acquiring the indoor ambient temperature;

In an embodiment, the indoor ambient temperature is detected by a second temperature sensor disposed on the indoor unit.

S205. Determine the defrosting duration according to the indoor ambient temperature;

In the embodiment, the detected indoor ambient temperature is substituted into the calculation formula T _defrosting =K/Tw-Tb, and the calculated T _defrosting is the duration of defrosting required for the air conditioner to operate in the second defrosting mode;

S206, the air conditioner operates in the first defrosting mode;

In an embodiment, when the air conditioner operates in the first defrosting mode, the compressor stops running, and the refrigerant in the air conditioner stops flowing and circulating.

Simultaneously, the air deflector of the indoor unit is opened, and the internal fan operates or remains in a shutdown state, so that the heat of the indoor environment can be transferred to the interior of the indoor unit, and the frost layer condensed on the outer surface of the indoor heat exchanger begins to melt.

S207. Determine whether the duration of the air conditioner running in the first defrosting mode is greater than or equal to the defrosting duration? If yes, then execute step S208, if no, then continue to execute step S206;

S208, the air conditioner operates in the second frosting mode;

Optionally, when the air conditioner is running in the second frosting mode, the parameter adjustments to components such as the compressor, the fan, and the throttling device are the same as when the air conditioner is running in the first frosting mode, and details are not repeated here.

S209. Determine whether the second frosting completion condition is satisfied? If yes, then execute step S210, if no, then continue to execute step S208;

Optionally, the conditions for completing the second frost condensation are the same as the above-mentioned conditions for completing the first frost condensation, which will not be described again.

S210, the air conditioner operates in the second defrosting mode, and the process ends.

In this way, through two consecutive defrost-defrost stages, and the duration of the first defrost stage is controlled within the set defrost duration, the dust and impurities in the deep parts such as the fin gaps can be cleaned, thereby effectively Improve the self-cleaning effect of the air conditioner.

Fig. 3 is a structural block diagram of a control device according to an exemplary embodiment of the present invention.

The present invention also provides a self-cleaning control device for an air conditioner. The control device includes: a first module 301 for controlling the first defrosting mode when the air conditioner operates in the first defrosting mode and meets the first defrosting completion condition. mode operation; the second module 302 is used to control the operation in the second defrosting mode when the operating duration of the first defrosting mode meets the defrosting duration, wherein the defrosting duration is after switching the operation of the first defrosting mode, The length of time for the frost condensed in the heat exchanger to melt and stay between the fins of the heat exchanger; the third module 303 is used to control switching to the second defrosting mode if the second defrosting completion condition is satisfied.

In the embodiment, the control device further includes: a first acquiring module 304, configured to acquire the indoor ambient temperature of the space where the air conditioner is located; and a determining module 305, configured to determine the defrosting duration according to the indoor ambient temperature.

In an embodiment, the determining module 305 is configured to: determine the defrosting duration corresponding to the indoor ambient temperature according to the preset correlation between the indoor ambient temperature and the defrosting duration.

In an embodiment, the determination module 305 is used to: calculate the defrosting duration according to the following formula: T _defrosting =K/Tw-Tb, where T _{defrosting and} non-defrosting duration, Tw is the indoor ambient temperature, and K is the preset The defrosting calculation coefficient, Tb is the defrosting time compensation amount.

In an embodiment, the control device further includes: a second acquisition module 306, configured to acquire the indoor ambient temperature of the space where the air conditioner is located; a fourth module 307, configured to, if the indoor ambient temperature is lower than the set temperature threshold, When the air conditioner is running in the first defrosting mode, turn on the electric auxiliary heating operation of the air conditioner.

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

Claims (10)

1. A control method for air conditioner self-cleaning, characterized in that the control method comprises: When the air conditioner operates in the first defrosting mode and meets the first defrosting completion condition, control to operate in the first defrosting mode; When the running time of the first defrosting mode satisfies the defrosting time, the control operates in the second defrosting mode, wherein the defrosting time is the heat exchanger after the first defrosting mode is switched. How long it takes for condensed frost to melt and stay between the heat exchanger fins; If the second defrosting completion condition is met, the control switches to the second defrosting mode. 2. The control method according to claim 1, characterized in that, the control method comprises: Obtain the indoor ambient temperature of the space where the air conditioner is located; The defrosting duration is determined according to the indoor ambient temperature. 3. The control method according to claim 2, wherein the determining the defrosting duration according to the indoor ambient temperature comprises: According to the preset correlation between the indoor ambient temperature and the defrosting duration, the defrosting duration corresponding to the indoor ambient temperature is determined. 4. The control method according to claim 3, wherein, according to the preset relationship between the indoor ambient temperature and the defrosting duration, determining the defrosting duration corresponding to the indoor ambient temperature comprises: the The defrosting time is calculated according to the following formula: T _defrost = K/Tw-Tb, Wherein, T is the _defrosting duration described above, Tw is the indoor ambient temperature, K is the preset defrosting calculation coefficient, and Tb is the defrosting duration compensation amount. 5. The control method according to claim 1, wherein the control method further comprises: Obtain the indoor ambient temperature of the space where the air conditioner is located; If the indoor ambient temperature is lower than the set temperature threshold, when the air conditioner operates in the first defrosting mode, the electric auxiliary heating operation of the air conditioner is turned on. 6. A self-cleaning control device for an air conditioner, characterized in that the control device comprises: The first module is used to control the air conditioner to operate in the first defrosting mode when the first defrosting mode meets the first defrosting completion condition; The second module is used to control the operation in the second defrosting mode when the operating duration of the first defrosting mode meets the defrosting duration, wherein the defrosting duration is when switching the operation of the first defrosting mode Afterwards, the time for the frost condensed on the heat exchanger to melt and remain between the fins of the heat exchanger; The third module is configured to control switching to the second defrosting mode if the second defrosting completion condition is met. 7. The control device according to claim 6, characterized in that, the control device further comprises: A first acquisition module, configured to acquire the indoor ambient temperature of the space where the air conditioner is located; A determining module, configured to determine the defrosting duration according to the indoor ambient temperature. 8. The control device according to claim 7, wherein the determination module is used for: According to the preset correlation between the indoor ambient temperature and the defrosting duration, the defrosting duration corresponding to the indoor ambient temperature is determined. 9. The control device according to claim 8, wherein the determining module is used to: calculate and obtain the defrosting duration according to the following formula: T _defrost = K/Tw-Tb, Wherein, T is the _defrosting duration described above, Tw is the indoor ambient temperature, K is the preset defrosting calculation coefficient, and Tb is the defrosting duration compensation amount. 10. The control device according to claim 6, further comprising: The second acquiring module is used to acquire the indoor ambient temperature of the space where the air conditioner is located; The fourth module is configured to turn on the electric auxiliary heating operation of the air conditioner when the air conditioner operates in the first defrosting mode if the indoor ambient temperature is lower than a set temperature threshold.