1. A self-cleaning control method of an air conditioner is characterized in that the air conditioner comprises a low-voltage protection switch, and the control method comprises the following steps:

determining a target self-cleaning mode in response to a self-cleaning instruction, wherein the target self-cleaning mode comprises a frosting phase and a defrosting phase;

determining a target heat exchanger to be cleaned according to the target self-cleaning mode;

acquiring the temperature of a coil of the target heat exchanger to be cleaned;

and in the frosting stage, controlling the fan corresponding to the target heat exchanger to be cleaned to stop running, controlling the frequency of a compressor and the rotating speed of the running fan according to the temperature of a coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, and controlling the opening degree of a throttling element according to the actual superheat degree of the air conditioner.

2. The self-cleaning control method of an air conditioner according to claim 1, wherein the target self-cleaning mode is a self-cleaning mode of an indoor heat exchanger, and the controlling of the compressor frequency and the rotational speed of the running fan according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the refrigerant low-pressure protection threshold of the low-pressure protection switch comprises:

determining that the temperature of a coil of an indoor heat exchanger is greater than a first temperature threshold value, controlling a compressor to respond to an ascending frequency instruction and not respond to a descending frequency instruction, and controlling an outdoor fan to respond to an ascending speed instruction and not respond to a descending speed instruction, wherein the first temperature threshold value is the sum of the saturation temperature and a preset temperature difference for preventing a low-voltage protection switch from starting protection action;

or determining that the temperature of the coil of the indoor heat exchanger is smaller than the first temperature threshold, controlling the compressor to respond to the frequency reduction instruction and not respond to the frequency increase instruction, and controlling the outdoor fan to respond to the speed reduction instruction and not respond to the speed increase instruction;

or determining that the temperature of the coil of the indoor heat exchanger is equal to the first temperature threshold, controlling the compressor to maintain the current frequency, and controlling the outdoor fan to maintain the current rotating speed.

3. An air conditioner self-cleaning control method as claimed in claim 2, wherein said controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner comprises:

acquiring the exhaust temperature of a compressor and the temperature of an outdoor heat exchanger sensor;

obtaining an actual superheat degree according to the discharge temperature of the compressor and the temperature of the outdoor heat exchanger sensor;

determining that the difference value between the actual superheat degree and the target superheat degree is larger than a superheat degree threshold value, and controlling the opening degree of the throttling element to increase by using a preset opening degree amplitude;

or determining that the difference value between the actual superheat degree and the target superheat degree is smaller than a superheat degree threshold value, and controlling the opening degree of the throttling element to be reduced by a preset opening degree amplitude.

4. The self-cleaning control method of an air conditioner as claimed in claim 1, wherein the target self-cleaning mode is an outdoor heat exchanger self-cleaning mode, and the controlling of the compressor frequency and the rotational speed of the running fan according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the refrigerant low-pressure protection threshold of the low-pressure protection switch comprises:

determining that the temperature of a coil of an outdoor heat exchanger is greater than a first temperature threshold, controlling a compressor to respond to an ascending frequency instruction and not respond to a descending frequency instruction, and controlling an indoor fan to respond to an ascending speed instruction and not respond to a descending speed instruction, wherein the first temperature threshold is the sum of the saturation temperature and a preset temperature difference for preventing a low-voltage protection switch from starting protection action;

or determining that the temperature of the coil of the outdoor heat exchanger is smaller than the first temperature threshold, controlling the compressor to respond to the frequency reduction instruction and not respond to the frequency increase instruction, and controlling the indoor fan to respond to the speed reduction instruction and not respond to the speed increase instruction;

or determining that the temperature of the coil of the outdoor heat exchanger is equal to the first temperature threshold, controlling the compressor to maintain the current frequency, and controlling the indoor fan to maintain the current rotating speed.

5. An air conditioner self-cleaning control method as claimed in claim 4, wherein said controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner comprises:

acquiring the exhaust temperature of a compressor and the temperature of an indoor heat exchanger sensor;

obtaining an actual superheat degree according to the exhaust temperature of the compressor and the temperature of the indoor heat exchanger sensor;

determining that the difference value between the actual superheat degree and the target superheat degree is larger than a superheat degree threshold value, and controlling the opening degree of the throttling element to increase by using a preset opening degree amplitude;

or determining that the difference value between the actual superheat degree and the target superheat degree is smaller than a superheat degree threshold value, and controlling the opening degree of the throttling element to be reduced by a preset opening degree amplitude.

6. An air conditioner self-cleaning control method as claimed in claim 1, wherein said control method further comprises:

and determining that the temperature of the coil of the target heat exchanger to be cleaned is less than the frosting exit temperature and maintaining the temperature for a first preset time, and controlling the air conditioner to exit the frosting stage.

7. The air conditioner self-cleaning control method as claimed in claim 6, wherein after controlling the air conditioner to exit the frosting stage, the control method further comprises:

controlling the air conditioner to enter the defrosting stage;

and determining that the temperature of the coil of the target heat exchanger to be cleaned is greater than the defrosting exit temperature and maintaining for a second preset time, and controlling the air conditioner to exit the target self-cleaning mode.

8. An air conditioner self-cleaning control device, comprising:

a self-cleaning mode determination module for determining a target self-cleaning mode in response to a self-cleaning instruction, wherein the target self-cleaning mode comprises a frosting phase and a defrosting phase;

the target heat exchanger determining module is used for determining a target heat exchanger to be cleaned according to the target self-cleaning mode;

the acquisition module is used for acquiring the temperature of the coil of the target heat exchanger to be cleaned;

and the control module is used for controlling the fan corresponding to the target heat exchanger to be cleaned to stop running in the frosting stage, controlling the frequency of the compressor and the rotating speed of the running fan according to the temperature of the coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, and controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner.

9. A computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the air conditioner self-cleaning control method of any one of claims 1-7.

10. An air conditioner, comprising:

the system comprises a compressor, an indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan and a throttling element;

a controller for controlling a frequency of the compressor, rotation speeds of the indoor fan and the outdoor fan, and an opening degree of the throttling element according to the air conditioner self-cleaning control method of any one of claims 1 to 7.

Background

The nature of the self-cleaning control mode of the air conditioner is to frost and defrost the heat exchanger. In order to make the heat exchanger frosted smoothly, the fan on the frosting side is usually stopped. However, for the air conditioner with the low-voltage protection switch, after the fan stops, the low-voltage protection switch is started due to the fact that the refrigerant pressure of the air conditioning system is too low, and therefore self-cleaning action cannot be continuously performed.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a self-cleaning control method for an air conditioner, which can ensure that the pressure of a refrigerant in a system meets a low-pressure requirement during the self-cleaning process of the air conditioner provided with a low-pressure protection switch, and avoid the problem that the self-cleaning cannot be completed due to the shutdown caused by the start of the low-pressure protection switch.

The second objective of the present invention is to provide a self-cleaning control device for air conditioner.

It is a further object of the present invention to provide a computer storage medium.

The fourth objective of the present invention is to provide an air conditioner.

In order to solve the above problem, an embodiment of a first aspect of the present invention provides a self-cleaning control method for an air conditioner, where the air conditioner includes a low-voltage protection switch, and the control method includes: determining a target self-cleaning mode in response to a self-cleaning instruction, wherein the target self-cleaning mode comprises a frosting phase and a defrosting phase; determining a target heat exchanger to be cleaned according to the target self-cleaning mode; acquiring the temperature of a coil of the target heat exchanger to be cleaned; and in the frosting stage, controlling the fan corresponding to the target heat exchanger to be cleaned to stop running, controlling the frequency of a compressor and the rotating speed of the running fan according to the temperature of a coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, and controlling the opening degree of a throttling element according to the actual superheat degree of the air conditioner.

According to the air conditioner self-cleaning control method provided by the embodiment of the invention, in the frosting stage, the frequency of the compressor, the rotating speed of the running fan and the opening degree of the throttling element are controlled through the temperature of the coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, so that the pressure of the refrigerant in the system is dynamically adjusted, the refrigerant pressure in the self-cleaning process is ensured to meet the low-pressure requirement, the problem of triggering low-pressure protection is avoided, the action of the low-pressure protection switch can be effectively avoided, the normal operation of the self-cleaning function is ensured, and the reliability of the air conditioner is improved.

In some embodiments, the target self-cleaning mode is a self-cleaning mode of an indoor heat exchanger, and the controlling the frequency of the compressor and the rotating speed of the running fan according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold of the refrigerant of the low-pressure protection switch includes: determining that the temperature of a coil of an indoor heat exchanger is greater than a first temperature threshold value, controlling a compressor to respond to an ascending frequency instruction and not respond to a descending frequency instruction, and controlling an outdoor fan to respond to an ascending speed instruction and not respond to a descending speed instruction, wherein the first temperature threshold value is the sum of the saturation temperature and a preset temperature difference for preventing a low-voltage protection switch from starting protection action; or determining that the temperature of the coil of the indoor heat exchanger is smaller than the first temperature threshold, controlling the compressor to respond to the frequency reduction instruction and not respond to the frequency increase instruction, and controlling the outdoor fan to respond to the speed reduction instruction and not respond to the speed increase instruction; or determining that the temperature of the coil of the indoor heat exchanger is equal to the first temperature threshold, controlling the compressor to maintain the current frequency, and controlling the outdoor fan to maintain the current rotating speed.

In some embodiments, the controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner comprises: acquiring the exhaust temperature of a compressor and the temperature of an outdoor heat exchanger sensor; obtaining an actual superheat degree according to the discharge temperature of the compressor and the temperature of the outdoor heat exchanger sensor; determining that the difference value between the actual superheat degree and the target superheat degree is larger than a superheat degree threshold value, and controlling the opening degree of the throttling element to increase by using a preset opening degree amplitude; or determining that the difference value between the actual superheat degree and the target superheat degree is smaller than a superheat degree threshold value, and controlling the opening degree of the throttling element to be reduced by a preset opening degree amplitude.

In some embodiments, the target self-cleaning mode is an outdoor heat exchanger self-cleaning mode, and the controlling the frequency of the compressor and the rotating speed of the running fan according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the refrigerant low-pressure protection threshold of the low-pressure protection switch includes: determining that the temperature of a coil of an outdoor heat exchanger is greater than a first temperature threshold, controlling a compressor to respond to an ascending frequency instruction and not respond to a descending frequency instruction, and controlling an indoor fan to respond to an ascending speed instruction and not respond to a descending speed instruction, wherein the first temperature threshold is the sum of the saturation temperature and a preset temperature difference for preventing a low-voltage protection switch from starting protection action; or determining that the temperature of the coil of the outdoor heat exchanger is smaller than the first temperature threshold, controlling the compressor to respond to the frequency reduction instruction and not respond to the frequency increase instruction, and controlling the indoor fan to respond to the speed reduction instruction and not respond to the speed increase instruction; or determining that the temperature of the coil of the outdoor heat exchanger is equal to the first temperature threshold, controlling the compressor to maintain the current frequency, and controlling the indoor fan to maintain the current rotating speed.

In some embodiments, the controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner comprises: acquiring the exhaust temperature of a compressor and the temperature of an indoor heat exchanger sensor; obtaining an actual superheat degree according to the exhaust temperature of the compressor and the temperature of the indoor heat exchanger sensor; determining that the difference value between the actual superheat degree and the target superheat degree is larger than a superheat degree threshold value, and controlling the opening degree of the throttling element to increase by using a preset opening degree amplitude; or determining that the difference value between the actual superheat degree and the target superheat degree is smaller than a superheat degree threshold value, and controlling the opening degree of the throttling element to be reduced by a preset opening degree amplitude.

In some embodiments, the control method further comprises: and determining that the temperature of the coil of the target heat exchanger to be cleaned is less than the frosting exit temperature and maintaining the temperature for a first preset time, and controlling the air conditioner to exit the frosting stage.

In some embodiments, after controlling the air conditioner to exit the frosting stage, the control method further includes: controlling the air conditioner to enter the defrosting stage; and determining that the temperature of the coil of the target heat exchanger to be cleaned is greater than the defrosting exit temperature and maintaining for a second preset time, and controlling the air conditioner to exit the target self-cleaning mode.

An embodiment of a second aspect of the present invention provides an air conditioner self-cleaning control device, including: a self-cleaning mode determination module for determining a target self-cleaning mode in response to a self-cleaning instruction, wherein the target self-cleaning mode comprises a frosting phase and a defrosting phase; the target heat exchanger determining module is used for determining a target heat exchanger to be cleaned according to the target self-cleaning mode; the acquisition module is used for acquiring the temperature of the coil of the target heat exchanger to be cleaned; and the control module is used for controlling the fan corresponding to the target heat exchanger to be cleaned to stop running in the frosting stage, controlling the frequency of the compressor and the rotating speed of the running fan according to the temperature of the coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, and controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner.

According to the air conditioner self-cleaning control device provided by the embodiment of the invention, in the frosting stage, the frequency of the compressor, the rotating speed of the running fan and the opening degree of the throttling element are controlled by the control module according to the temperature of the coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, so that the pressure of the refrigerant in the system is dynamically adjusted, the pressure of the refrigerant in the self-cleaning process is ensured to meet the low-pressure requirement, and the problem of triggering low-pressure protection is avoided, therefore, the action of the low-pressure protection switch can be effectively avoided, the normal operation of the self-cleaning function is ensured, and the reliability of the air conditioner is improved.

An embodiment of a third aspect of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to perform the method for controlling self-cleaning of an air conditioner according to the above embodiment.

An embodiment of a fourth aspect of the present invention provides an air conditioner, including: the system comprises a compressor, an indoor heat exchanger, an indoor fan, an outdoor heat exchanger, an outdoor fan and a throttling element; a controller for controlling the frequency of the compressor, the rotation speeds of the indoor fan and the outdoor fan, and the opening degree of the throttling element according to the air conditioner self-cleaning control method of the above embodiment.

According to the air conditioner provided by the embodiment of the invention, in the self-cleaning mode, the controller controls the frequency of the compressor, the rotating speeds of the indoor fan and the outdoor fan and the opening degree of the throttling element by adopting the self-cleaning control method of the air conditioner provided by the embodiment to adjust the refrigerant pressure of the air conditioning system, so that the refrigerant pressure meets the low-pressure requirement in the self-cleaning process, the problem of triggering low-pressure protection is avoided, the action of a low-pressure protection switch can be effectively avoided, the normal operation of a self-cleaning function is ensured, and the reliability of the air conditioner is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

fig. 2 is a refrigerant flow diagram for self-cleaning an indoor heat exchanger according to an embodiment of the present invention;

FIG. 3 is a flow diagram of self-cleaning an indoor heat exchanger according to one embodiment of the present invention;

fig. 4 is a refrigerant flow diagram for self-cleaning an outdoor heat exchanger according to an embodiment of the present invention;

FIG. 5 is a flow diagram for self-cleaning an outdoor heat exchanger according to one embodiment of the present invention;

fig. 6 is a structural view of a self-cleaning control apparatus of an air conditioner according to an embodiment of the present invention;

fig. 7 is a structural view of an air conditioner according to an embodiment of the present invention.

Reference numerals:

an air conditioner self-cleaning control device 10; a self-cleaning mode determination module 11; a target heat exchanger determination module 12; an acquisition module 13; a control module 14;

an air conditioner 20;

a compressor 1; an indoor heat exchanger 2; an indoor fan 3; an outdoor heat exchanger 4; an outdoor fan 5; a throttling element 6; and a controller 7.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

The air conditioner performs functions such as refrigeration/heating circulation or dehumidification through the compressor, the condenser, the expansion valve and the evaporator, can realize the regulation of the indoor environment, and improves the comfort of the indoor environment. The refrigeration cycle includes a series of processes, for example, involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

The compressor compresses a refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas, the discharged refrigerant gas flows into a condenser, the condenser condenses the compressed refrigerant into a liquid state, and heat is released to the surrounding environment through a condensation process.

The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

In the related art, a low-voltage protection switch is generally provided for commercial air conditioning products in consideration of the problems of large capacity and long piping length. However, due to the defect of low pressure of a cooling medium in the air conditioner in the frosting stage of the self-cleaning mode, when the self-cleaning function is applied to commercial air conditioner products, the low-voltage protection switch can be tripped in the self-cleaning process of the air conditioner, so that the products are frequently stopped and protected, and the self-cleaning function cannot be normally performed.

In order to solve the above problems, an embodiment of a first aspect of the present invention provides a self-cleaning control method for an air conditioner, which can ensure that the pressure of a refrigerant in a system meets requirements during a self-cleaning process of the air conditioner with a low-voltage protection switch, and avoid a problem that the self-cleaning cannot be completed due to shutdown caused by the start of the low-voltage protection switch.

The self-cleaning control method of the air conditioner according to the embodiment of the present invention is described with reference to fig. 1, wherein the air conditioner includes a low voltage protection switch, and the control method includes at least steps S1-S4.

Step S1, a target self-cleaning mode is determined in response to the self-cleaning instruction. Wherein the target self-cleaning mode includes a frosting phase and a defrosting phase.

It should be noted that the air conditioner according to the embodiment of the present invention is provided with a low-voltage protection switch, and has a self-cleaning function.

In an embodiment, the self-cleaning modes at least include a self-cleaning mode of the indoor heat exchanger and a self-cleaning mode of the outdoor heat exchanger, and in different self-cleaning modes, the flow direction of the refrigerant is different, and the self-cleaning control mode of the air conditioner is also different, so that the air conditioner needs to determine a target self-cleaning mode to be operated after responding to a self-cleaning instruction to execute a corresponding self-cleaning control strategy.

The user can operate the air conditioner through a remote controller, an air conditioner APP (Application) in the mobile terminal or an operation panel on a body of the air conditioner to start the target self-cleaning mode through languages, gestures and the like, and the air conditioner can respond to a self-cleaning instruction aiming at the air conditioner to control the air conditioner to enter the target self-cleaning mode. Or the air conditioner can be set to periodically start the target self-cleaning mode to control the air conditioner to enter the target self-cleaning mode, namely, the air conditioner responds to a self-cleaning instruction to enter the target self-cleaning mode at intervals, so that the air conditioner can be periodically and automatically started to enter the target self-cleaning mode without manual operation of a user, the air conditioner is cleaned, and the intelligence of the air conditioner is improved.

In the embodiment of the invention, because the air conditioner has the defect of low pressure of a cooling medium in the air conditioner in the frosting stage of the self-cleaning mode, in order to avoid the problem that the self-cleaning function cannot be normally performed due to the fact that a low-pressure protection switch is tripped due to too low pressure in the self-cleaning process, the following steps S2-S4 are executed in the process of the air conditioner running in the target self-cleaning mode, so that the requirement for self-cleaning of the air conditioner is met.

And step S2, determining a target heat exchanger to be cleaned according to the target self-cleaning mode.

In the embodiment, in different self-cleaning modes, the flowing directions of the refrigerants are different, and the self-cleaning control modes of the air conditioner are also different, so that the controller of the air conditioner determines the target heat exchanger to be cleaned according to the target self-cleaning mode to execute a corresponding self-cleaning control strategy, so as to realize the self-cleaning function of the target heat exchanger to be cleaned.

For example, if the target self-cleaning mode is an indoor heat exchanger self-cleaning mode, it may be determined that the target heat exchanger to be cleaned is an indoor heat exchanger; and if the target self-cleaning mode is the self-cleaning mode of the outdoor heat exchanger, determining that the target heat exchanger to be cleaned is the outdoor heat exchanger.

And step S3, acquiring the coil temperature of the heat exchanger to be cleaned.

In the embodiment, based on the fact that the pressure is in direct proportion to the temperature, the lower the temperature is, the lower the pressure is, therefore, in the self-cleaning process of the target heat exchanger to be cleaned, the refrigerant pressure in the air conditioning system in the target self-cleaning mode is judged by monitoring the temperature of the coil of the target heat exchanger to be cleaned in real time.

For example, a temperature sensor may be provided at an appropriate position of the outdoor heat exchanger and the indoor heat exchanger to collect a coil temperature of the outdoor heat exchanger and a coil temperature of the indoor heat exchanger in real time, and each sensor transmits collected data to a controller of the air conditioner, such as an indoor unit controller or an outdoor unit controller, or an independently provided controller. Therefore, when the outdoor heat exchanger serves as a target heat exchanger to be cleaned, the controller of the air conditioner can directly acquire the temperature of the coil pipe corresponding to the outdoor heat exchanger, or when the indoor heat exchanger serves as the target heat exchanger to be cleaned, the controller of the air conditioner can directly acquire the temperature of the coil pipe corresponding to the indoor heat exchanger.

And step S4, in the frosting stage, controlling the fan corresponding to the target heat exchanger to be cleaned to stop running, controlling the frequency of the compressor and the rotating speed of the running fan according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, and controlling the opening degree of the throttling element according to the actual superheat degree of the air conditioner.

In the embodiment, the self-cleaning process of the air conditioner is performed in sequence according to 'refrigeration condensation, refrigeration frosting and heating defrosting', and a low-pressure protection switch is arranged in the air conditioner, so that in the frosting stage, the frequency of a compressor, the rotating speed of an operating fan and the opening of a throttling element are controlled according to a comparison result by comparing the temperature of a coil pipe of a target heat exchanger to be cleaned with the saturation temperature corresponding to the low-pressure protection threshold value of a refrigerant of the low-pressure protection switch, the pressure of the refrigerant in the system is dynamically adjusted, the pressure of the refrigerant meets the low-pressure requirement in the self-cleaning process, the condition of triggering low-pressure protection is avoided, and therefore the low-pressure protection switch can be effectively prevented from acting, the normal operation of the self-cleaning function is ensured, and the reliability of the air conditioner is improved.

Specifically, when the air conditioner operates in a target self-cleaning mode, the air conditioner firstly enters a refrigeration and condensation stage, air is liquefied when meeting cold and generates condensed water on the outer surface of a target heat exchanger to be cleaned, then the air conditioner enters a frosting stage, a controller firstly controls the operation of a compressor frequency, the opening of a throttling element and an operation fan according to an initial set value at the stage, and the temperature of a coil pipe of the target heat exchanger to be cleaned is obtained in real time. The coil temperature of the target heat exchanger to be cleaned is compared with the saturation temperature corresponding to the refrigerant low-pressure protection threshold value of the low-pressure protection switch, the controller controls the frequency of the compressor, the rotating speed of the running fan and the opening degree of the throttling element according to the comparison result, and the refrigerant pressure and the coil temperature in the system are dynamically adjusted, so that the requirement of condensation and frosting of the target heat exchanger to be cleaned is met in the self-cleaning process, the refrigerant pressure meets the low-pressure requirement, the problem of frequent shutdown caused by triggering pressure protection is avoided, smooth completion of the self-cleaning function is ensured, and the reliability of the air conditioner is improved.

According to the air conditioner self-cleaning control method provided by the embodiment of the invention, in the frosting stage, the frequency of the compressor, the rotating speed of the running fan and the opening degree of the throttling element are controlled through the temperature of the coil pipe of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, so that the pressure of the refrigerant in the system is dynamically adjusted, the refrigerant pressure in the self-cleaning process is ensured to meet the low-pressure requirement, the problem of triggering low-pressure protection is avoided, the action of the low-pressure protection switch can be effectively avoided, the normal operation of the self-cleaning function is ensured, and the reliability of the air conditioner is improved.

In some embodiments, the target self-cleaning mode is an indoor heat exchanger self-cleaning mode, that is, the air conditioner enters the indoor heat exchanger self-cleaning mode, and first enters the cooling mode, and frosts through the operation of the cooling mode, at this time, the indoor fan stops operating, so that the indoor heat exchanger frosts, and when a certain condition is met, the frosting is exited and is removed, and finally, the indoor heat exchanger is cleaned. For example, as shown in fig. 2, the refrigerant is discharged from the compressor, enters the four-way valve, enters the outdoor heat exchanger, passes through the throttling element, and then enters the indoor heat exchanger for frosting, so that the dust inside the indoor heat exchanger is wrapped in the frosting, and the effect of cleaning the indoor heat exchanger is achieved.

In order to ensure that the low-pressure in the air conditioning system meets the requirement in the self-cleaning mode of the indoor heat exchanger, the frequency of the compressor and the rotating speed of the outdoor fan need to be controlled. Specifically, if the coil temperature of the indoor heat exchanger is determined to be greater than a first temperature threshold, the temperature of the side of the indoor heat exchanger does not reach the condensation and frost formation temperature, the coil temperature of the indoor heat exchanger is reduced by controlling the compressor to respond to the frequency increasing instruction and not respond to the frequency decreasing instruction, and controlling the outdoor fan to respond to the speed increasing instruction and not respond to the speed decreasing instruction, so that water remaining in the indoor heat exchanger meets cold and frost formation, and dust and dirt in the indoor heat exchanger are wrapped in the frost formation, and the effect of cleaning the indoor heat exchanger is achieved, wherein the first temperature threshold is the sum of the saturation temperature and a preset temperature difference for preventing the low-pressure protection switch from starting protection action; or if the coil temperature of the indoor heat exchanger is determined to be smaller than the first temperature threshold, the pressure in the air conditioning system is too low, the coil temperature of the indoor heat exchanger is raised by controlling the compressor to respond to the frequency reduction instruction and not respond to the frequency increase instruction and controlling the outdoor fan to respond to the speed reduction instruction and not respond to the speed increase instruction, so that the refrigerant pressure in the self-cleaning process meets the requirement, the problem of triggering low-pressure protection is avoided, and the normal operation of the self-cleaning function is ensured; or determining that the coil temperature of the indoor heat exchanger is equal to the first temperature threshold, indicating that the pressure in the air conditioning system meets the requirement and meets the requirement of condensation and frosting, and maintaining the current frequency by controlling the compressor and controlling the outdoor fan to maintain the current rotating speed so as to maintain the coil temperature of the indoor heat exchanger.

In some embodiments, after the frequency of the compressor and the rotation speed of the outdoor fan are adjusted in the above manner, the opening degree of the throttling element is automatically adjusted according to the degree of superheat, so as to ensure that the indoor self-cleaning function is successfully completed. Specifically, the exhaust temperature of a compressor and the sensor temperature of an outdoor heat exchanger are obtained, an actual superheat degree is obtained according to the exhaust temperature of the compressor and the sensor temperature of the outdoor heat exchanger, the difference value between the actual superheat degree and a target superheat degree, namely the superheat degree obtained through calculation of the frequency of the compressor is larger than a superheat degree threshold value, the pressure of a refrigerant passing through a throttling element is low, the opening degree of the throttling element is controlled to be increased by a preset opening degree amplitude, the superheat degree is reduced, the pressure of the refrigerant on the side of the indoor heat exchanger is improved, the problem of triggering low-pressure protection is avoided, and the normal operation of a self; or if the difference value between the actual superheat degree and the target superheat degree is smaller than the superheat degree threshold value, the fact that the temperature of the indoor heat exchanger side does not reach the condensation and frost formation temperature is indicated, the opening degree of the throttling element is controlled to be reduced by the preset opening degree amplitude, the superheat degree is increased, the temperature of the indoor heat exchanger side is reduced, and the effect of frost formation on the indoor heat exchanger side is achieved.

Under the condition of meeting the target self-cleaning mode and the pressure requirement, a superheat threshold value can be preset according to the actual situation, and the superheat threshold value is not limited.

The following describes a self-cleaning process when the target self-cleaning mode is the self-cleaning mode of the indoor heat exchanger with reference to fig. 3, and the specific steps are as follows.

In step S5, the user selects the indoor heat exchanger self-cleaning mode.

In step S6, the air conditioner switches the mode to the indoor heat exchanger self-cleaning mode.

In step S7, the indoor fan is stopped.

And step S8, the frequency of the compressor, the opening of the throttling element and the rotating speed of the outdoor fan are operated according to initial set values.

In step S9, the coil temperature of the indoor heat exchanger and the first temperature threshold are determined.

And step S10, if the temperature of the coil of the indoor heat exchanger is larger than the first temperature threshold value, controlling the compressor to respond to the frequency increasing instruction and not respond to the frequency decreasing instruction, and controlling the outdoor fan to respond to the speed increasing instruction and not respond to the speed decreasing instruction, and executing step S13.

And step S11, if the temperature of the coil pipe of the indoor heat exchanger is equal to the first temperature threshold value, controlling the frequency of the compressor to be unchanged and the rotating speed of the outdoor fan to be unchanged, and executing step S13.

And step S12, if the temperature of the coil of the indoor heat exchanger is less than the first temperature threshold, controlling the compressor to respond to the frequency reduction command and not respond to the frequency increase command, and controlling the outdoor fan to respond to the speed reduction command and not respond to the speed increase command, and executing step S13.

In step S13, the opening degree of the throttling element is controlled in accordance with the degree of superheat.

And step S14, exiting the frosting stage according to the exiting condition.

And step S15, entering a defrosting stage according to the conditions.

And step S16, exiting the self-cleaning mode of the indoor heat exchanger.

In some embodiments, the target self-cleaning mode is an outdoor heat exchanger self-cleaning mode, that is, the air conditioner enters the outdoor heat exchanger self-cleaning mode, and first enters the heating mode, for example, as shown in fig. 4, the refrigerant is discharged from the compressor and then enters the indoor heat exchanger, enters the outdoor heat exchanger through the throttling element after heat exchange, and then enters the four-way valve again and then returns to the compressor, so as to wrap the internal dirt of the outdoor heat exchanger in the accumulated frost, thereby achieving the effect of cleaning the outdoor heat exchanger. And at the moment, the outdoor fan stops running so as to facilitate the frosting of the outdoor heat exchanger, and after a certain condition is met, the frosting is removed and is defrosted, and finally the cleaning of the outdoor heat exchanger is realized.

In order to ensure that the low-pressure in the air conditioning system meets the requirement in the self-cleaning mode of the outdoor heat exchanger, the frequency of the compressor and the rotating speed of the outdoor fan need to be controlled. Specifically, if the temperature of the coil of the outdoor heat exchanger is determined to be greater than a first temperature threshold, the temperature of the side of the outdoor heat exchanger does not reach the condensation and frost formation temperature, the temperature of the coil of the outdoor heat exchanger is reduced by controlling the compressor to respond to the frequency increasing instruction and not respond to the frequency decreasing instruction, and controlling the indoor fan to respond to the speed increasing instruction and not respond to the speed decreasing instruction, so that water remaining in the outdoor heat exchanger meets cold and frost formation, and dust and dirt in the outdoor heat exchanger are wrapped in the frost formation, and the effect of cleaning the outdoor heat exchanger is achieved, wherein the first temperature threshold is the sum of the saturation temperature and a preset temperature difference for preventing the low-pressure protection switch from starting protection action; or if the coil temperature of the outdoor heat exchanger is determined to be less than the first temperature threshold, the pressure in the air conditioning system is too low, the coil temperature of the outdoor heat exchanger is raised by controlling the compressor to respond to the frequency reduction instruction and not respond to the frequency increase instruction and controlling the indoor fan to respond to the speed reduction instruction and not respond to the speed increase instruction, so that the refrigerant pressure in the self-cleaning process meets the requirement, the problem of triggering low-pressure protection is avoided, and the normal operation of the self-cleaning function is ensured; or determining that the coil temperature of the outdoor heat exchanger is equal to the first temperature threshold, indicating that the pressure in the air conditioning system meets the requirement and meets the requirement of condensation and frosting, and maintaining the current frequency by controlling the compressor and controlling the indoor fan to maintain the current rotating speed so as to maintain the coil temperature of the outdoor heat exchanger.

In some embodiments, after the frequency of the compressor and the rotation speed of the outdoor fan are adjusted in the above manner, the opening degree of the throttling element is automatically adjusted according to the degree of superheat, so as to ensure that the indoor self-cleaning function is successfully completed. Specifically, the exhaust temperature of a compressor and the temperature of a sensor of an indoor heat exchanger are obtained, an actual superheat degree is obtained according to the exhaust temperature of the compressor and the temperature of the sensor of the indoor heat exchanger, and the difference value between the actual superheat degree and a target superheat degree is determined to be larger than a superheat degree threshold value, so that the pressure of a refrigerant passing through a throttling element is too low, the opening degree of the throttling element is controlled to be increased by a preset opening degree amplitude value, the superheat degree is reduced, the pressure of the refrigerant on the side of the outdoor heat exchanger is increased, the problem of triggering low-pressure protection is avoided; or if the difference value between the actual superheat degree and the target superheat degree is smaller than the superheat degree threshold value, the fact that the temperature of the outdoor heat exchanger side does not reach the condensation and frost formation temperature is indicated, the opening degree of the throttling element is controlled to be reduced by the preset opening degree amplitude, the superheat degree is increased, the temperature of the indoor heat exchanger side is reduced, and the effect of frost formation on the indoor heat exchanger side is achieved.

The following describes a self-cleaning process when the target self-cleaning mode is the self-cleaning mode of the outdoor heat exchanger with reference to fig. 5, and the specific steps are as follows.

In step S17, the user selects the outdoor heat exchanger self-cleaning mode.

And step S18, switching the air conditioner to the self-cleaning mode of the outdoor heat exchanger.

In step S19, the outdoor fan is stopped.

And step S20, the frequency of the compressor, the opening of the throttling element and the rotating speed of the indoor fan all operate according to initial set values.

Step S21, determining the coil temperature of the outdoor heat exchanger and the first temperature threshold.

And step S22, if the temperature of the coil of the outdoor heat exchanger is larger than the first temperature threshold, controlling the compressor to respond to the frequency increasing instruction and not respond to the frequency decreasing instruction, and controlling the indoor fan to respond to the speed increasing instruction and not respond to the speed decreasing instruction, and executing step S25.

And step S23, if the temperature of the coil pipe of the outdoor heat exchanger is equal to the first temperature threshold value, controlling the frequency of the compressor to be unchanged and the rotating speed of the indoor fan to be unchanged, and executing step S25.

And step S24, if the temperature of the coil of the outdoor heat exchanger is less than the first temperature threshold, controlling the compressor to respond to the frequency reduction command and not respond to the frequency increase command, and controlling the outdoor machine and the indoor machine to respond to the speed reduction command and not respond to the speed increase command, and executing step S25.

In step S25, the opening degree of the throttling element is controlled in accordance with the degree of superheat.

And step S26, exiting the frosting stage according to the exiting condition.

And step S27, entering a defrosting stage according to the conditions.

And step S28, exiting the self-cleaning mode of the outdoor heat exchanger.

In some embodiments, when it is determined that the coil temperature of the heat exchanger to be cleaned is less than the frosting exit temperature and is maintained for the first preset duration, it indicates that the frosting process of the heat exchanger to be cleaned is completed, so that the air conditioner is controlled to exit the frosting stage to enter the frosting stage, and the effect of cleaning the heat exchanger to be cleaned is achieved.

In some embodiments, after the air conditioner is controlled to exit the frosting stage, the air conditioner is controlled to enter the defrosting stage, that is, the air conditioner switches the operation mode to defrost the heat exchanger to be cleaned. For example, the air conditioner is in a self-cleaning mode of an indoor heat exchanger, the air conditioner operates in a cooling mode in a frosting stage, and the air conditioner operates in a heating mode in a defrosting stage; the air conditioner is in an outdoor heat exchanger self-cleaning mode, operates in a heating mode in a frosting stage and operates in a cooling mode in a defrosting stage. And when the coil temperature of the heat exchanger to be cleaned is determined to be greater than the defrosting exit temperature and the second preset time duration is maintained, indicating that the defrosting treatment of the heat exchanger to be cleaned is finished, and controlling the air conditioner to exit the target self-cleaning mode, so that the heat exchanger to be cleaned is cleaned.

In an embodiment of a second aspect of the present invention, an air conditioner self-cleaning control device is provided, as shown in fig. 6, an air conditioner self-cleaning control device 10 includes a self-cleaning mode determining module 11, a target heat exchanger determining module 12, an obtaining module 13, and a control module 14.

The self-cleaning mode determining module 11 is configured to determine a target self-cleaning mode in response to a self-cleaning instruction, where the target self-cleaning mode includes a frosting phase and a defrosting phase; the target heat exchanger determining module 12 is used for determining a target heat exchanger to be cleaned according to the target self-cleaning mode; the acquisition module 13 is used for acquiring the coil temperature of the target heat exchanger to be cleaned; the control module 14 is configured to control, in a frosting stage, a fan corresponding to the target heat exchanger to be cleaned to stop operating, control the frequency of the compressor and the rotation speed of the operating fan according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the refrigerant low-pressure protection threshold of the low-pressure protection switch, and control the opening degree of the throttling element according to the actual superheat degree of the air conditioner.

It should be noted that the specific implementation manner of the air conditioner self-cleaning control device 10 according to the embodiment of the present invention is similar to the specific implementation manner of the air conditioner self-cleaning control method according to any of the above embodiments of the present invention, and please refer to the description of the method for details, which is not repeated herein for reducing redundancy.

According to the air conditioner self-cleaning control device 10 provided by the embodiment of the invention, in the frosting stage, the control module 14 controls the frequency of the compressor, the rotating speed of the running fan and the opening degree of the throttling element according to the coil temperature of the target heat exchanger to be cleaned and the saturation temperature corresponding to the low-pressure protection threshold value of the refrigerant of the low-pressure protection switch, so that the pressure of the refrigerant in the system is dynamically adjusted, the refrigerant pressure in the self-cleaning process is ensured to meet the low-pressure requirement, the problem of triggering low-pressure protection is avoided, the action of the low-pressure protection switch can be effectively avoided, the normal operation of the self-cleaning function is ensured, and the reliability of the air conditioner is improved.

An embodiment of a third aspect of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, provides the self-cleaning control method of the air conditioner according to the above-mentioned embodiment.

A fourth aspect embodiment of the present invention provides an air conditioner, as shown in fig. 7, the air conditioner 20 includes a compressor 1, an indoor heat exchanger 2, an indoor fan 3, an outdoor heat exchanger 4, an outdoor fan 5, a throttling element 6, and a controller 7.

Wherein, the controller 7 is used for controlling the frequency of the compressor 1, the rotating speeds of the indoor fan 3 and the outdoor fan 5 and controlling the opening degree of the throttling element 6 according to the air conditioner self-cleaning control method provided by the above embodiment.

It should be noted that the specific implementation manner of the controller 7 according to the embodiment of the present invention is similar to the specific implementation manner of the air conditioner self-cleaning control method according to any of the above embodiments of the present invention, and please refer to the description of the method for details, which is not described herein again to reduce redundancy.

According to the air conditioner 20 of the embodiment of the invention, in the self-cleaning mode, the controller 7 controls the frequency of the compressor 1, the rotating speeds of the indoor fan 3 and the outdoor fan 5 and the opening degree of the throttling element 6 by adopting the air conditioner self-cleaning control method provided by the embodiment to adjust the refrigerant pressure of the air conditioning system, so that the refrigerant pressure meets the low-pressure requirement in the self-cleaning process, the problem of triggering low-pressure protection is avoided, the action of a low-pressure protection switch can be effectively avoided, the normal operation of the self-cleaning function is ensured, and the reliability of the air conditioner 20 is improved.

In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.