CN110873390B

CN110873390B - Air conditioner and self-cleaning control method thereof

Info

Publication number: CN110873390B
Application number: CN201811007007.0A
Authority: CN
Inventors: 许文明; 罗荣邦
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd; Chongqing Haier Air Conditioner Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd; Chongqing Haier Air Conditioner Co Ltd
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2021-09-21
Anticipated expiration: 2038-08-31
Also published as: CN110873390A

Abstract

The invention discloses an air conditioner and a self-cleaning control method thereof, and belongs to the technical field of air conditioners. The control method comprises the following steps: responding to the condition that the air conditioner meets the triggering condition of the self-cleaning mode, and determining the deviation amount of the current state parameter and the reference state parameter of the air conditioner; the reference state parameter is used for representing a state parameter when the air conditioner meets the set cleaning requirement; and selecting a self-cleaning mode executed by the current self-cleaning process based on the deviation value of the current state parameter and the reference state parameter. According to the control method for self-cleaning of the air conditioner, the self-cleaning mode meeting the cleaning requirement of the current working condition is selected from the multiple self-cleaning modes according to the deviation amount of the current state parameter and the reference state parameter of the air conditioner, the cleaning effect of the air conditioner on common pollutants such as dust and pollutants with strong adhesive force such as oil stains is improved, and the self-cleaning efficiency of the air conditioner on pollutants with different properties is effectively ensured.

Description

Air conditioner and self-cleaning control method thereof

Technical Field

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

Background

When the air conditioner operates in a cooling or heating mode, air in an external environment enters the inside of the machine body along the air inlet, and is blown into the external environment again through the air outlet after heat exchange of the heat exchange plate, in the process, impurities such as dust, large particles and the like mixed in the air can enter the indoor machine along with air inlet flow, although a dustproof filter screen arranged at the air inlet of the air conditioner can filter most of the dust and the particles, a small amount of tiny dust can not be completely blocked and filtered, and the dust can be gradually deposited and attached to the surface of the heat exchange plate along with long-term use of the air conditioner.

Generally, a cleaning method of an air conditioner in the prior art mainly includes two modes of manual cleaning and self cleaning of the air conditioner, wherein the self cleaning mode of the air conditioner is mainly divided into a frost condensation stage and a defrosting stage, wherein, taking an indoor unit of a split air conditioner as an example, in the frost condensation stage, the air conditioner firstly operates in a refrigeration mode, and increases refrigerant output quantity to an indoor heat exchanger, so that moisture in indoor air can be gradually condensed into a frost or ice layer on the outer surface of the heat exchanger, and in the process, the condensed frost layer can be combined with dust, so that the dust is peeled off from the outer surface of the heat exchanger; then, in the defrosting stage, the air conditioner operates in a heating mode to melt the frost layer condensed on the outer surface of the heat exchanger, and dust can be collected into the water receiving tray along with the melted water flow, so that the aim of self-cleaning the indoor unit of the air conditioner can be fulfilled; similarly, when the outdoor unit of the split air conditioner is cleaned, the self-cleaning operation is performed according to a reverse flow to that of the indoor unit, that is, the air conditioner operates the heating mode (the temperature of the outdoor unit is reduced, and the frost is condensed) and then operates the cooling mode (the temperature of the outdoor unit is increased, and the frost is melted).

For the air conditioner applied to some special scenes (such as a kitchen), the pollutants accumulated on the heat exchanger in the long-term use process not only contain dust, but also contain substances with strong adhesive force, such as oil stains, and the like, so that the pollutants on the heat exchanger are difficult to be completely removed only through the self-cleaning process of the condensation-defrosting.

Disclosure of Invention

The invention provides an air conditioner and a self-cleaning control method thereof, and aims to solve the problem that the existing self-cleaning process in a single self-cleaning mode is difficult to adapt to different pollutant removal requirements. 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 control method for self-cleaning of an air conditioner, comprising:

responding to the condition that the air conditioner meets the triggering condition of the self-cleaning mode, and determining the deviation amount of the current state parameter and the reference state parameter of the air conditioner; the reference state parameter is used for representing a state parameter when the air conditioner meets the set cleaning requirement;

selecting a self-cleaning mode executed by the current self-cleaning process based on the deviation value of the current state parameter and the reference state parameter; the self-cleaning mode includes at least a frost-melting cleaning mode, a cold-hot expansion cleaning mode, and a high-temperature steam washing mode.

In an alternative embodiment, the current state parameter of the air conditioner comprises a current coil temperature of a heat exchanger to be cleaned of the air conditioner;

the reference state parameter includes a reference coil temperature of a heat exchanger to be cleaned of the air conditioner.

In an alternative embodiment, the selecting the self-cleaning mode executed by the current self-cleaning process based on the deviation amount of the current state parameter from the reference state parameter includes:

when the temperature difference value between the current coil temperature and the reference coil temperature is smaller than a first temperature difference threshold value, selecting a self-cleaning mode executed by the current self-cleaning process as a frost condensation-defrosting cleaning mode;

when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a first temperature difference threshold value and smaller than or equal to a second temperature difference threshold value, selecting a self-cleaning mode executed by the current self-cleaning process as a cold-hot expansion cleaning mode;

and when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a second temperature difference threshold value, selecting the self-cleaning mode executed by the current self-cleaning process as a high-temperature steam cleaning mode.

In an alternative embodiment, the cold thermal expansion cleaning mode includes a cooling contraction flow and a heating expansion flow for the heat exchanger to be cleaned;

wherein, the refrigeration contraction process comprises: controlling the air conditioner to operate a refrigeration mode according to set operation parameters so as to reduce the temperature of the heat exchanger to be cleaned to be below the set frost condensation temperature;

the heating expansion process comprises the following steps: and controlling the air conditioner to operate the heating mode according to the set operation parameters so as to increase the temperature of the heat exchanger to be cleaned to be higher than the set heating temperature.

In an alternative embodiment, the high temperature steam washing mode includes: an electric heating device for controlling the opening of the bottom of the water receiving tray.

According to the second aspect of the present invention, there is also provided an air conditioner comprising a machine body and a controller, wherein the controller is configured to:

In an alternative embodiment, the controller is specifically configured to:

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

according to the control method for self-cleaning of the air conditioner, the self-cleaning mode meeting the cleaning requirement of the current working condition is selected from multiple self-cleaning modes such as a frost condensation-defrosting cleaning mode, a cold and hot expansion cleaning mode, a high-temperature steam cleaning mode and the like according to the deviation amount of the current state parameter of the air conditioner and the reference state parameter, the cleaning effect of the air conditioner on common pollutants such as dust and the like and pollutants with strong adhesive force such as oil stains and the like is improved, and the self-cleaning efficiency of the air conditioner on pollutants with different properties is effectively ensured.

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

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

FIG. 2 is a second flowchart illustrating a self-cleaning control method of an air conditioner according to another exemplary embodiment of the present invention;

fig. 3 is a third flowchart illustrating a control method for self-cleaning of an air conditioner according to another exemplary embodiment of the present invention.

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 air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a throttling device and a compressor, wherein the indoor heat exchanger, the outdoor heat exchanger, the throttling device and the compressor are connected through refrigerant pipelines to form a refrigerant circulation loop, and refrigerant flows along the set flow directions of different operation modes through the refrigerant circulation loop, so that the functions of heating, refrigerating, self-cleaning and the like are realized.

In an embodiment, the operation modes of the air conditioner comprise a refrigeration mode, a heating mode and a self-cleaning mode, wherein the refrigeration mode is generally applied to a high-temperature working condition in summer and used for reducing the indoor environment temperature; the heating mode is generally applied to the low-temperature working condition in winter and is used for increasing the indoor environment temperature; the self-cleaning mode is generally a user's self-selection function mode or self-starting function, and can automatically clean the heat exchanger under the condition that dust and dirt are accumulated on the heat exchanger.

When the air conditioner operates in a refrigeration mode, the set refrigerant flow direction is that high-temperature refrigerant discharged by the compressor firstly 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 the refrigerant flows back to the compressor to be compressed again; in the process, the refrigerant flowing through the outdoor heat exchanger emits heat to the outdoor environment, the refrigerant flowing through the indoor heat exchanger absorbs heat from the indoor environment, and the indoor heat can be continuously discharged to the outdoor environment through the circulating flow of the refrigerant in the refrigerant circulating loop, so that the refrigeration purpose of reducing the temperature of the indoor environment can be achieved.

The set refrigerant flow direction during the heating mode refers to that the high-temperature refrigerant discharged by the compressor firstly 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 flows back to the compressor to be compressed again; in the process, the refrigerant flowing through the indoor heat exchanger emits heat to the indoor environment, the refrigerant flowing through the outdoor heat exchanger absorbs heat from the outdoor environment, and the outdoor heat can be continuously released to the indoor environment through the circulating flow of the refrigerant in the refrigerant circulating loop, so that the heating purpose of improving the temperature of the indoor environment can be achieved.

Generally, since the indoor heat exchanger is a heat exchanger directly used for changing an indoor temperature environment, the degree of cleanliness of the indoor heat exchanger may directly affect the use experience of a user. Therefore, the main application of the self-cleaning mode of the air conditioner of the present invention is an indoor heat exchanger. Of course, the self-cleaning mode of the air conditioner of the present invention may also be used to clean the outdoor heat exchanger, so in a specific embodiment, when the air conditioner of the present invention performs a cleaning process, only one of the indoor heat exchanger and the outdoor heat exchanger may be cleaned, or both of the indoor heat exchanger and the outdoor heat exchanger may be cleaned. It should be understood that if the existing air conditioner uses the same or similar control method as the present invention to perform the self-cleaning operation of the indoor and outdoor heat exchangers, it should be also included in the protection scope of the present invention.

Taking the self-cleaning process of the indoor heat exchanger as an example, the self-cleaning mode of the air conditioner operation of the invention comprises but is not limited to a cold and hot expansion cleaning mode, a high-temperature steam cleaning mode and a frost condensation-defrosting cleaning mode; correspondingly, the self-cleaning process includes, but is not limited to, a cold-hot expansion process, a high-temperature steam cleaning process and a frost formation process; the cold and hot expansion process can be subdivided into two sub-processes of a refrigeration contraction process and a heating expansion process, and the frost formation and defrosting process can be subdivided into two sub-processes of a frost formation process and a defrosting stage.

Optionally, the air conditioner of the present invention may combine multiple self-cleaning processes to perform a cleaning operation on the heat exchanger in the process of performing the self-cleaning mode once according to the actual cleaning requirement, for example, in the process of performing the self-cleaning mode once, a cold-hot expansion process and a frost condensation and defrosting process are sequentially and respectively performed; alternatively, one of the self-cleaning processes may be combined with one or more sub-processes of one or more other self-cleaning processes to perform a cleaning operation on the heat exchanger, such as combining a cold-hot expansion process with a frost-forming process or a defrosting process in a frost-forming and defrosting process during a single self-cleaning mode; alternatively, one or more sub-processes of one of the self-cleaning processes may be combined with one or more sub-processes of the other one or more self-cleaning processes to perform a cleaning operation on the heat exchanger, such as a cooling contraction process or a heating expansion process of a cooling-heating expansion process and a defrosting process of a defrosting process in a single self-cleaning mode. One or more flow combinations in the self-cleaning flows can be preset in the air conditioner, and then the air conditioner can select the adaptive flow combination according to the actual cleaning requirement so as to utilize the cleaning flow defined by the flow combination to clean the heat exchanger for dust removal.

Specifically, for the cold and hot expansion process, taking an indoor heat exchanger as an example, the working process mainly includes two stages which are sequentially performed: a cooling contraction stage defined by a cold-hot expansion process and a heating expansion stage defined by a heating expansion process. The invention utilizes the characteristic that the volume expansion rates of the heat exchanger and the oil stain attached to the heat exchanger are different when the heat exchanger is heated or cooled, and the heat-cold expansion process is executed for one time or multiple times, so that the volume change of the heat exchanger and the oil stain under different cold and hot states can generate a gap between the heat exchanger and the oil stain, the adhesive force of the oil stain on the heat exchanger is reduced, and the effective separation of the heat exchanger and the oil stain is realized.

The invention reduces the temperature of the indoor heat exchanger by adjusting the operation parameters of the compressor, the fan, the throttling device and other components under the condition of controlling the flow direction of the refrigerant limited by the air conditioner in the refrigeration mode in the refrigeration contraction stage, because the oil stain is attached to the indoor heat exchanger and can transfer heat between the two, the temperature of the oil stain per se is also reduced along with the indoor heat exchanger, and because the volume expansion rates of the heat exchanger and the oil stain attached to the heat exchanger are different when the temperature is reduced, the contraction volumes of the heat exchanger and the oil stain are different under the condition of the same temperature variation, so that the oil stain is peeled off from the attachment position of the heat exchanger; after the stage of switching to the heating expansion, the air conditioner is controlled to convey the refrigerant to the indoor heat exchanger in the refrigerant flow direction limited by the heating mode, the temperature of the indoor heat exchanger is raised through adjusting the operation parameters of components such as a compressor, a fan, a throttling device and the like, the temperature of the oil stain per se is also raised along with the indoor heat exchanger, and meanwhile, due to the fact that the volume expansion rates of the indoor heat exchanger and the throttling device are different, under the condition of the same temperature variation amount in the temperature raising process, the volumes of the heat expansion of the indoor heat exchanger and the oil stain are different, the oil stain begins to expand from the contraction attachment position of the heat exchanger in the previous refrigeration contraction stage to increase the volume, the attachment viscosity between the indoor heat exchanger and the oil stain is reduced again, and the oil stain can be separated from the heat exchanger more easily.

Before the air conditioner leaves a factory, different pollutant samples (such as different types of pollutant samples divided by regions or using areas of the air conditioner) on a heat exchanger used by a user can be collected, the volume expansion rates of the different pollutant samples are measured and calculated in an experiment mode and the like, and parameters and the like corresponding to the optimal stripping effect of the pollutants and the indoor heat exchanger in the switching change process of different refrigerating temperatures and heating temperatures between the two are further measured and calculated according to one or more materials of the indoor heat exchanger; the parameters are prestored in components such as an electric control board, an MCU and the like of the air conditioner, so that when the air conditioner needs to clean the indoor heat exchanger in a self-cleaning mode defined by a cold and hot expansion process, the parameters can be called, and thus data such as running parameters and the like needed to be set when the self-cleaning mode is executed are determined.

For the high-temperature steam cleaning process, in an alternative embodiment, the indoor heat exchanger is a heat exchanger to be cleaned, wherein the indoor unit is provided with a high-temperature steam device, the high-temperature steam device comprises a steam generator and a water storage device, the steam generator is used for generating high-temperature steam, and a steam injection opening of the steam generator faces the indoor heat exchanger, so that the high-temperature steam generated by the steam generator can be injected to the heat exchanger; the water storage device is used for storing water required by the steam generator for generating high-temperature steam; here, after the high-temperature steam is sprayed to the indoor heat exchanger, contaminants such as dust and oil stains adhered to the outer surface of the indoor heat exchanger may be washed away, and the contaminants may be separated from the outer surface of the indoor heat exchanger.

Or, in a further alternative embodiment, the body of the air conditioner comprises a water pan arranged below the indoor heat exchanger; the bottom of the water pan is provided with a heating device which is used for heating the water accumulated in the water pan to a state of generating high-temperature steam. After the heating device is started, the temperature of the water accumulated in the water receiving tray is gradually increased and finally becomes a boiling state, and the accumulated water part becomes gaseous steam; the water pan is positioned below the indoor heat exchanger, and the density of high-temperature steam is low, so that the high-temperature steam can rise and diffuse into gaps of heat exchange fins of the indoor heat exchanger, and oil stains are heated and expanded and separated from the indoor heat exchanger; thus, the air conditioning structure design of the embodiment can also play a role in high-temperature steam cleaning.

For the flow of frost formation and defrosting, the indoor heat exchanger is taken as an example, and the working flow mainly comprises two stages which are sequentially carried out: the defrosting process comprises an indoor heat exchanger defrosting stage defined by a defrosting process and an indoor heat exchanger defrosting stage defined by a defrosting process. In the defrosting stage of the indoor heat exchanger, ice can be condensed and frosted on the indoor heat exchanger of the indoor unit; in the defrosting stage of the indoor heat exchanger, the condensed frost of the indoor heat exchanger in the previous defrosting stage is melted, impurities such as dust and the like can be separated from the indoor heat exchanger along with the melted condensed water, and the cleaning treatment of the indoor heat exchanger is completed.

Specifically, in the operation process of the air conditioner in the refrigeration mode, if the power of the compressor is improved and the output quantity of the refrigerant is increased, the low-temperature refrigerant quantity input into the indoor unit can be increased, the redundant refrigerant cold quantity can reduce the internal temperature of the indoor unit, and when the internal temperature of the indoor unit is lower than the frost condensation critical temperature value (such as 0 ℃), water vapor in air flowing through the indoor unit can be gradually condensed into frost in the indoor unit.

In the heating mode operation process of the air conditioner, the high-temperature refrigerant firstly flows through the indoor heat exchanger, so that the cold energy of the high-temperature refrigerant can increase the internal temperature of the indoor unit, and when the internal temperature of the indoor unit is higher than the frost condensation critical temperature value (such as 0 ℃), the frost condensed in the indoor unit can be gradually melted and dripped, so that the frost can be separated from the indoor heat exchanger. The control method of the invention is that under the condition that the flow direction of the refrigerant limited by the heating mode of the air conditioner is controlled at the defrosting stage of the indoor heat exchanger, the defrosting operation of the indoor heat exchanger is realized by adjusting the operation parameters of components such as a compressor, a fan, a throttling device and the like.

Similarly, when the outdoor heat exchanger is self-cleaned, when the air conditioner flows in the refrigerant flow direction defined by the heating mode, the refrigerant flowing out of the indoor heat exchanger is a medium-temperature refrigerant and the refrigerant flowing into the outdoor heat exchanger after being throttled by the throttling device is a low-temperature refrigerant, so that the low-temperature refrigerant can reduce the temperature of the outdoor heat exchanger, and when the temperature inside the outdoor unit is lower than the frost condensation critical temperature value (such as 0 ℃), water vapor in the air flowing through the outdoor unit can be gradually condensed into frost inside the outdoor unit. Therefore, the ice and the frost of the outdoor heat exchanger are realized while the ice and the frost of the indoor heat exchanger are melted.

And then, the indoor heat exchanger finishes melting ice and defrosting in the defrosting stage of the indoor heat exchanger, self-cleaning of the indoor heat exchanger is finished, the air conditioner enters the defrosting stage of the outdoor heat exchanger, at the moment, the air conditioner is controlled to flow in the direction of the refrigerant flow defined by the refrigeration mode again, the flow direction of the high-temperature refrigerant discharged by the compressor is changed, and the high-temperature refrigerant flows through the outdoor heat exchanger, so that the ice and defrosting of the outdoor heat exchanger can be realized by utilizing the heat of the high-temperature refrigerant, and the self-cleaning process of the outdoor heat exchanger is finished.

In the self-cleaning process, each stage can be performed according to a preset time length, for example, the defrosting stage of the indoor heat exchanger can be preset to 10min, and the defrosting stage of the indoor heat exchanger can be preset to 12min, so that the air conditioner can start timing after the air conditioner enters the defrosting stage of the indoor heat exchanger in the self-cleaning mode, when the time reaches 10min, the air conditioner enters the defrosting stage of the indoor heat exchanger, the defrosting stage of the indoor heat exchanger lasts for 12min, it can be determined that the self-cleaning of the indoor unit is finished, and the air conditioner exits the self-cleaning mode.

In the process that the air conditioner is switched to the flow direction limited by the cooling mode or the heating mode, the opening/closing and the rotating speed of the fans of the indoor unit and the outdoor unit also need to be correspondingly controlled, for example, the indoor fan in the frost condensation stage of the indoor heat exchanger is generally closed or operated at a low speed, and the outdoor fan is opened for operation; and in the defrosting stage of the indoor heat exchanger, the indoor fan is started to operate, and outdoor air is closed or operated at a low speed. Therefore, the indoor unit and the outdoor unit are respectively timed in the self-cleaning process, and when the preset time is reached, the components such as a fan of the air conditioner and the like are controlled to carry out corresponding state switching.

Therefore, the invention provides one or more air conditioners and a self-cleaning control method thereof, aiming at solving the technical problem that pollutants such as oil stains with strong adhesive force are not easy to remove.

Fig. 1 is a first flowchart illustrating a control method for self-cleaning of an air conditioner according to an exemplary embodiment of the present invention.

As shown in fig. 1, the present invention provides a control method for self-cleaning of an air conditioner, which mainly comprises the following steps:

s101, responding to the condition that the air conditioner meets the trigger condition of the self-cleaning mode, and determining whether each self-cleaning mode in multiple self-cleaning modes of the air conditioner meets a preset mode selection rule;

here, the plurality of self-cleaning modes at least include: a frost-defrosting cleaning mode, a cold and hot expansion cleaning mode and a high-temperature steam cleaning mode;

optionally, the triggering condition of the self-cleaning mode is that the accumulated running time of the air conditioner reaches a set accumulated time threshold; or, the self-cleaning triggering condition is that a control instruction for starting self-cleaning input by a user is received;

or controlling the air conditioner to operate according to preset reference parameters to obtain the current coil temperature of the heat exchanger; determining the scaling degree of a heat exchanger of the air conditioner according to the comparison result of the current coil temperature and the preset reference coil temperature; and judging whether the triggering condition of the self-cleaning mode is met or not based on the scaling degree.

Before the air conditioner leaves a factory, the temperature of the coil pipe when the air conditioner runs with preset reference parameters can be measured in modes of experiments and the like and is used as the reference coil pipe temperature; at the moment, no pollutant is attached to the air conditioner, so that the temperature of the reference coil can be used for representing parameters of the heat exchanger in a pollutant-free state; because the pollutant attached to the air conditioner can influence the heat exchange efficiency of the heat exchanger, the pollutant can also influence the temperature of the coil, and the temperature of the coil measured on the heat exchanger attached with the pollutant is different from the temperature of a reference coil measured on the heat exchanger not attached with the pollutant in value, so that the scaling degree of the heat exchanger of the air conditioner is determined according to the comparison result of the current temperature of the coil and the preset temperature of the reference coil.

In this embodiment, the more contaminants are attached to the heat exchanger, the greater the temperature difference between the current coil temperature and the reference coil temperature is; the fewer pollutants are attached to the heat exchanger, the smaller the temperature difference between the current coil temperature and the reference coil temperature is; namely the two are in positive correlation; therefore, the air conditioner can preset the correlation between the comparison result of the current coil temperature and the preset reference coil temperature and the scaling degree of the heat exchanger; thus, after the current coil temperature of the heat exchanger is obtained, the scaling degree of the heat exchanger of the air conditioner can be determined according to the reference coil temperature and the preset incidence relation; a threshold value for indicating that the degree of fouling is high and that cleaning is required is set, and the triggering condition is that the determined degree of fouling of the heat exchanger of the air conditioner is greater than or equal to the threshold value.

Optionally, in step S101, it is determined whether each of the multiple self-cleaning modes of the air conditioner satisfies a preset mode selection rule, and the specific steps are as follows: determining the accumulated time length of each self-cleaning mode in a plurality of self-cleaning modes of the air conditioner from the previous execution to the present; and if the accumulated time length of the self-cleaning mode meets the preset time length condition, determining that the self-cleaning mode meets the preset mode selection rule.

For example, the execution time of the previous time of the self-cleaning process defined by the air conditioner in the frost-melting mode is 4 months and 6 days, and the preset duration condition is 3 days, if the current time point is 4 months and 9 days or even later, and the accumulated duration between the current time point and the previous execution time meets the preset duration condition, the frost-melting mode is determined to meet the preset mode selection rule; and if the current time point is 4 months, 7 days or 8 days, and the accumulated time length between the current time point and the previous execution time does not meet the preset time length condition, determining that the frost-defrosting mode does not meet the preset mode selection rule. Here, the time and the operation time are not limited to the day as a reference unit, and may be measured in units of hours, weeks, and the like.

Here, the specific self-cleaning mode of the previously executed self-cleaning process should be the same as the self-cleaning mode currently determined by the mode selection rule.

Meanwhile, the previous execution flows corresponding to the judgment processes of the mode selection rules of different self-cleaning modes are different. For example, the air conditioner performs a self-cleaning process defined by a frost-melting mode in day 4 and day 5, and the air conditioner performs a self-cleaning process defined by a cold-hot expansion cleaning mode in day 4 and day 12; when the current time point is 5 months and 1 day, and the mode selection rule is judged for the frost condensation-defrosting mode, 4 months and 5 days are taken as the time point of the previous execution flow, and the accumulated time length between 4 months and 5 months and 1 day is calculated; when the mode selection rule is judged for the cold and hot expansion cleaning mode, 4-month-12 days are taken as the time point of the previous self-cleaning process, and the accumulated time length between 4-month-12 days and 5-month-1 days is calculated.

S102, selecting a self-cleaning mode meeting a preset mode selection rule as the self-cleaning mode executed by the current self-cleaning flow.

Here, after the self-cleaning mode is selected, the self-cleaning operation of the air conditioner is performed according to a self-cleaning flow defined by the selected self-cleaning mode. If the self-cleaning mode selected in step S102 is the frost-melting mode, the current self-cleaning process is a cleaning process defined by the frost-melting mode, and the specific implementation manner of the cleaning process may refer to the foregoing description, which is not described herein again.

The control method for self-cleaning of the air conditioner selects the self-cleaning mode meeting the cleaning requirement of the current working condition from a plurality of self-cleaning modes such as a frost condensation-defrosting cleaning mode, a cold and hot expansion cleaning mode, a high-temperature steam cleaning mode and the like according to the preset mode selection rule, improves the cleaning effect of the air conditioner on common pollutants such as dust and the like and pollutants with strong adhesive force such as oil stains and the like, and effectively ensures the self-cleaning efficiency of the air conditioner on pollutants with different properties.

The control method further comprises the following steps: if two or more self-cleaning modes meet the preset mode selection rule, the self-cleaning mode with the highest priority is selected as the self-cleaning mode executed by the current self-cleaning process according to the preset priority rule.

Optionally, the priority is a high-temperature steam washing mode, a cold and hot expansion cleaning mode and a frost-defrosting cleaning mode from high to low in sequence.

For example, when it is determined in step S101 that the high-temperature steam cleaning mode and the frost-frost melting mode satisfy the corresponding mode selection rules, the high-temperature steam cleaning mode may be determined to be the self-cleaning mode executed by the current self-cleaning process according to the priority.

Here, the order of the priorities from high to low corresponds to the cleaning effect of the self-cleaning mode from high to low, that is, the cleaning effects of the high-temperature steam washing mode, the cold and hot expansion cleaning mode and the frost-melting cleaning mode from high to low, and the degree of fouling of the corresponding heat exchangers is also from high to low; when both the self-cleaning mode with a high priority and the self-cleaning mode with a low priority meet the corresponding mode selection rule, the actual scaling degree of the heat exchanger reaches the scaling degree corresponding to the self-cleaning mode with a high priority, so that the self-cleaning mode with a high priority is started to clean the heat exchanger by utilizing the higher cleaning effect of the self-cleaning mode, the self-cleaning operation of the heat exchanger can be adapted to the actual dust removal requirement of the heat exchanger, and the cleaning effect is ensured.

In one embodiment of the invention, the cold and hot expansion cleaning mode comprises a refrigeration contraction process and a heating expansion process for the heat exchanger to be cleaned;

specifically, the flow for controlling the air conditioner to execute the refrigeration contraction comprises the following steps: controlling the air conditioner to operate a refrigeration mode according to set operation parameters so as to reduce the temperature of the heat exchanger to be cleaned to be below a set refrigeration contraction temperature; optionally, the refrigeration contraction temperature is a frost condensation temperature set at a frost condensation stage of a frost condensation and defrosting process of the air conditioner, that is, the temperature of the heat exchanger to be cleaned is reduced to be below the frost condensation temperature by controlling the air conditioner to operate a refrigeration mode according to set operation parameters.

Here, if the air conditioner does not preset a frost condensation and defrosting process, the frost condensation temperature may be prestored in the air conditioner as one temperature data and associated with the cooling contraction process; in this way, during the cooling contraction flow of the air conditioner, the temperature data can be used as the target temperature of the indoor heat exchanger, and the temperature of the indoor heat exchanger can be reduced to be lower than or equal to the target temperature by adjusting components such as a compressor, a throttling device and a fan of the air conditioner based on the target temperature.

The process of controlling the air conditioner to execute the heating expansion comprises the following steps: controlling the air conditioner to operate a heating mode according to set operation parameters so as to reduce the temperature of the heat exchanger to be cleaned to be above a set heating expansion temperature; optionally, the heating expansion temperature is a defrosting temperature set in a defrosting stage of a defrosting process of the air conditioner, that is, the temperature of the heat exchanger to be cleaned is reduced to be higher than the defrosting temperature by controlling the air conditioner to operate a heating mode according to set operation parameters.

Here, if the air conditioner does not preset a frost condensation and defrosting process, the defrosting temperature may be prestored in the air conditioner as one temperature data and associated with the heating expansion process; in this way, in the heating and expansion flow performed by the air conditioner, the temperature data can be used as the target temperature of the indoor heat exchanger, and the temperature of the indoor heat exchanger in the heating and expansion flow can be reduced to the target temperature or higher by adjusting components such as a compressor, a throttle device, and a fan of the air conditioner based on the target temperature.

Optionally, the heating expansion temperature set in the heating expansion process is 50 ℃.

Optionally, the controlling the air conditioner to execute the high-temperature steam cleaning process includes: the heating device at the bottom of the water receiving tray is controlled to be started.

Or, the invention controls the air conditioner to execute the high-temperature steam cleaning process, which comprises the following steps: and controlling to start the high-temperature steam device.

Optionally, the device for generating steam, which is started to execute the high-temperature steam cleaning process, may be determined according to a usage scenario of the air conditioner; for example, when the use environment is a kitchen and other scenes with more oil stains, a high-temperature steam device can be selected to perform steam cleaning on the indoor heat exchanger; and when the service environment is the more scene of greasy dirt such as bedroom, then the optional heating device that opens, here, the mode that heating device produced high temperature steam compares in high temperature steam device, and its steam air current is more soft and the noise that produces is less, is applicable to the little scene of demand noise, has reduced the uncomfortable influence that the air conditioner execution high temperature steam washs the flow and causes the user. Here, the usage scenario of the air conditioner may be set by user input.

Optionally, before the heating device of water collector bottom is opened in the control, control air conditioner execution high temperature steam washs the flow, still includes: detecting the water quantity of the water receiving tray; if the water quantity meets the preset water quantity condition, controlling to start a heating device at the bottom of the water receiving tray; if the water quantity does not meet the preset water quantity condition, the heating device at the bottom of the water receiving tray is not controlled to be started; and/or controlling the water supply pipe to replenish water to the water receiving tray.

Here, the source of the water using the heating device to generate the high-temperature steam is the water accumulated in the water receiving tray; when the water in the water receiving tray is insufficient, if the heating device still runs, the problem of dry burning of the water receiving tray can be caused, and the problems of fire and the like can be easily caused; therefore, before the heating device at the bottom of the water pan is controlled to be started, the water quantity of the water pan is detected, and the heating device at the bottom of the water pan is controlled to be started only under the condition that the water quantity meets the preset water quantity condition, so that the safety of the air conditioner for executing a high-temperature steam cleaning process is ensured.

Fig. 2 is a second flowchart illustrating a self-cleaning 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 control method for self-cleaning of an air conditioner, which mainly comprises the following steps:

s201, responding to the condition that the air conditioner meets the trigger condition of the self-cleaning mode, and determining the deviation amount of the current state parameter and the reference state parameter of the air conditioner; the reference state parameter is used for representing a state parameter when the air conditioner meets the set cleaning requirement;

Here, the current state parameter of the air conditioner includes a current coil temperature of a heat exchanger to be cleaned of the air conditioner; the reference state parameter includes a reference coil temperature of a heat exchanger to be cleaned of the air conditioner. The reference coil temperature is used for representing the coil temperature when the air conditioner meets the set cleaning requirement, and at the moment, no pollutant or the pollutant amount in the indoor unit is lower than the set minimum pollutant amount.

Therefore, the deviation amount between the current status parameter of the air conditioner and the reference status parameter determined in step S201 is the temperature difference between the current coil temperature and the reference coil temperature.

S202, selecting a self-cleaning mode executed by the current self-cleaning process based on the deviation value of the current state parameter and the reference state parameter; the self-cleaning mode includes at least a frost-melting cleaning mode, a cold-hot expansion cleaning mode, and a high-temperature steam washing mode.

Before the air conditioner leaves a factory, the temperature of the coil pipe when the air conditioner runs with preset reference parameters can be measured in modes of experiments and the like and is used as the reference coil pipe temperature; at the moment, no pollutant is attached to the air conditioner, so that the temperature of the reference coil can be used for representing parameters of the heat exchanger in a pollutant-free state; because the pollutant that adheres to on the air conditioner can influence the heat exchange efficiency of heat exchanger, consequently it also can influence the temperature of coil pipe, and there is the difference in numerical value between the coil pipe temperature that measures on the heat exchanger that adheres to the pollutant and the benchmark coil pipe temperature that measures on the heat exchanger that does not adhere to the pollutant, consequently, according to the difference in temperature of current coil pipe temperature and preset benchmark coil pipe temperature, can confirm the scale deposit degree of the heat exchanger of air conditioner.

In this embodiment, the more contaminants are attached to the heat exchanger, the greater the temperature difference between the current coil temperature and the reference coil temperature is; the fewer pollutants are attached to the heat exchanger, the smaller the temperature difference between the current coil temperature and the reference coil temperature is; namely the two are in positive correlation; therefore, the air conditioner can preset the correlation between the temperature difference value between the current coil temperature and the preset reference coil temperature and the scaling degree of the heat exchanger; thus, after the current coil temperature of the heat exchanger is obtained, the scaling degree of the heat exchanger of the air conditioner can be determined according to the reference coil temperature and the preset incidence relation; and then the self-cleaning mode suitable for the current working condition can be selected according to the scaling degree.

Optionally, the selecting a self-cleaning mode executed by the current self-cleaning process based on the deviation between the current state parameter and the reference state parameter includes:

when the temperature difference value between the current coil temperature and the reference coil temperature is smaller than a first temperature difference threshold value, selecting a self-cleaning mode executed by the current self-cleaning process as a frost condensation-defrosting cleaning mode; for example, if the temperature difference value between the current coil temperature and the reference coil temperature is Δ T, and the first temperature difference threshold is T1, when Δ T is less than T1, the self-cleaning mode executed by the current self-cleaning process is a frost condensation-frost removal cleaning mode, where the first temperature difference threshold T1 is a preset threshold parameter; and the number of the first and second groups,

when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a first temperature difference threshold value and smaller than or equal to a second temperature difference threshold value, selecting a self-cleaning mode executed by the current self-cleaning process as a cold-hot expansion cleaning mode; for example, if the second temperature difference threshold is T2, the self-cleaning mode executed by the current self-cleaning process is a cold-hot expansion cleaning mode when T1 <. DELTA.T ≦ T2, wherein the second temperature difference threshold T2 is also a preset threshold parameter; and the number of the first and second groups,

when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a second temperature difference threshold value, selecting a self-cleaning mode executed by the current self-cleaning process as a high-temperature steam cleaning mode; for example, when Δ T > T2, the self-cleaning mode executed by the current self-cleaning process is the high-temperature steam cleaning mode, wherein the second temperature difference threshold T2 is also the preset threshold parameter.

Here, the cleaning effects of the three self-cleaning modes are high to low in sequence from the high-temperature steam cleaning mode, the cold-hot expansion cleaning mode and the frost-melting cleaning mode, and the scaling degree of the corresponding heat exchanger is also high to low; when the temperature difference value is within the range of the temperature difference interval with a larger value, the actual scaling degree of the heat exchanger is more, so that the self-cleaning mode with higher cleaning effect is started, the heat exchanger is cleaned by utilizing the higher cleaning effect, the self-cleaning operation of the heat exchanger can be matched with the actual dust removal requirement of the heat exchanger, and the cleaning effect is ensured.

As shown in fig. 3, the present invention provides another control method for self-cleaning of an air conditioner, which mainly comprises the following steps:

s301, controlling the air conditioner to execute a self-cleaning mode defined by a first self-cleaning process in response to the fact that the air conditioner meets a trigger condition of the self-cleaning mode;

In this embodiment, the self-cleaning mode defined by the air conditioner performing the first self-cleaning process is at least one of the following modes: a frost-defrosting cleaning mode, a cold and hot expansion cleaning mode and a high-temperature steam cleaning mode.

S302, determining the deviation amount of the current state parameter and the reference state parameter of the air conditioner; the reference state parameter is used for representing a state parameter when the air conditioner meets the set cleaning requirement;

here, before step S302, it is also necessary to acquire a current state parameter of the air conditioner after executing the self-cleaning mode defined by the first self-cleaning process;

Therefore, the deviation amount between the current status parameter of the air conditioner and the reference status parameter determined in step S302 is the temperature difference between the current coil temperature and the reference coil temperature.

S303, selecting a self-cleaning mode executed by the secondary self-cleaning process based on the deviation value of the current state parameter and the reference state parameter; the self-cleaning mode includes at least a frost-melting cleaning mode, a cold-hot expansion cleaning mode, and a high-temperature steam washing mode.

In this embodiment, the more contaminants are attached to the heat exchanger, the greater the temperature difference between the current coil temperature and the reference coil temperature is; the fewer pollutants are attached to the heat exchanger, the smaller the temperature difference between the current coil temperature and the reference coil temperature is; namely the two are in positive correlation; therefore, the air conditioner can preset the correlation between the temperature difference value between the current coil temperature and the preset reference coil temperature and the scaling degree of the heat exchanger; thus, after the current coil temperature of the heat exchanger is obtained, the scaling degree of the heat exchanger of the air conditioner can be determined according to the reference coil temperature and the preset incidence relation; and then the self-cleaning mode executed by the secondary self-cleaning process suitable for the current working condition can be selected according to the scaling degree.

Optionally, the self-cleaning mode executed by the secondary self-cleaning process based on the deviation between the current state parameter and the reference state parameter includes:

when the temperature difference value between the current coil temperature and the reference coil temperature is smaller than a first temperature difference threshold value, selecting a self-cleaning mode executed by a secondary self-cleaning process as a frost condensation-defrosting cleaning mode; for example, if the temperature difference value between the current coil temperature and the reference coil temperature is Δ T, and the first temperature difference threshold is T1, when Δ T is less than T1, the self-cleaning mode executed by the secondary self-cleaning process is a frost condensation-defrosting cleaning mode, where the first temperature difference threshold T1 is a preset threshold parameter; and the number of the first and second groups,

when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a first temperature difference threshold value and smaller than or equal to a second temperature difference threshold value, selecting a self-cleaning mode executed by a secondary self-cleaning process as a cold-hot expansion cleaning mode; for example, if the second temperature difference threshold is T2, the self-cleaning mode executed by the secondary self-cleaning process is a cold-hot expansion cleaning mode when T1 <. DELTA.T ≦ T2, wherein the second temperature difference threshold T2 is also a preset threshold parameter; and the number of the first and second groups,

when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a second temperature difference threshold value, selecting a self-cleaning mode executed by a secondary self-cleaning process as a high-temperature steam cleaning mode; for example, when Δ T > T2, the self-cleaning mode performed by the secondary self-cleaning process is a high-temperature steam cleaning mode, wherein the second temperature difference threshold T2 is also a preset threshold parameter.

In an alternative embodiment, the air conditioning garment generally includes a body and a controller that may be used to control the control flow disclosed in the embodiment of fig. 1 above.

Specifically, the controller is configured to:

responding to the triggering condition that the air conditioner meets the self-cleaning mode, and determining whether each self-cleaning mode in multiple self-cleaning modes of the air conditioner meets a preset mode selection rule; the plurality of self-cleaning modes at least includes: a frost-defrosting cleaning mode, a cold and hot expansion cleaning mode and a high-temperature steam cleaning mode;

and selecting the self-cleaning mode meeting the preset mode selection rule as the self-cleaning mode executed by the current self-cleaning process.

In an alternative embodiment, the controller is specifically configured to:

determining the accumulated time length of each self-cleaning mode in a plurality of self-cleaning modes of the air conditioner from the previous execution to the present;

and if the accumulated time length of the self-cleaning mode meets the preset time length condition, determining that the self-cleaning mode meets the preset mode selection rule.

In an alternative embodiment, the controller is further configured to:

if two or more self-cleaning modes meet the preset mode selection rule, the self-cleaning mode with the highest priority is selected as the self-cleaning mode executed by the current self-cleaning process according to the preset priority rule.

In an alternative embodiment, the priority is a high-temperature steam washing mode, a cold-hot expansion cleaning mode, and a frost-defrosting cleaning mode in order from high to low.

The specific manner in which the controller controls the above process can refer to the foregoing embodiments, and is not described herein again.

In yet another alternative embodiment, the controller of the air conditioning garment may be used to control the control flow disclosed in the embodiment of fig. 2 above.

Specifically, the controller is configured to:

In an alternative embodiment, the controller is specifically configured to:

In yet another alternative embodiment, the controller of the air conditioning garment may be used to control the control flow disclosed in the embodiment of fig. 3 above.

Specifically, the controller is configured to:

responding to the condition that the air conditioner meets the triggering condition of the self-cleaning mode, and controlling the air conditioner to execute the self-cleaning mode defined by the first self-cleaning process;

determining the deviation amount of the current state parameter and the reference state parameter of the air conditioner; the reference state parameter is used for representing a state parameter when the air conditioner meets the set cleaning requirement;

selecting a self-cleaning mode executed by the secondary self-cleaning process based on the deviation value of the current state parameter and the reference state parameter; the self-cleaning mode includes at least a frost-melting cleaning mode, a cold-hot expansion cleaning mode, and a high-temperature steam washing mode.

In an alternative embodiment, the controller is specifically configured to:

when the temperature difference value between the current coil temperature and the reference coil temperature is smaller than a first temperature difference threshold value, selecting a self-cleaning mode executed by a secondary self-cleaning process as a frost condensation-defrosting cleaning mode;

when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a first temperature difference threshold value and smaller than or equal to a second temperature difference threshold value, selecting a self-cleaning mode executed by a secondary self-cleaning process as a cold-hot expansion cleaning mode;

and when the temperature difference value between the current coil temperature and the reference coil temperature is larger than a second temperature difference threshold value, selecting the self-cleaning mode executed by the secondary self-cleaning process as a high-temperature steam cleaning mode.

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 control method for self-cleaning of an air conditioner is characterized by comprising the following steps:

responding to the condition that the air conditioner meets the triggering condition of a self-cleaning mode, and determining the deviation amount of the current coil temperature of a heat exchanger to be cleaned of the air conditioner and the reference coil temperature; the reference coil temperature is used for representing state parameters when the air conditioner meets the set cleaning requirement;

selecting a self-cleaning mode executed by the current self-cleaning process based on the deviation value of the current coil temperature and the reference coil temperature; the self-cleaning mode at least comprises a frost-melting cleaning mode, a cold-hot expansion cleaning mode and a high-temperature steam cleaning mode; the cold and hot expansion mode comprises a refrigeration contraction process and a heating expansion process aiming at a heat exchanger to be cleaned; the operation parameters of the refrigeration contraction process are determined based on the volume expansion rate of the heat exchanger and the pollutants;

2. The control method according to claim 1, wherein the cold thermal expansion cleaning mode includes a cooling contraction flow and a heating expansion flow for a heat exchanger to be cleaned;

wherein, the refrigeration contraction process comprises: controlling the air conditioner to operate a refrigeration mode according to set operation parameters so as to reduce the temperature of the heat exchanger to be cleaned to be below a set frost condensation temperature;

the heating expansion process comprises the following steps: and controlling the air conditioner to operate a heating mode according to set operation parameters so as to increase the temperature of the heat exchanger to be cleaned to be higher than a set heating temperature.

3. The control method according to claim 1, wherein the high-temperature steam washing mode includes: an electric heating device for controlling the opening of the bottom of the water receiving tray.

4. An air conditioner, characterized in that, the air conditioner includes an organism and a controller, wherein, the controller is used for:

5. The air conditioner according to claim 4, wherein the cool-heat expansion cleaning mode includes a cooling contraction process and a heating expansion process for a heat exchanger to be cleaned;

6. The air conditioner according to claim 4, wherein the high temperature steam washing mode includes: an electric heating device for controlling the opening of the bottom of the water receiving tray.