Air conditioner and control method and device thereof, storage medium and computer program product

Abstract

The invention discloses an air conditioner and a control method and device thereof, a storage medium and a computer program product. The method comprises the steps that under the condition that the air conditioner operates in a heating mode, the frequency of a compressor, the rotating direction of an outdoor fan, the rotating speed of the outdoor fan, the pipe temperature of an outdoor heat exchanger and the outdoor environment humidity of the air conditioner are obtained; according to the frequency of the compressor, the rotating direction of the outdoor fan, the rotating speed of the outdoor fan, the outdoor environment humidity of the air conditioner and the pipe temperature of the outdoor heat exchanger, frost layer unevenness parameters of the outdoor heat exchanger are determined; according to the outdoor environment humidity of the air conditioner, the frequency of the compressor and the pipe temperature of the outdoor heat exchanger, frost layer thickness parameters of the outdoor heat exchanger are determined; and according to the frost layer non-uniformity parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, a preset defrosting control strategy is executed. According to the scheme, the frost layer of the outdoor heat exchanger is uniform in the generation process, so that the defrosting time is delayed, and the heating capacity is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and specifically relates to a control method, device, air conditioner, storage medium and computer program product of an air conditioner, and more particularly to a defrost mode of an air conditioner and a control method, device, air conditioner, storage medium and computer program product thereof. Background Art

[0002] Air conditioners (i.e., air conditioners) have become one of the indispensable household appliances. Generally, household air conditioners are used for cooling and / or heating functions. When using the heating function, the air conditioner inevitably absorbs heat from the outside world under the action of the heat pump due to the low external ambient temperature, so that the surface temperature of the outdoor heat exchanger quickly drops below the condensation temperature and the melting point of water, causing the water molecules in the outside air to condense on the outdoor heat exchanger to form a frost layer. As the heating function of the air conditioner continues to operate, the frost layer continues to thicken. After reaching a certain level, the heating capacity of the air conditioner is greatly attenuated, and at this time, the defrosting operation of the air conditioner needs to be performed.

[0003] However, in the related solutions, due to the unevenness of the frost layer on the outdoor heat exchanger of the air conditioner, the air conditioner will be defrosted frequently, which will affect the heating capacity.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The object of the present invention is to provide a control method, device, air conditioner, storage medium and computer program product for an air conditioner, so as to solve the problem in related schemes that the unevenness of the frost layer on the outdoor heat exchanger of the air conditioner will cause the air conditioner to defrost frequently and affect the heating capacity, so as to achieve the effect of delaying the defrosting time and ensuring the heating capacity by making the frost layer of the outdoor heat exchanger more uniform during the generation process.

[0006] The present invention provides a control method for an air conditioner, wherein the air conditioner has an outdoor unit and an indoor unit, wherein the outdoor unit has a compressor, an outdoor heat exchanger and an outdoor fan; the control method for the air conditioner comprises: when the air conditioner is in heating operation, obtaining the frequency of the compressor, obtaining the direction of rotation of the outdoor fan and the rotation speed of the outdoor fan, obtaining the pipe temperature of the outdoor heat exchanger, and obtaining the outdoor ambient humidity of the air conditioner; determining a frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of rotation of the outdoor fan, the rotation speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger; determining a frost layer thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger; and executing a preset defrosting control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger.

[0007] In some embodiments, determining the frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the tube temperature of the outdoor heat exchanger includes: calculating the frost layer unevenness parameter of the outdoor heat exchanger according to the following formula according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the tube temperature of the outdoor heat exchanger:

[0008]

[0009] Wherein, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the coefficient used to characterize the direction of the outdoor fan, R represents the speed of the outdoor fan, and R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, and Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the integration time;

[0010] And / or, determining the frost thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger, including: calculating the frost thickness parameter of the outdoor heat exchanger according to the following formula according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger:

[0011]

[0012] Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent integration time.

[0013] In some embodiments, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels; the level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels; according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, a preset defrost control strategy is executed, including: determining the level of the frost layer unevenness parameter of the outdoor heat exchanger in the level range of the frost layer unevenness parameter of the outdoor heat exchanger, recorded as the current frost layer unevenness level of the outdoor heat exchanger; determining the level of the outdoor heat exchanger The level of the frost thickness parameter of the outdoor heat exchanger in the level range of the frost thickness parameter of the outdoor heat exchanger is recorded as the current frost thickness level of the outdoor heat exchanger; according to the correspondence between different frost thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategies, the defrost control strategy in the preset defrost control strategy corresponding to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger is determined, and it is recorded as the current defrost control strategy of the air conditioner; the air conditioner is controlled to execute the current defrost control strategy of the air conditioner.

[0014] In some embodiments, there are two or more frost layer unevenness levels, including: a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence; there are two or more frost layer thickness levels, including: a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence; according to the correspondence between different frost layer thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategy, the preset defrost control strategy corresponding to the outdoor heat exchanger is determined. The defrost control strategy corresponding to the current frost thickness level of the outdoor heat exchanger under the current frost unevenness level is recorded as the current defrost control strategy of the air conditioner, including: if the current frost unevenness level of the outdoor heat exchanger is determined to be the first frost unevenness level, then: when the current frost thickness level of the outdoor heat exchanger is determined to be the first frost thickness level or the second frost thickness level or the third frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level or the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined A strategy for controlling the air conditioner to enter a preset reverse cycle defrost program; if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the second frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level In the case where the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a first set ratio; in the case where the current frost thickness level of the outdoor heat exchanger is determined to be the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be the strategy of controlling the air conditioner to enter a preset reverse cycle defrost program;If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the third frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be A strategy for changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, determining that the current defrost control strategy of the air conditioner is a strategy for changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, determining that the current defrost control strategy of the air conditioner is a strategy for controlling the air conditioner to enter a preset reverse cycle defrost program; if it is determined that the current frost unevenness level of the outdoor heat exchanger is the fourth Frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio. The strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio is determined; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third set ratio, and reducing the frequency of the compressor by a fourth set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third set ratio, and reducing the frequency of the compressor by a fifth set ratio;If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fifth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio. The strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fourth setting ratio; when the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fifth setting ratio; when the current frost thickness level of the outdoor heat exchanger is determined to be the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a sixth setting ratio; wherein the first setting ratio, the second setting ratio, the third setting ratio, the fourth setting ratio, the fifth setting ratio, and the sixth setting ratio increase in sequence. ;

[0015] In some embodiments, it also includes: obtaining the set temperature of the air conditioner, obtaining the indoor ambient temperature of the air conditioner, and obtaining the air outlet temperature of the indoor unit; determining the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit; determining the defrost strategy statistical value based on heating demand of the air conditioner according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner; according to the correspondence between different predetermined defrost strategy statistical values ​​and different frost control strategies in the preset frost control strategy, determining the frost control strategy in the preset frost control strategy corresponding to the defrost strategy statistical value based on heating demand of the air conditioner, recorded as the current frost control strategy of the air conditioner; controlling the air conditioner to execute the current frost control strategy of the air conditioner.

[0016] In some implementations, determining the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit includes: calculating the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit according to the following formula:

[0017] DHT=P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -T Nor );

[0018] Wherein, DHT represents the heating demand parameter of the air conditioner, P_s represents the preset basic starting parameter, T_i represents the indoor ambient temperature of the air conditioner, T_o represents the outlet air temperature of the indoor unit, T_s represents the set temperature of the air conditioner, T_Nor represents the preset basic temperature, W1 represents the weight coefficient of the indoor ambient temperature T_i of the air conditioner, W2 represents the weight coefficient of the outlet air temperature of the indoor unit, and W3 represents the weight coefficient of the set temperature of the air conditioner;

[0019] And / or, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels; the level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels; the level range of the heating demand degree parameter of the air conditioner includes: more than two heating demand degree levels; according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, the statistical value of the defrost strategy based on the heating demand of the air conditioner is determined, including: according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, the statistical value of the defrost strategy based on the heating demand of the air conditioner is calculated according to the following formula:

[0020] SN = Nu_Jr's level + Th_Jr's level - DHT's level / 2;

[0021] Among them, SN represents the statistical value of the defrost strategy of the air conditioner based on the heating demand, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, Th_Jr represents the frost layer thickness parameter of the outdoor heat exchanger, and DHT represents the heating demand degree parameter of the air conditioner; if the level / 2 of DHT is a decimal, it is rounded up.

[0022] In some embodiments, the range of the defrost strategy statistical value based on heating demand of the air conditioner includes: a first statistical value, a second statistical value, a third statistical value, a fourth statistical value, a fifth statistical value, a sixth statistical value, a seventh statistical value, and an eighth statistical value that increase in sequence; according to the correspondence between different predetermined defrost strategy statistical values ​​and different frost control strategies in the preset frost control strategy, the frost control strategy corresponding to the defrost strategy statistical value based on heating demand of the air conditioner in the preset frost control strategy is determined, which is recorded as the current frost control strategy of the air conditioner, including: if it is determined that the defrost strategy statistical value based on heating demand of the air conditioner is the first statistical value, the second statistical value, or the third statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy that does not perform any operation; if it is determined that the defrost strategy statistical value based on heating demand of the air conditioner is the fourth statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy that changes the direction of the outdoor fan and increases the speed of the outdoor fan. The strategy of increasing the first set ratio and reducing the frequency of the compressor by the first set ratio; if the statistical value of the defrost strategy based on heating demand of the air conditioner is determined to be the fifth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by the second set ratio, and reducing the frequency of the compressor by the third set ratio; if the statistical value of the defrost strategy based on heating demand of the air conditioner is determined to be the sixth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by the third set ratio, and reducing the frequency of the compressor by the fifth set ratio; wherein the first set ratio, the second set ratio, the third set ratio, and the fifth set ratio increase in sequence; if the statistical value of the defrost strategy based on heating demand of the air conditioner is determined to be the seventh statistical value or the eighth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0023] Matching the above method, the present invention provides a control device for an air conditioner on the other hand, the air conditioner has an outdoor unit and an indoor unit, the outdoor unit has a compressor, an outdoor heat exchanger and an outdoor fan; the control device for the air conditioner includes: an acquisition unit, configured to acquire the frequency of the compressor, the direction of the outdoor fan and the rotation speed of the outdoor fan, the pipe temperature of the outdoor heat exchanger, and the outdoor ambient humidity of the air conditioner when the air conditioner is in heating operation; a control unit, configured to determine the frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the rotation speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger; the control unit is further configured to determine the frost layer thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger; the control unit is further configured to execute a preset defrosting control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger.

[0024] In some embodiments, the control unit determines the frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger, including: calculating the frost layer unevenness parameter of the outdoor heat exchanger according to the following formula according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger:

[0025]

[0026] Wherein, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the coefficient used to characterize the direction of the outdoor fan, R represents the speed of the outdoor fan, and R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, and Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the integration time;

[0027] And / or, the control unit determines the frost thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger, including: calculating the frost thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger according to the following formula:

[0028]

[0029] Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent integration time.

[0030] In some embodiments, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels; the level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels; the control unit executes a preset defrost control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, including: determining the level of the frost layer unevenness parameter of the outdoor heat exchanger in the level range of the frost layer unevenness parameter of the outdoor heat exchanger, recorded as the current frost layer unevenness level of the outdoor heat exchanger; determining the The level of the frost thickness parameter of the outdoor heat exchanger within the level range of the frost thickness parameter of the outdoor heat exchanger is recorded as the current frost thickness level of the outdoor heat exchanger; according to the correspondence between different frost thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategies, the defrost control strategy in the preset defrost control strategy corresponding to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger is determined, and recorded as the current defrost control strategy of the air conditioner; the air conditioner is controlled to execute the current defrost control strategy of the air conditioner.

[0031] In some embodiments, there are two or more frost layer unevenness levels, including: a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence; there are two or more frost layer thickness levels, including: a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence; the control unit determines the preset defrost control strategy corresponding to the room temperature according to the correspondence between different frost layer thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategy. The defrost control strategy corresponding to the current frost thickness level of the outdoor heat exchanger under the current frost unevenness level of the outdoor heat exchanger is recorded as the current defrost control strategy of the air conditioner, including: if the current frost unevenness level of the outdoor heat exchanger is determined to be the first frost unevenness level, then: when the current frost thickness level of the outdoor heat exchanger is determined to be the first frost thickness level or the second frost thickness level or the third frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level or the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation. The control strategy is a strategy for controlling the air conditioner to enter a preset reverse cycle defrost program; if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the second frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, etc. In the case of the fourth frost thickness level of the outdoor heat exchanger, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; in the case of determining that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a first set ratio; in the case of determining that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program;If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the third frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be A strategy for changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, determining that the current defrost control strategy of the air conditioner is a strategy for changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, determining that the current defrost control strategy of the air conditioner is a strategy for controlling the air conditioner to enter a preset reverse cycle defrost program; if it is determined that the current frost unevenness level of the outdoor heat exchanger is the fourth Frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio. The strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio is determined; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third set ratio, and reducing the frequency of the compressor by a fourth set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third set ratio, and reducing the frequency of the compressor by a fifth set ratio;If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fifth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio. The strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fourth setting ratio; when the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fifth setting ratio; when the current frost thickness level of the outdoor heat exchanger is determined to be the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a sixth setting ratio; wherein the first setting ratio, the second setting ratio, the third setting ratio, the fourth setting ratio, the fifth setting ratio, and the sixth setting ratio increase in sequence. ;

[0032] In some embodiments, it also includes: the acquisition unit is further configured to acquire the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the outlet air temperature of the indoor unit; the control unit is further configured to determine the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the outlet air temperature of the indoor unit; the control unit is further configured to determine the defrost strategy statistic based on heating demand of the air conditioner according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner; the control unit is further configured to determine the frost control strategy corresponding to the defrost strategy statistic based on heating demand of the air conditioner in the preset frost control strategy according to the correspondence between different predetermined defrost strategy statistics and different frost control strategies in the preset frost control strategy, recorded as the current frost control strategy of the air conditioner; the control unit is further configured to control the air conditioner to execute the current frost control strategy of the air conditioner.

[0033] In some embodiments, the control unit determines the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit, including: calculating the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit according to the following company:

[0034] DHT=P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -T Nor );

[0035] Wherein, DHT represents the heating demand parameter of the air conditioner, P_s represents the preset basic starting parameter, T_i represents the indoor ambient temperature of the air conditioner, T_o represents the outlet air temperature of the indoor unit, T_s represents the set temperature of the air conditioner, T_Nor represents the preset basic temperature, W1 represents the weight coefficient of the indoor ambient temperature T_i of the air conditioner, W2 represents the weight coefficient of the outlet air temperature of the indoor unit, and W3 represents the weight coefficient of the set temperature of the air conditioner;

[0036] And / or, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels; the level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels; the level range of the heating demand degree parameter of the air conditioner includes: more than two heating demand degree levels; the control unit determines the defrost strategy statistical value based on heating demand of the air conditioner according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, including: according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, the defrost strategy statistical value based on heating demand of the air conditioner is calculated according to the following formula: SN=Nu_Jr level+Th_Jr level-DHT level / 2;

[0037] Among them, SN represents the statistical value of the defrost strategy of the air conditioner based on the heating demand, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, Th_Jr represents the frost layer thickness parameter of the outdoor heat exchanger, and DHT represents the heating demand degree parameter of the air conditioner; if the level / 2 of DHT is a decimal, it is rounded up.

[0038] In some embodiments, the range of the defrost strategy statistical value based on heating demand of the air conditioner includes: a first statistical value, a second statistical value, a third statistical value, a fourth statistical value, a fifth statistical value, a sixth statistical value, a seventh statistical value, and an eighth statistical value that increase in sequence; the control unit determines the frost control strategy corresponding to the defrost strategy statistical value based on heating demand of the air conditioner in the preset frost control strategy according to the correspondence between different predetermined defrost strategy statistical values ​​and different frost control strategies in the preset frost control strategy, recorded as the current frost control strategy of the air conditioner, including: if it is determined that the defrost strategy statistical value based on heating demand of the air conditioner is the first statistical value, the second statistical value, or the third statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy that does not perform any operation; if it is determined that the defrost strategy statistical value based on heating demand of the air conditioner is the fourth statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy that changes the direction of the outdoor fan, increases the outdoor fan The strategy of increasing the speed of the machine by a first set ratio and reducing the frequency of the compressor by a first set ratio is adopted; if it is determined that the statistical value of the defrost strategy based on heating demand of the air conditioner is a fifth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; if it is determined that the statistical value of the defrost strategy based on heating demand of the air conditioner is a sixth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third set ratio, and reducing the frequency of the compressor by a fifth set ratio; wherein the first set ratio, the second set ratio, the third set ratio, and the fifth set ratio increase in sequence; if it is determined that the statistical value of the defrost strategy based on heating demand of the air conditioner is a seventh statistical value or an eighth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0039] Matching the above device, the present invention provides an air conditioner on another aspect, including: the control device of the air conditioner described above.

[0040] Matching the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the air conditioner control method described above.

[0041] Matching the above method, the present invention further provides a computer program product on the other hand, including a computer program, which implements the steps of the above air conditioner control method when executed by a processor.

[0042] Therefore, the scheme of the present invention determines the frost layer unevenness parameter (such as unevenness parameter Nu_Jr) of the outdoor heat exchanger according to the direction and speed of the outdoor fan, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger when the air conditioner is in heating operation; determines the frost layer thickness parameter (such as frost layer thickness parameter Th_Jr) of the outdoor heat exchanger according to the outdoor ambient humidity, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger; and executes a preset extended defrost time control strategy according to the frost layer unevenness parameter and the frost layer thickness parameter of the outdoor heat exchanger, thereby ensuring the continuous and efficient operation of the air conditioner in the heating mode and improving the user experience by delaying the defrost time.

[0043] Furthermore, the scheme of the present invention also determines the user heating demand degree parameter of the air conditioner (such as the user heating demand degree parameter DHT) according to the user set temperature, the indoor ambient temperature, and the indoor unit outlet air temperature; according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the user heating demand degree parameter of the air conditioner, a weighted statistical method is used to determine the defrost strategy statistics based on the user heating demand (such as the defrost strategy statistics SN based on the user heating demand); according to the defrost strategy statistics based on the user heating demand, a preset control strategy for optimizing the uniformity of the frost layer of the outdoor heat exchanger is executed, and by optimizing the uniformity of the frost layer of the outdoor heat exchanger, the air conditioner is reduced from frequently entering the defrost state, thereby improving the overall defrost efficiency. Therefore, by making the frost layer of the outdoor heat exchanger more uniform during the generation process, the defrost time is delayed and the heating capacity is guaranteed.

[0044] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for controlling an air conditioner of the present invention;

[0046] Figure 2 It is a flow chart of an embodiment of executing a preset defrosting control strategy according to the frost layer unevenness parameter and the frost layer thickness parameter of the outdoor heat exchanger in the method of the present invention;

[0047] Figure 3 A flow chart of an embodiment of the method of the present invention for executing a preset frost control strategy in combination with the heating demand degree parameter of the air conditioner;

[0048] Figure 4 A schematic structural diagram of an embodiment of a control device for an air conditioner of the present invention;

[0049] Figure 5 A schematic diagram of a control framework of an embodiment of a defrost control method of the present invention;

[0050] Figure 6 A schematic diagram of a control framework of an embodiment of a frost layer control method of the present invention;

[0051] Figure 7 It is a schematic diagram of the execution strategy of the present invention under different frost layer thickness levels when the unevenness is level one;

[0052] Figure 8 It is a schematic diagram of the execution strategy of the present invention under different frost layer thickness levels when the unevenness is level 2;

[0053] Fig. 9 It is a schematic diagram of the execution strategy of the present invention under different frost layer thickness levels when the unevenness is level three;

[0054] Fig.10 It is a schematic diagram of the execution strategy of the present invention under different frost layer thickness levels when the unevenness is level four;

[0055] Fig.11 It is a schematic diagram of the execution strategy of the present invention under different frost layer thickness levels when the unevenness is level five;

[0056] Fig.12 It is a schematic diagram of the actuator control strategy based on the defrost strategy statistics SN of the present invention.

[0057] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0058] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0060] Considering that the defrosting methods of air conditioners in related schemes are mainly divided into four types:

[0061] 1) Shutdown and defrost: The air conditioner will automatically stop working when the indoor ambient temperature reaches the set temperature, and use the indoor temperature to naturally defrost the outdoor heat exchanger. This method is simple, but the defrosting time is long, and the indoor temperature will drop during the defrosting process, affecting the comfort.

[0062] 2) Hot gas defrosting: By reversing the direction of the compressor, the hot gas originally used for heating is directed to the outdoor heat exchanger, making the outdoor heat exchanger hot to achieve defrosting. This method defrosts quickly, but consumes extra electricity and affects the room temperature in a short period of time.

[0063] 3) Electric heating defrosting: Install an electric heating element on the outdoor heat exchanger, and defrost by heating the outdoor heat exchanger with electricity. This method has a fast defrosting speed, but high energy consumption, and long-term use may affect the life of the electric heating element.

[0064] 4) Mixed defrosting: Combine two or more of the above methods and select the most appropriate defrosting strategy according to actual needs. For example, when the outdoor temperature is high, you can use shutdown defrosting; when the outdoor temperature is low, you can use hot gas defrosting or electric heating defrosting.

[0065] Due to the defrosting speed and cost restrictions, hot gas defrosting (i.e. reverse cycle defrosting) is the most commonly used method. The main reasons include: fast defrosting speed: it can quickly melt the frost layer and reduce the defrosting time; relatively low energy consumption: compared with electric heating defrosting, reverse cycle defrosting is more energy-efficient; mature technology: reverse cycle defrosting technology is quite mature and widely used in various household air conditioners. In other words, hot gas defrosting (reverse cycle defrosting) has become the most commonly used defrosting method due to its fast defrosting speed, low energy consumption and mature technology, and is widely used in household air conditioners.

[0066] The defrosting strategies in the relevant schemes are mainly for reverse cycle defrosting (i.e., reverse cycle defrosting), and are based on different time strategies or strategies based on ambient temperature and pipe temperature. That is, the defrosting strategies in the relevant schemes are mainly based on reverse cycle defrosting, and adopt different time strategies or ambient temperature and pipe temperature control. There is no corresponding strategy control for the frosting process and the frost layer state.

[0067] By studying the frosting process of the outdoor heat exchanger and the airflow direction of the outdoor fan, it was found that in the early stage of frosting of the outdoor heat exchanger, due to the action of the outdoor unit axial flow fan, the airflow flows from the outside to the inside of the outdoor unit. Under the action of the airflow kinetic energy, in the condensation stage, the water droplets are more inclined to the inside of the outdoor heat exchanger. In the frosting process of the outdoor heat exchanger, due to the bias during condensation, the frost layer of the outdoor heat exchanger is thicker on the inside and thinner on the outside at the beginning of frosting. In other words, the study found that the airflow flows from the outside to the inside in the early stage of frosting of the outdoor heat exchanger, resulting in a thicker frost layer on the inside and thinner on the outside of the outdoor heat exchanger.

[0068] The relevant scheme adopts the thin frost quick-dissolving technology, that is, defrosting in the thin frost state. During the defrosting process of the outdoor heat exchanger, the defrosting state is recorded by video. The frost layer on the outside of the outdoor heat exchanger melts first and the inside melts slowly. Due to the unevenness of the frost layer on the outdoor heat exchanger, the air conditioner enters the defrosting state many times, and the defrosting efficiency is low. In other words, by monitoring the defrosting state through video, it is found that the frost layer on the outside of the heat exchanger melts first and the inside melts slowly, causing the air conditioner to enter the defrosting state many times, and the defrosting efficiency is low.

[0069] Therefore, the scheme of the present invention proposes a control method for an air conditioner, specifically a defrost mode of an air conditioner and a control method thereof, which can make the frost layer of an outdoor heat exchanger more uniform during the formation process, thereby delaying the defrost time and ensuring the heating capacity.

[0070] According to an embodiment of the present invention, a method for controlling an air conditioner is provided. Figure 1 The flow chart of an embodiment of the method of the present invention is shown in FIG. The air conditioner comprises an outdoor unit and an indoor unit, the outdoor unit comprises a compressor, an outdoor heat exchanger and an outdoor fan, and the indoor unit comprises an air outlet; in the scheme of the present invention, Figure 1 As shown, the control method of the air conditioner includes: steps S110 to S140.

[0071] At step S110, when the air conditioner is in heating operation, the frequency of the compressor (such as the compressor frequency Fre) is obtained, the direction of the outdoor fan and the speed of the outdoor fan (such as the forward or reverse direction coefficient A and the speed R of the outdoor fan) are obtained, the pipe temperature of the outdoor heat exchanger (such as the pipe temperature Ept of the outdoor heat exchanger) is obtained, and the outdoor ambient humidity of the air conditioner (such as the outdoor ambient humidity Hum) is obtained.

[0072] At step S120, the frost layer unevenness parameter (such as unevenness parameter Nu_Jr) of the outdoor heat exchanger is determined according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger; wherein, the frost layer unevenness of the outdoor heat exchanger refers to the inconsistent frost thickness on the outside and inside of the frost layer of the outdoor heat exchanger, for example: due to the air flow from the outside to the inside at the initial stage of frosting of the outdoor heat exchanger, the frost layer of the outdoor heat exchanger is thicker on the inside and thinner on the outside.

[0073] In step S130, a frost thickness parameter of the outdoor heat exchanger (such as frost thickness parameter Th_Jr) is determined according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger.

[0074] At step S140, a preset defrost control strategy is executed according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, that is, a preset extended defrost time control strategy is executed to: control the normal operation of the air conditioner when defrosting is not required, so that the air conditioner can operate normally in the heating mode to ensure indoor comfort; when there is frost and the corresponding frost layer thickness and frost layer unevenness are not reached, the direction and speed of the outdoor fan and the frequency of the compressor are controlled to delay the defrost time, extend the heating time, and ensure indoor comfort as much as possible; when there is frost and the frost layer thickness and frost layer unevenness reach a certain standard, reverse cycle defrost is performed, that is, reverse cycle defrost is performed when a uniform thin frost state is achieved to improve the performance of the outdoor heat exchanger, thereby ensuring the continuous and efficient operation of the air conditioner in the heating mode and improving the user experience.

[0075] The system structure framework of a control scheme for the defrost mode of an air conditioner proposed in the solution of the present invention mainly includes: a data acquisition module, a central processing module and an actuator module. Among them, the data acquisition module: includes an outdoor environment humidity sensor, an outdoor environment temperature sensor, a heat exchanger copper tube temperature sensor, etc. The collected data obtained by the data acquisition module mainly include: external environment humidity, external environment temperature, copper tube temperature of the outdoor heat exchanger, compressor frequency, etc. Central processing module: for the collected data obtained by the data acquisition module, normalization processing is performed according to the data model formed by the laboratory measurement results to judge the frosting characteristics of the outdoor heat exchanger. When the frosting characteristics of the outdoor heat exchanger meet different preset conditions, different preset instructions are issued to the actuator module to perform different preset operations. Actuator module: includes a compressor and indoor and outdoor fans. When the actuator module receives the instruction from the central processing module, it adjusts the compressor frequency, indoor and outdoor fan speed and steering parameters. Specifically, Figure 5 FIG. 1 is a schematic diagram of a control framework of an embodiment of the defrosting control method of the present invention. Figure 5 As shown, the system structure framework of a control scheme for the defrost mode of an air conditioner proposed by the solution of the present invention includes: a sensor module, a central processing unit module, an execution module, and corresponding defrost judgment conditions and reverse cycle defrost commands.

[0076] The collected data obtained by the sensor module refers to the natural environment variables, indoor environment variables, and system variables of the air conditioner itself that can be monitored by the air conditioner. The sensor module specifically refers to a temperature sensor, a humidity sensor, etc. Furthermore, the collected data obtained by the sensor module includes external environment temperature (outdoor environment temperature) variables, external copper tube temperature (tube temperature of the outdoor heat exchanger) variables, and external environment humidity (outdoor environment humidity). The sensor module transmits the obtained collected data to the central processing unit module for data processing, wherein the sensor module performs data collection at a set frequency and transmits the obtained collected data to the central processing unit module at a set frequency.

[0077] In addition to data collection by the sensor module, the central processor obtains the air conditioner operation data, including: compressor operation frequency, indoor fan direction and speed data, outdoor fan direction and speed data. The air conditioner operation data is directly obtained by the central processor and processed accordingly.

[0078] The control scheme for the defrost mode of an air conditioner proposed in the solution of the present invention is to establish a frost model through the existing sensor monitoring data of the air conditioner after the user turns on the heating, judge the frost state and the uniformity of the frost layer on the outdoor heat exchanger fins according to the frost model, execute the control strategy of the steering of the axial flow fan of the outdoor unit at different time intervals, and perform reverse cycle defrost when a uniform thin frost state is achieved, thereby reducing the number of defrost times and the defrost time, thereby improving the heating performance of the air conditioner.

[0079] In some embodiments, the step S120 determines the frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the tube temperature of the outdoor heat exchanger, including: calculating the frost layer unevenness parameter of the outdoor heat exchanger according to the following formula according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the tube temperature of the outdoor heat exchanger:

[0080]

[0081] Wherein, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the coefficient used to characterize the direction of the outdoor fan, R represents the speed of the outdoor fan, and R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, and Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the integration time;

[0082] In some embodiments, determining the frost thickness parameter of the outdoor heat exchanger according to the outdoor environment humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger in step S130 includes: calculating the frost thickness parameter of the outdoor heat exchanger according to the outdoor environment humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger according to the following formula:

[0083]

[0084] Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent integration time.

[0085] Specifically, in the scheme of the present invention, see Figure 5 In the example shown, the central processing module processes the data transmitted by the sensor module and the data obtained by itself, and compares the processing results with the preset instructions, and issues relevant instructions to the actuator module. Furthermore, the central processing module processes the data using at least one of neural network algorithm processing, fuzzy control processing, genetic algorithm processing, and PID (i.e. proportional-integral-differential) processing to determine the unevenness of frosting and the thickness of frosting, and then compares the unevenness of frosting and the thickness of frosting with the preset database, and issues a preset instruction to the actuator module after reaching the corresponding value.

[0086] In the scheme of the present invention, PID control is used for data processing, wherein integral (I) processing is performed on the direction and speed of the outdoor fan, integral (I) and differential (D) processing are performed on the outdoor ambient humidity, proportional (I) processing is performed on the compressor frequency, and differential (D) processing is performed on the tube temperature of the outdoor heat exchanger. According to the above parameters and processing methods, the parameters of frost unevenness and frost thickness are obtained, compared with the database, and corresponding instructions are issued to the actuator module.

[0087] Specifically, the speed and direction of the outdoor fan are represented, where the forward or reverse direction coefficient of the outdoor fan is A, and the speed R is integrated over time; the outdoor ambient humidity Hum is integrated and differentiated over time, where the integral processing result is used to judge the thickness of the frost layer, and the differential processing result is used to judge the unevenness of the frost layer; the compressor frequency Fre can be used as one of the representations of the frost layer growth rate, and is used to judge the unevenness and thickness of the frost layer, and the frequency Fre_Max is the maximum operating frequency of the compressor; the tube temperature Ept of the outdoor heat exchanger is differentiated on a time scale, where when the tube temperature of the outdoor heat exchanger is lower than T, its coefficient C changes accordingly.

[0088] The non-uniformity parameter Nu_Jr is expressed using formula (1):

[0089]

[0090] Among them, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the steering coefficient of the outdoor fan, R represents the speed of the outdoor fan, and R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity; Fre represents the compressor frequency, and Fre_Max represents the maximum frequency of the compressor; C represents the pipe temperature coefficient of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the starting point and end point of a preset period of time, such as the ratio of the speed R of the outdoor fan to the maximum speed R_Max of the outdoor fan is integrated over a period of time from t2 to t1, and the ratio of the compressor frequency Fre to the maximum frequency Fre_Max of the compressor is integrated over a period of time from t2 to t1. Among them, the A value is 1 when rotating forward and -1 when rotating reversely, and the C value is 2.6 times the normal value when the pipe temperature Ept of the outdoor heat exchanger is lower than the set temperature value T.

[0091] Formula (2) is used to express the frost thickness parameter Th_Jr:

[0092]

[0093] Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity; Fre represents the compressor frequency, Fre_Max represents the maximum frequency of the compressor; C represents the pipe temperature coefficient of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the starting point and end point of a preset period of time, such as the ratio of the speed R of the outdoor fan to the maximum speed R_Max of the outdoor fan is integrated over a period of time from t2 to t1, and the ratio of the compressor frequency Fre to the maximum frequency Fre_Max of the compressor is integrated over a period of time from t2 to t1. Among them, the C value is 2.6 times the normal value when the pipe temperature Ept of the outdoor heat exchanger is lower than T.

[0094] In the scheme of the present invention, PID processing is performed on the collected data obtained by the sensor module to determine the unevenness of frost and the thickness of frost, and then the unevenness of frost and the thickness of frost are compared with the preset database. After reaching the corresponding numerical value, a preset instruction is issued to the actuator module to execute the control strategy of the steering of the axial flow fan of the outdoor unit at different time intervals, and reverse cycle defrosting is performed when a uniform thin frost state is achieved, thereby reducing the number of defrosting times and the defrosting time, thereby improving the heating performance of the air conditioner.

[0095] In some embodiments, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels, such as a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence. The level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels, such as a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence.

[0096] For the specific process of executing the preset defrost control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger in step S140, please refer to the following exemplary description.

[0097] Combine the following Figure 2 The method of the present invention is shown as a flow chart of an embodiment of executing a preset defrost control strategy according to the frost layer unevenness parameter and the frost layer thickness parameter of the outdoor heat exchanger, further illustrating the specific process of executing the preset defrost control strategy according to the frost layer unevenness parameter and the frost layer thickness parameter of the outdoor heat exchanger in step S140, including: steps S210 to S240.

[0098] Step S210, determining the level of the frost layer unevenness parameter of the outdoor heat exchanger within the level range of the frost layer unevenness parameter of the outdoor heat exchanger, and recording it as the current frost layer unevenness level of the outdoor heat exchanger.

[0099] Step S220, determining the level of the frost thickness parameter of the outdoor heat exchanger within the level range of the frost thickness parameter of the outdoor heat exchanger, and recording it as the current frost thickness level of the outdoor heat exchanger.

[0100] Step S230, based on the correspondence between different frost layer thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategies, determine the defrost control strategy in the preset defrost control strategy that corresponds to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger, and record it as the current defrost control strategy of the air conditioner.

[0101] Step S240, controlling the air conditioner to execute the current defrosting control strategy of the air conditioner. In the solution of the present invention, the frost layer non-uniformity parameter Nu_Jr of the outdoor heat exchanger is graded and represented as shown in Table 1 according to its numerical calculation result.

[0102] Table 1

[0103]

[0104] In Table 1, D0, D1, D2, and D3 represent different interval thresholds of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger. Levels I to V of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger indicate that the degree of frost layer unevenness of the outdoor heat exchanger is getting deeper and deeper.

[0105] The frost thickness parameter Th_Jr of the outdoor heat exchanger is graded according to its numerical calculation results as shown in Table 2.

[0106] Table 2

[0107]

[0108] In Table 2, T0, T1, T2, and T3 represent different interval thresholds of the frost thickness parameter Th_Jr of the outdoor heat exchanger. The levels i to v of the frost thickness parameter Th_Jr of the outdoor heat exchanger indicate that the frost thickness of the outdoor heat exchanger continues to thicken. When the frost unevenness parameter Nu_Jr of the outdoor heat exchanger is at level I during a certain period of time (t0-t), it indicates that the frost layer of the outdoor heat exchanger is uniform.

[0109] In the scheme of the present invention, by collecting data such as external environmental humidity, external environmental temperature, outdoor heat exchanger copper tube temperature, compressor frequency, etc., based on the unevenness of the frost layer, the monitoring data is sent to the central processing unit module for processing and state judgment is performed according to the formula, wherein the state judgment is integrated into two variables, namely, frost layer thickness and frost layer unevenness. The central processing unit module compares the frost layer thickness and frost layer unevenness data with the data rate parameter, sends the execution instruction to the actuator module, and performs corresponding operations, thereby solving the problem of long defrosting time caused by frost layer unevenness, thereby extending the heating time.

[0110] In some embodiments, the two or more frost layer unevenness levels include: a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence. The two or more frost layer thickness levels include: a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence. The preset defrost control strategy includes at least one of the following: a strategy of not performing any operation, a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan, a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio (such as 10%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio (such as 15%), and reducing the frequency of the compressor by a first set ratio (such as 10%), a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program, a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio (such as 10%), and reducing the frequency of the compressor by a first set ratio (such as 10%), and changing the direction of the outdoor fan. The strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%), the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fourth setting ratio (such as 40%), the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%), the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a sixth setting ratio (such as 80%).

[0111] In step S230, according to the correspondence between different frost layer thickness levels under different frost layer unevenness levels and different defrost control strategies in the preset defrost control strategies, the defrost control strategy corresponding to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger in the preset defrost control strategy is determined, which is recorded as the current defrost control strategy of the air conditioner, including any of the following determination situations of the defrost control strategy:

[0112] Determination scenario of the first defrost control strategy: If the current frost layer unevenness level of the outdoor heat exchanger is determined to be the first frost layer unevenness level, then: when the current frost layer thickness level of the outdoor heat exchanger is determined to be the first frost layer thickness level or the second frost layer thickness level or the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when the current frost layer thickness level of the outdoor heat exchanger is determined to be the fourth frost layer thickness level or the fifth frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0113] Determination of the second defrost control strategy: If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the second frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan. The previous defrost control strategy is a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set proportion (such as 10%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set proportion (such as 15%), and reducing the frequency of the compressor by a first set proportion (such as 10%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0114] Determination of the third defrost control strategy: If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the third frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the air conditioner is determined to be The current defrost control strategy of the air conditioner is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a first setting ratio (such as 10%), and reduce the frequency of the compressor by a first setting ratio (such as 10%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a second setting ratio (such as 15%), and reduce the frequency of the compressor by a third setting ratio (such as 20%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is to control the air conditioner to enter a preset reverse cycle defrost program.

[0115] Determination of the fourth defrost control strategy: If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fourth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set proportion (such as 10%), and reducing the frequency of the compressor by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set proportion (such as 10%), and reducing the frequency of the compressor by a first set proportion (such as 10%). The defrost control strategy is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a second setting ratio (such as 15%), and reduce the frequency of the compressor by a third setting ratio (such as 20%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a third setting ratio (such as 20%), and reduce the frequency of the compressor by a fourth setting ratio (such as 40%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a third setting ratio (such as 20%), and reduce the frequency of the compressor by a fifth setting ratio (such as 60%).

[0116] Determination of the fifth defrost control strategy: If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fifth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first setting ratio (such as 10%), and reducing the frequency of the compressor by a first setting ratio (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level. Under the condition that the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fourth setting ratio (such as 40%); under the condition that the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%); under the condition that the current frost thickness level of the outdoor heat exchanger is determined to be the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a sixth setting ratio (such as 80%). Among them, the first setting ratio, the second setting ratio, the third setting ratio, the fourth setting ratio, the fifth setting ratio, and the sixth setting ratio increase in sequence.

[0117] The following describes the preset instructions corresponding to the levels of the frost layer unevenness parameter Nu_Jr and the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. Figure 7 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level one, Figure 8 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level 2. Fig. 9 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level three, Fig.10 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level 4, Fig.11 Schematic diagram of the implementation strategy of the present invention under different frost thickness levels when the unevenness is level five. Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, different strategies are implemented under different frost layer unevenness parameters Nu_Jr and different frost layer thickness parameters Th_Jr to ensure that the unevenness is as small as possible before entering the reverse cycle defrosting, so as to achieve the effect of extending the defrosting time. Actuator module: Receives instructions from the central processor and performs corresponding operations. Furthermore, the actuator module controls the speed and direction of the outdoor fan and the frequency of the compressor to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0118] like Figure 7 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 1 include:

[0119] Step 11. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 12, 13, 14, 15 and 16.

[0120] Step 12: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0121] Step 13: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 1, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 2, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0122] Step 14: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 1, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 3, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0123] Step 15: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level four, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0124] Step 16: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level five, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0125] like Figure 8 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 2 include:

[0126] Step 21. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 22, 23, 24, 25 and 26.

[0127] Step 22: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 1, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0128] Step 23, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 2, enter the operation of keeping the existing outdoor fan speed unchanged and changing the wind direction of the outdoor fan to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0129] Step 24, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 3, the operation of changing the direction of the outdoor fan and simultaneously increasing the outdoor fan speed by 10% is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0130] Step 25. When the level of the frost unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost thickness parameter Th_Jr of the outdoor heat exchanger is level 4, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 10% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0131] Step 26: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 5, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0132] like Fig. 9 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 3 include:

[0133] Step 31. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 32, 33, 34, 35 and 36.

[0134] Step 32: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, the operation of keeping the existing outdoor fan speed unchanged and changing the wind direction of the outdoor fan is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0135] Step 33, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level two, the operation of changing the direction of the outdoor fan and simultaneously increasing the outdoor fan speed by 10% is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0136] Step 34, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level three, the operation of changing the fan direction, increasing the outdoor fan speed by 10%, and reducing the compressor frequency by 10% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0137] Step 35, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level four, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 20% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0138] Step 36: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level five, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0139] like Fig.10 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 4 include:

[0140] Step 41. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level four, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 42, 43, 44, 45 and 46.

[0141] Step 42, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level four, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, the operation of changing the direction of the outdoor fan and simultaneously increasing the outdoor fan speed by 10% is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0142] Step 43, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 4, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 2, the fan direction is changed, the outdoor fan speed is increased by 10%, and the compressor frequency is reduced by 10% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0143] Step 44, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level four, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level three, the operation of changing the fan direction, increasing the outdoor fan speed by 15%, and reducing the compressor frequency by 20% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0144] Step 45, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 4, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 4, the operation of changing the fan direction, increasing the outdoor fan speed by 20%, and reducing the compressor frequency by 40% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0145] Step 46: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 4, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 5, the fan direction is changed, the outdoor fan speed is increased by 20%, and the compressor frequency is reduced by 60% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0146] like Fig.11 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 5 include:

[0147] Step 51. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 52, 53, 54, 55 and 56.

[0148] Step 52: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, the operation of changing the fan direction, increasing the outdoor fan speed by 10%, and reducing the compressor frequency by 10% is performed to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0149] Step 53: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level two, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 20% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0150] Step 54, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level three, the operation of changing the fan direction, increasing the outdoor fan speed by 20%, and reducing the compressor frequency by 40% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0151] Step 55, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level four, the operation of changing the fan direction, increasing the outdoor fan speed by 20%, and reducing the compressor frequency by 60% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0152] Step 56: When the level of the frost unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost thickness parameter Th_Jr of the outdoor heat exchanger is level five, the fan direction is changed, the outdoor fan speed is increased by 20%, and the compressor frequency is reduced by 80% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0153] The solution of the present invention executes a preset extended defrost time control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, which can delay the defrost time and thus extend the heating time, ensuring continuous and efficient operation of the air conditioner in the heating mode and improving the user experience.

[0154] In some embodiments, in the scheme of the present invention, such as Figure 3 As shown, the control method of the air conditioner further includes: a process of executing a preset frost control strategy in combination with a heating demand degree parameter of the air conditioner.

[0155] Combine the following Figure 3 The method of the present invention is shown as a flow chart of an embodiment of executing a preset frost control strategy in combination with the heating demand degree parameter of the air conditioner, further illustrating the specific process of executing the preset frost control strategy in combination with the heating demand degree parameter of the air conditioner, including: steps S310 to S350.

[0156] At step S310, while the air conditioner is still running in heating mode, the set temperature of the air conditioner (such as the user set temperature T_s) is obtained, the indoor ambient temperature of the air conditioner (such as the indoor ambient temperature sensor temperature T_i) is obtained, and the air outlet temperature of the indoor unit (such as the indoor unit air outlet temperature sensor temperature T_o) is obtained.

[0157] In step S320, a heating demand parameter of the air conditioner (eg, a user heating demand parameter DHT) is determined according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit.

[0158] In step S330, the defrost strategy statistic of the air conditioner based on heating demand (such as the defrost strategy statistic SN based on user heating demand) is determined according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner.

[0159] At step S340, based on the correspondence between different predetermined defrost strategy statistics and different frost control strategies in the preset frost control strategy, the frost control strategy in the preset frost control strategy corresponding to the defrost strategy statistics based on the heating demand of the air conditioner is determined and recorded as the current frost control strategy of the air conditioner.

[0160] At step S350, the air conditioner is controlled to execute the current frost layer control strategy of the air conditioner, such as executing a preset control strategy for optimizing the uniformity of the frost layer of the outdoor heat exchanger, so as to optimize the uniformity of the frost layer of the outdoor heat exchanger by controlling the direction and speed of the outdoor fan and the frequency of the compressor, thereby reducing the frequent entry of the air conditioner into the defrost state and improving the overall defrost efficiency.

[0161] The scheme of the present invention proposes a frost control scheme, which takes into account the user's personalized needs for heating amount, and based on the user's indoor temperature setting and heating needs, proposes corresponding control strategies for improving the uniformity of the frost layer of the outdoor heat exchanger under light frosting, moderate frosting and heavy frosting conditions, so as to ensure that the corresponding control strategies are established for the heating amount required by the user. Figure 6 FIG. 2 is a schematic diagram of a control framework of an embodiment of the frost layer control method of the present invention. Figure 6 As shown, the system structure framework of the frost layer control solution provided by the solution of the present invention mainly includes: a sensor module and a central processing module.

[0162] Among them, the sensor module includes: an indoor ambient temperature sensor and an indoor unit outlet temperature sensor. The collected data obtained by the sensor module includes: the air conditioner setting temperature, the internal ambient temperature, and the indoor unit outlet temperature. The sensor module includes a temperature sensor for obtaining the set temperature of the air conditioner under the heating condition, collecting data at a set frequency, and transmitting data to the central processor at a set frequency for data processing. Further, the sensor module includes an indoor ambient temperature sensor, an indoor unit outlet temperature sensor, and a sensor for obtaining the temperature set by the user under the heating condition.

[0163] Central processing module: Based on the collected data obtained by the sensor module, it determines the user's heating demand and the frosting state of the outdoor heat exchanger, and executes the preset command according to the judgment result. Specifically, the central processing module: processes the data transmitted by the sensor, and issues a preset instruction to the actuator module to perform corresponding operations; further, it processes the indoor ambient temperature sensor temperature, the indoor unit outlet temperature sensor temperature, and the user-set temperature data collected by the sensor module, and issues a preset instruction to pass it to the actuator module to perform corresponding operations. Furthermore, a weighted statistical method is used for the collected data to derive the intensity of the user's heating demand, and the unevenness of the frost layer and the thickness of the frost layer are simultaneously considered to establish a corresponding actuator execution strategy, and issue a preset instruction to the actuator module.

[0164] In the scheme of the present invention, a frosting model is established through the existing sensor monitoring data of the air conditioner, the frosting state and the uniformity of the frost layer on the outdoor heat exchanger fins are judged according to the frosting model, and a control strategy for the steering of the outdoor unit axial fan at different time intervals is executed. At the same time, in order to make up for the performance loss of the outdoor unit axial fan, the defrost model control strategy includes speed difference control under different states to supplement the performance of the outdoor unit axial fan and ensure the uniformity of the frost layer. Therefore, reverse cycle defrosting is performed when a uniform thin frost state is achieved, reducing the number of defrosting times and the defrosting time, thereby improving the heating performance of the air conditioner.

[0165] In some embodiments, determining the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit in step S320 includes: calculating the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit according to the following formula:

[0166] DHT=P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -T Nor );

[0167] Among them, DHT represents the heating demand degree parameter of the air conditioner, P_s represents the preset basic starting parameter, T_i represents the indoor ambient temperature of the air conditioner, T_o represents the outlet air temperature of the indoor unit, T_s represents the set temperature of the air conditioner, T_Nor represents the preset basic temperature, W1 represents the weight coefficient of the indoor ambient temperature T_i of the air conditioner, W2 represents the weight coefficient of the outlet air temperature of the indoor unit, and W3 represents the weight coefficient of the set temperature of the air conditioner.

[0168] In some embodiments, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels, such as the first frost layer unevenness level, the second frost layer unevenness level, the third frost layer unevenness level, the fourth frost layer unevenness level, and the fifth frost layer unevenness level that increase in sequence. The level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels, such as the first frost layer thickness level, the second frost layer thickness level, the third frost layer thickness level, the fourth frost layer thickness level, and the fifth frost layer thickness level that increase in sequence. The level range of the heating demand level parameter of the air conditioner includes: more than two heating demand level levels, such as the first heating demand level level, the second heating demand level level, the third heating demand level level, the fourth heating demand level level, and the fifth heating demand level level that increase in sequence.

[0169] In step S330, according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, the defrost strategy statistical value based on the heating demand of the air conditioner is determined, including: according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, the defrost strategy statistical value based on the heating demand of the air conditioner is calculated according to the following formula:

[0170] SN = Nu_Jr's level + Th_Jr's level - DHT's level / 2;

[0171] Among them, SN represents the statistical value of the defrost strategy of the air conditioner based on the heating demand, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, Th_Jr represents the frost layer thickness parameter of the outdoor heat exchanger, and DHT represents the heating demand degree parameter of the air conditioner; if the level / 2 of DHT is a decimal, it is rounded up.

[0172] In the solution of the present invention, the weight of the indoor ambient temperature sensor temperature T_i is W1; the weight of the indoor unit air outlet temperature sensor temperature T_o is W2; the weight of the user set temperature T_s is W3. The basic temperature is T_Nor, the basic starting parameter is P_s, and the user heating demand degree parameter DHT is expressed by formula (3):

[0173] DHT=P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -T Nor ) (3).

[0174] Among them, DHT represents the user's heating demand degree parameter, P_s represents the basic starting parameter, T_i represents the indoor ambient temperature sensor temperature, T_o represents the indoor unit outlet temperature sensor temperature, T_s represents the user set temperature, T_Nor represents the basic temperature, W1 represents the weight of the indoor ambient temperature sensor temperature T_i, W2 represents the weight of the indoor unit outlet temperature sensor temperature T_o, and W3 represents the weight of the user set temperature T_s.

[0175] The user heating demand degree parameter DHT is graded and quantified for easy judgment. The quantification table is shown in Table 3. The user heating demand degree parameter DHT is divided into five levels, from level 1 to level 5 indicating that the heating demand is getting stronger and stronger.

[0176] Table 3

[0177]

[0178] In Table 3, s0, s1, s2, and s3 represent different interval thresholds of the user heating demand parameter DHT.

[0179] In the solution of the present invention, the defrost strategy statistical method based on the user's heating demand adopts the accumulation method between the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger, the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and the level of the user's heating demand degree parameter DHT. The defrost strategy statistical number SN based on the user's heating demand = the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger + the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger - the level of the user's heating demand degree parameter DHT / 2, where the decimals are omitted. The corresponding strategy is executed for the required defrost strategy statistical value SN to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequent entry of the air conditioner into the defrost state, and improve the overall defrost efficiency.

[0180] In some embodiments, the range of statistical values ​​of the defrost strategy based on heating demand of the air conditioner includes: a first statistical value, a second statistical value, a third statistical value, a fourth statistical value, a fifth statistical value, a sixth statistical value, a seventh statistical value, and an eighth statistical value, which increase in sequence, such as 3, 4, 5, 6, 7, 8, 9, and 10 in sequence. The preset frost layer control strategy includes at least one of the following: a strategy of not performing any operation, a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first setting ratio (such as 10%), and reducing the frequency of the compressor by a first setting ratio (such as 10%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a sixth setting ratio (such as 80%), and a strategy of controlling the air conditioner to enter a preset reverse cycle defrosting program.

[0181] In step S340, according to the correspondence between different predetermined defrost strategy statistics and different frost control strategies in the preset frost control strategy, a frost control strategy in the preset frost control strategy corresponding to the defrost strategy statistics based on the heating demand of the air conditioner is determined, which is recorded as the current frost control strategy of the air conditioner, including any of the following situations for determining the defrost control strategy:

[0182] Determination scenario of the first frost control strategy: if the defrost strategy statistic of the air conditioner based on heating demand is determined to be the first statistic, the second statistic, or the third statistic, then the current frost control strategy of the air conditioner is determined to be a strategy of not performing any operation.

[0183] Determination scenario of the second frost control strategy: If the statistical value of the defrost strategy based on heating demand of the air conditioner is determined to be the fourth statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set proportion (such as 10%), and reducing the frequency of the compressor by a first set proportion (such as 10%).

[0184] Determination scenario of the third frost control strategy: If the statistical value of the defrost strategy based on heating demand of the air conditioner is determined to be the fifth statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set proportion (such as 15%), and reducing the frequency of the compressor by a third set proportion (such as 20%).

[0185] The fourth frost control strategy determination situation: if the defrost strategy statistic based on the heating demand of the air conditioner is determined to be the sixth statistic, then the current frost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%). The first setting ratio, the second setting ratio, the third setting ratio, and the fifth setting ratio increase in sequence.

[0186] The fifth frost control strategy determination scenario: if the defrost strategy statistic of the air conditioner based on heating demand is determined to be the seventh statistic or the eighth statistic, then the current frost control strategy of the air conditioner is determined to be a strategy for controlling the air conditioner to enter a preset reverse cycle defrost program.

[0187] Fig.12 Schematic diagram of the actuator control strategy based on the defrosting strategy statistics SN of the present invention. Fig.12 As shown, the actuator control strategy based on the defrost strategy statistics SN includes:

[0188] Step 61, determine the value of the defrost strategy statistic number SN, and execute the corresponding strategy according to the value of the defrost strategy statistic number SN, see steps 62, 63, 64, 65 and 66 for details.

[0189] The defrost strategy statistics SN=Nu_Jr level+Th_Jr level-DHT level / 2.

[0190] Step 62: If it is determined that the value of the defrost strategy statistic SN is any value among 3, 4, and 5, no operation is performed, that is, no defrosting is required, and no control of the frost layer is required.

[0191] Step 63: If it is determined that the value of the defrost strategy statistic SN is 6, the fan direction is changed, the outdoor fan speed is increased by 10%, and the compressor frequency is reduced by 10% to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequency of the air conditioner entering the defrost state, and improve the overall defrost efficiency.

[0192] Step 64: If it is determined that the value of the defrost strategy statistic SN is 7, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 20% to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequency of the air conditioner entering the defrost state, and improve the overall defrost efficiency.

[0193] Step 65: If it is determined that the value of the defrost strategy statistic SN is 8, the fan direction is changed, the outdoor fan speed is increased by 20%, and the compressor frequency is reduced by 60% to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequency of the air conditioner entering the defrost state, and improve the overall defrost efficiency.

[0194] Step 66: If it is determined that the value of the defrost strategy statistic SN is any one of 9 and 10, the reverse cycle defrost operation is started, that is, reverse cycle defrost is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0195] In the scheme of the present invention, according to the defrost strategy statistics based on the user's heating demand, a preset control strategy for optimizing the uniformity of the frost layer of the outdoor heat exchanger is executed, which can optimize the uniformity of the frost layer of the outdoor heat exchanger, make the frost layer of the outdoor heat exchanger more uniform during the generation process, reduce the frequent entry of the air conditioner into the defrost state, and improve the overall defrost efficiency.

[0196] The solution of the present invention can improve the defrosting efficiency: by optimizing the uniformity of the frost layer of the outdoor heat exchanger, the frequent entry of the air conditioner into the defrosting state is reduced, and the overall defrosting efficiency is improved. The solution of the present invention can extend the heating time: postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience. The solution of the present invention can reduce energy consumption: reduce unnecessary defrosting operations, reduce energy consumption, and improve the energy efficiency ratio. The solution of the present invention can also improve the system stability: by accurately controlling the direction and speed of the outdoor fan, the system stability and reliability are improved, and the service life of the equipment is extended. In short, the solution of the present invention can not only significantly improve the heating performance of the air conditioner, but also effectively reduce energy consumption, providing a more comfortable and energy-saving user experience.

[0197] By adopting the technical solution of this embodiment, when the air conditioner is in heating operation, the frost layer unevenness parameter of the outdoor heat exchanger (such as unevenness parameter Nu_Jr) is determined according to the direction and speed of the outdoor fan, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger; the frost layer thickness parameter of the outdoor heat exchanger (such as frost layer thickness parameter Th_Jr) is determined according to the outdoor ambient humidity, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger; and according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, a preset extended defrost time control strategy is executed, and by delaying the defrost time, continuous and efficient operation of the air conditioner in heating mode is ensured, thereby improving the user experience.

[0198] Furthermore, the scheme of the present invention also determines the user heating demand degree parameter of the air conditioner (such as the user heating demand degree parameter DHT) according to the user set temperature, the indoor ambient temperature, and the indoor unit outlet air temperature; according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the user heating demand degree parameter of the air conditioner, a weighted statistical method is used to determine the defrost strategy statistics based on the user heating demand (such as the defrost strategy statistics SN based on the user heating demand); according to the defrost strategy statistics based on the user heating demand, a preset control strategy for optimizing the uniformity of the frost layer of the outdoor heat exchanger is executed, and by optimizing the uniformity of the frost layer of the outdoor heat exchanger, the air conditioner is reduced from frequently entering the defrost state, thereby improving the overall defrost efficiency. Therefore, by making the frost layer of the outdoor heat exchanger more uniform during the generation process, the defrost time is delayed and the heating capacity is guaranteed.

[0199] According to an embodiment of the present invention, a control device for an air conditioner corresponding to the control method for the air conditioner is also provided. Figure 4 The structure diagram of an embodiment of the device of the present invention is shown in FIG. The air conditioner comprises an outdoor unit and an indoor unit, the outdoor unit comprises a compressor, an outdoor heat exchanger and an outdoor fan, and the indoor unit comprises an air outlet; in the scheme of the present invention, Figure 4 As shown, the control device of the air conditioner includes: an acquisition unit 102 and a control unit 104. The acquisition unit 102 is such as a sensor module, or a module for acquiring data from a sensor module; the control unit 104 is such as a central processing unit module.

[0200] Wherein, the acquisition unit 102 is configured to acquire the frequency of the compressor (such as the compressor frequency Fre), the direction of the outdoor fan and the speed of the outdoor fan (such as the forward or reverse direction coefficient A and the speed R of the outdoor fan), the pipe temperature of the outdoor heat exchanger (such as the pipe temperature Ept of the outdoor heat exchanger), and the outdoor environment humidity of the air conditioner (such as the outdoor environment humidity Hum) when the air conditioner is in heating operation. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0201] The control unit 104 is configured to determine the unevenness parameter of the frost layer of the outdoor heat exchanger (such as unevenness parameter Nu_Jr) according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger. The unevenness of the frost layer of the outdoor heat exchanger refers to the inconsistency of the thickness of the frost on the outside and inside of the frost layer of the outdoor heat exchanger. For example, due to the flow of air from the outside to the inside at the initial stage of frost formation of the outdoor heat exchanger, the frost layer of the outdoor heat exchanger is thicker on the inside and thinner on the outside. For the specific functions and processing of the control unit 104, see step S120.

[0202] The control unit 104 is further configured to determine a frost thickness parameter (such as frost thickness parameter Th_Jr) of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger. The specific functions and processing of the control unit 104 are also shown in step S130.

[0203] The control unit 104 is further configured to execute a preset defrost control strategy, i.e., execute a preset extended defrost time control strategy, according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, so as to: control the normal operation of the air conditioner when defrosting is not required, so that the air conditioner can operate normally in the heating mode to ensure indoor comfort; control the direction and speed of the outdoor fan and the frequency of the compressor to delay the defrost time and extend the heating time when there is frost and the corresponding frost layer thickness and frost layer unevenness are not reached, and ensure indoor comfort as much as possible; perform reverse cycle defrosting when there is frost and the frost layer thickness and frost layer unevenness reach a certain standard, i.e., perform reverse cycle defrosting when a uniform thin frost state is achieved, so as to improve the performance of the outdoor heat exchanger, thereby ensuring the continuous and efficient operation of the air conditioner in the heating mode and improving the user experience. The specific functions and processing of the control unit 104 are also shown in step S140.

[0204] The system structure framework of a control scheme for the defrost mode of an air conditioner proposed in the solution of the present invention mainly includes: a data acquisition module, a central processing module and an actuator module. Among them, the data acquisition module: includes an outdoor environment humidity sensor, an outdoor environment temperature sensor, a heat exchanger copper tube temperature sensor, etc. The collected data obtained by the data acquisition module mainly include: external environment humidity, external environment temperature, copper tube temperature of the outdoor heat exchanger, compressor frequency, etc. Central processing module: for the collected data obtained by the data acquisition module, normalization processing is performed according to the data model formed by the laboratory measurement results to judge the frosting characteristics of the outdoor heat exchanger. When the frosting characteristics of the outdoor heat exchanger meet different preset conditions, different preset instructions are issued to the actuator module to perform different preset operations. Actuator module: includes a compressor and indoor and outdoor fans. When the actuator module receives the instruction from the central processing module, it adjusts the compressor frequency, indoor and outdoor fan speed and steering parameters. Specifically, Figure 5 FIG. 1 is a schematic diagram of a control framework of an embodiment of the defrosting control method of the present invention. Figure 5 As shown, the system structure framework of a control scheme for the defrost mode of an air conditioner proposed by the solution of the present invention includes: a sensor module, a central processing unit module, an execution module, and corresponding defrost judgment conditions and reverse cycle defrost commands.

[0205] The collected data obtained by the sensor module refers to the natural environment variables, indoor environment variables, and system variables of the air conditioner itself that can be monitored by the air conditioner. The sensor module specifically refers to a temperature sensor, a humidity sensor, etc. Furthermore, the collected data obtained by the sensor module includes external environment temperature (outdoor environment temperature) variables, external copper tube temperature (tube temperature of the outdoor heat exchanger) variables, and external environment humidity (outdoor environment humidity). The sensor module transmits the obtained collected data to the central processing unit module for data processing, wherein the sensor module performs data collection at a set frequency and transmits the obtained collected data to the central processing unit module at a set frequency.

[0206] In addition to data collection by the sensor module, the central processor obtains the air conditioner operation data, including: compressor operation frequency, indoor fan direction and speed data, outdoor fan direction and speed data. The air conditioner operation data is directly obtained by the central processor and processed accordingly.

[0207] The control scheme for the defrost mode of an air conditioner proposed in the solution of the present invention is to establish a frost model through the existing sensor monitoring data of the air conditioner after the user turns on the heating, judge the frost state and the uniformity of the frost layer on the outdoor heat exchanger fins according to the frost model, execute the control strategy of the steering of the axial flow fan of the outdoor unit at different time intervals, and perform reverse cycle defrost when a uniform thin frost state is achieved, thereby reducing the number of defrost times and the defrost time, thereby improving the heating performance of the air conditioner.

[0208] In some embodiments, the control unit 104 determines the frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the tube temperature of the outdoor heat exchanger, including: the control unit 104 is further configured to calculate the frost layer unevenness parameter of the outdoor heat exchanger according to the following formula according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor environment humidity of the air conditioner, and the tube temperature of the outdoor heat exchanger:

[0209]

[0210] Among them, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the coefficient used to characterize the direction of the outdoor fan, R represents the speed of the outdoor fan, R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent integration time.

[0211] In some embodiments, the control unit 104 determines the frost thickness parameter of the outdoor heat exchanger according to the outdoor environment humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger, including: the control unit 104 is further configured to calculate the frost thickness parameter of the outdoor heat exchanger according to the outdoor environment humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger according to the following formula:

[0212]

[0213] Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent integration time.

[0214] Specifically, in the scheme of the present invention, see Figure 5 In the example shown, the central processing module processes the data transmitted by the sensor module and the data obtained by itself, and compares the processing results with the preset instructions, and issues relevant instructions to the actuator module. Furthermore, the central processing module processes the data using at least one of neural network algorithm processing, fuzzy control processing, genetic algorithm processing, and PID (i.e. proportional-integral-differential) processing to determine the unevenness of frosting and the thickness of frosting, and then compares the unevenness of frosting and the thickness of frosting with the preset database, and issues a preset instruction to the actuator module after reaching the corresponding value.

[0215] In the scheme of the present invention, PID control is used for data processing, wherein integral (I) processing is performed on the direction and speed of the outdoor fan, integral (I) and differential (D) processing are performed on the outdoor ambient humidity, proportional (I) processing is performed on the compressor frequency, and differential (D) processing is performed on the tube temperature of the outdoor heat exchanger. According to the above parameters and processing methods, the parameters of frost unevenness and frost thickness are obtained, compared with the database, and corresponding instructions are issued to the actuator module.

[0216] Specifically, the speed and direction of the outdoor fan are represented, where the forward or reverse direction coefficient of the outdoor fan is A, and the speed R is integrated over time; the outdoor ambient humidity Hum is integrated and differentiated over time, where the integral processing result is used to judge the thickness of the frost layer, and the differential processing result is used to judge the unevenness of the frost layer; the compressor frequency Fre can be used as one of the representations of the frost layer growth rate, and is used to judge the unevenness and thickness of the frost layer, and the frequency Fre_Max is the maximum operating frequency of the compressor; the tube temperature Ept of the outdoor heat exchanger is differentiated on a time scale, where when the tube temperature of the outdoor heat exchanger is lower than T, its coefficient C changes accordingly.

[0217] The non-uniformity parameter Nu_Jr is expressed using formula (1):

[0218]

[0219] Among them, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the steering coefficient of the outdoor fan, R represents the speed of the outdoor fan, and R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity; Fre represents the compressor frequency, and Fre_Max represents the maximum frequency of the compressor; C represents the pipe temperature coefficient of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the starting point and end point of a preset period of time, such as the ratio of the speed R of the outdoor fan to the maximum speed R_Max of the outdoor fan is integrated over a period of time from t2 to t1, and the ratio of the compressor frequency Fre to the maximum frequency Fre_Max of the compressor is integrated over a period of time from t2 to t1. Among them, the A value is 1 when rotating forward and -1 when rotating reversely, and the C value is 2.6 times the normal value when the pipe temperature Ept of the outdoor heat exchanger is lower than the set temperature value T.

[0220] Formula (2) is used to express the frost thickness parameter Th_Jr:

[0221]

[0222] Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity; Fre represents the compressor frequency, Fre_Max represents the maximum frequency of the compressor; C represents the pipe temperature coefficient of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the starting point and end point of a preset period of time, such as the ratio of the speed R of the outdoor fan to the maximum speed R_Max of the outdoor fan is integrated over a period of time from t2 to t1, and the ratio of the compressor frequency Fre to the maximum frequency Fre_Max of the compressor is integrated over a period of time from t2 to t1. Among them, the C value is 2.6 times the normal value when the pipe temperature Ept of the outdoor heat exchanger is lower than T.

[0223] In the scheme of the present invention, PID processing is performed on the collected data obtained by the sensor module to determine the unevenness of frost and the thickness of frost, and then the unevenness of frost and the thickness of frost are compared with the preset database. After reaching the corresponding numerical value, a preset instruction is issued to the actuator module to execute the control strategy of the steering of the axial flow fan of the outdoor unit at different time intervals, and reverse cycle defrosting is performed when a uniform thin frost state is achieved, thereby reducing the number of defrosting times and the defrosting time, thereby improving the heating performance of the air conditioner.

[0224] In some embodiments, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels, such as a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence. The level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels, such as a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence.

[0225] The control unit 104 executes a preset defrosting control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, including:

[0226] The control unit 104 is further configured to determine the level of the frost layer unevenness parameter of the outdoor heat exchanger in the level range of the frost layer unevenness parameter of the outdoor heat exchanger, which is recorded as the current frost layer unevenness level of the outdoor heat exchanger. The specific functions and processing of the control unit 104 are also shown in step S210.

[0227] The control unit 104 is further configured to determine the level of the frost thickness parameter of the outdoor heat exchanger in the level range of the frost thickness parameter of the outdoor heat exchanger, which is recorded as the current frost thickness level of the outdoor heat exchanger. The specific functions and processing of the control unit 104 are also shown in step S220.

[0228] The control unit 104 is further configured to determine the defrost control strategy corresponding to the current frost thickness level of the outdoor heat exchanger under the current frost unevenness level of the outdoor heat exchanger in the preset defrost control strategy according to the correspondence between the different frost thickness levels under the predetermined different frost unevenness levels and the different defrost control strategies in the preset defrost control strategy, and record it as the current defrost control strategy of the air conditioner. The specific functions and processing of the control unit 104 are also referred to step S230.

[0229] The control unit 104 is further configured to control the air conditioner to execute the current defrost control strategy of the air conditioner. The specific functions and processing of the control unit 104 are also shown in step S240.

[0230] In the solution of the present invention, the frost layer non-uniformity parameter Nu_Jr of the outdoor heat exchanger is graded and represented as shown in Table 1 according to its numerical calculation results.

[0231] In Table 1, D0, D1, D2, and D3 represent different interval thresholds of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger. Levels I to V of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger indicate that the degree of frost layer unevenness of the outdoor heat exchanger is getting deeper and deeper.

[0232] The frost thickness parameter Th_Jr of the outdoor heat exchanger is graded according to its numerical calculation results as shown in Table 2.

[0233] In Table 2, T0, T1, T2, and T3 represent different interval thresholds of the frost thickness parameter Th_Jr of the outdoor heat exchanger. The levels i to v of the frost thickness parameter Th_Jr of the outdoor heat exchanger indicate that the frost thickness of the outdoor heat exchanger continues to thicken. When the frost unevenness parameter Nu_Jr of the outdoor heat exchanger is at level I during a certain period of time (t0-t), it indicates that the frost layer of the outdoor heat exchanger is uniform.

[0234] In the scheme of the present invention, by collecting data such as external environmental humidity, external environmental temperature, outdoor heat exchanger copper tube temperature, compressor frequency, etc., based on the unevenness of the frost layer, the monitoring data is sent to the central processing unit module for processing and state judgment is performed according to the formula, wherein the state judgment is integrated into two variables, namely, frost layer thickness and frost layer unevenness. The central processing unit module compares the frost layer thickness and frost layer unevenness data with the data rate parameter, sends the execution instruction to the actuator module, and performs corresponding operations, thereby solving the problem of long defrosting time caused by frost layer unevenness, thereby extending the heating time.

[0235] In some embodiments, the two or more frost layer unevenness levels include: a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence. The two or more frost layer thickness levels include: a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence. The preset defrost control strategy includes at least one of the following: a strategy of not performing any operation, a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan, a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio (such as 10%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio (such as 15%), and reducing the frequency of the compressor by a first set ratio (such as 10%), a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program, a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio (such as 10%), and reducing the frequency of the compressor by a first set ratio (such as 10%), and changing the direction of the outdoor fan. The strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%), the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fourth setting ratio (such as 40%), the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%), the strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a sixth setting ratio (such as 80%).

[0236] The control unit 104 determines, according to the correspondence between different frost layer thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategies, a defrost control strategy in the preset defrost control strategies corresponding to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger, recorded as the current defrost control strategy of the air conditioner, including any of the following determination situations of the defrost control strategy:

[0237] Determination scenario of the first defrost control strategy: the control unit 104 is specifically configured to, if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the first frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level or the second frost layer thickness level or the third frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the fourth frost layer thickness level or the fifth frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0238] Determination of the second defrost control strategy: The control unit 104 is further configured to, if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the second frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, determine that The current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set proportion (such as 10%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set proportion (such as 15%), and reducing the frequency of the compressor by a first set proportion (such as 10%); when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0239] Determination of the third defrost control strategy: The control unit 104 is further specifically configured to, if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the third frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level Under the condition that the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first setting ratio (such as 10%), and reducing the frequency of the compressor by a first setting ratio (such as 10%); under the condition that the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%); under the condition that the current frost thickness level of the outdoor heat exchanger is determined to be the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program.

[0240] Determination of the fourth defrost control strategy: The control unit 104 is further configured to, if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fourth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set proportion (such as 10%), and reducing the frequency of the compressor by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, determine. The current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%); when the current frost thickness level of the outdoor heat exchanger is determined to be the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fourth setting ratio (such as 40%); when the current frost thickness level of the outdoor heat exchanger is determined to be the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%).

[0241] Determination of the fifth defrost control strategy: The control unit 104 is specifically configured to, if it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fifth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set proportion (such as 10%), and reducing the frequency of the compressor by a first set proportion (such as 10%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set proportion (such as 15%), and reducing the frequency of the compressor by a third set proportion (such as 20%); when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level. In the case of the current frost layer thickness level of the outdoor heat exchanger, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fourth setting ratio (such as 40%); in the case of determining that the current frost layer thickness level of the outdoor heat exchanger is the fourth frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%); in the case of determining that the current frost layer thickness level of the outdoor heat exchanger is the fifth frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a sixth setting ratio (such as 80%). Wherein, the first setting ratio, the second setting ratio, the third setting ratio, the fourth setting ratio, the fifth setting ratio, and the sixth setting ratio increase in sequence.

[0242] The following describes the preset instructions corresponding to the levels of the frost layer unevenness parameter Nu_Jr and the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. Figure 7 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level one, Figure 8 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level 2. Fig. 9 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level three, Fig.10 Schematic diagram of the execution strategy of the present invention under different frost thickness levels when the unevenness is level 4, Fig.11 Schematic diagram of the implementation strategy of the present invention under different frost thickness levels when the unevenness is level five. Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, different strategies are implemented under different frost layer unevenness parameters Nu_Jr and different frost layer thickness parameters Th_Jr to ensure that the unevenness is as small as possible before entering the reverse cycle defrosting, so as to achieve the effect of extending the defrosting time. Actuator module: Receives instructions from the central processor and performs corresponding operations. Furthermore, the actuator module controls the speed and direction of the outdoor fan and the frequency of the compressor to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0243] like Figure 7 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 1 include:

[0244] Step 11. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 12, 13, 14, 15 and 16.

[0245] Step 12: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0246] Step 13: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 1, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 2, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0247] Step 14: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 1, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 3, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0248] Step 15: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level four, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0249] Step 16: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level one, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level five, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0250] like Figure 8 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 2 include:

[0251] Step 21. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 22, 23, 24, 25 and 26.

[0252] Step 22: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 1, no operation is performed, that is, defrosting is not required, and the frost layer does not need to be controlled.

[0253] Step 23, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 2, enter the operation of keeping the existing outdoor fan speed unchanged and changing the wind direction of the outdoor fan to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0254] Step 24, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 3, the operation of changing the direction of the outdoor fan and simultaneously increasing the outdoor fan speed by 10% is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0255] Step 25. When the level of the frost unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost thickness parameter Th_Jr of the outdoor heat exchanger is level 4, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 10% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0256] Step 26: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 2, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 5, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0257] like Fig. 9 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 3 include:

[0258] Step 31. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 32, 33, 34, 35 and 36.

[0259] Step 32: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, the operation of keeping the existing outdoor fan speed unchanged and changing the wind direction of the outdoor fan is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0260] Step 33, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level two, the operation of changing the direction of the outdoor fan and simultaneously increasing the outdoor fan speed by 10% is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0261] Step 34, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level three, the operation of changing the fan direction, increasing the outdoor fan speed by 10%, and reducing the compressor frequency by 10% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0262] Step 35, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level four, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 20% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0263] Step 36: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level three, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level five, the reverse cycle defrosting operation is performed, that is, reverse cycle defrosting is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0264] like Fig.10 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 4 include:

[0265] Step 41. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level four, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 42, 43, 44, 45 and 46.

[0266] Step 42, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level four, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, the operation of changing the direction of the outdoor fan and simultaneously increasing the outdoor fan speed by 10% is entered to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0267] Step 43, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 4, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 2, the fan direction is changed, the outdoor fan speed is increased by 10%, and the compressor frequency is reduced by 10% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0268] Step 44, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level four, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level three, the operation of changing the fan direction, increasing the outdoor fan speed by 15%, and reducing the compressor frequency by 20% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0269] Step 45, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 4, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 4, the operation of changing the fan direction, increasing the outdoor fan speed by 20%, and reducing the compressor frequency by 40% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0270] Step 46: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level 4, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level 5, the fan direction is changed, the outdoor fan speed is increased by 20%, and the compressor frequency is reduced by 60% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0271] like Fig.11 As shown in the figure, the execution strategies for different frost thickness levels when the unevenness is level 5 include:

[0272] Step 51. When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, determine the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and execute the corresponding strategy according to the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger. For details, refer to steps 52, 53, 54, 55 and 56.

[0273] Step 52: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level one, the operation of changing the fan direction, increasing the outdoor fan speed by 10%, and reducing the compressor frequency by 10% is performed to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0274] Step 53: When the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level two, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 20% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0275] Step 54, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level three, the operation of changing the fan direction, increasing the outdoor fan speed by 20%, and reducing the compressor frequency by 40% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0276] Step 55, when the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger is level four, the operation of changing the fan direction, increasing the outdoor fan speed by 20%, and reducing the compressor frequency by 60% is entered to postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0277] Step 56: When the level of the frost unevenness parameter Nu_Jr of the outdoor heat exchanger is level five, if the level of the frost thickness parameter Th_Jr of the outdoor heat exchanger is level five, the fan direction is changed, the outdoor fan speed is increased by 20%, and the compressor frequency is reduced by 80% to delay the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience.

[0278] The solution of the present invention executes a preset extended defrost time control strategy according to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, which can delay the defrost time and thus extend the heating time, ensuring continuous and efficient operation of the air conditioner in the heating mode and improving the user experience.

[0279] In some embodiments, in the scheme of the present invention, such as Figure 2 As shown, the control method of the air conditioner further includes: a process of executing a preset frost control strategy in combination with the heating demand degree parameter of the air conditioner, which is specifically as follows:

[0280] The acquisition unit 102 is further configured to continue to acquire the set temperature of the air conditioner (such as the user set temperature T_s), the indoor environment temperature of the air conditioner (such as the indoor environment temperature sensor temperature T_i), and the outlet air temperature of the indoor unit (such as the indoor unit outlet air temperature sensor temperature T_o) when the air conditioner is in heating operation. The specific functions and processing of the acquisition unit 102 are also shown in step S310.

[0281] The control unit 104 is further configured to determine a heating demand parameter (such as a user heating demand parameter DHT) of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit. The specific functions and processing of the control unit 104 are also shown in step S320.

[0282] The control unit 104 is further configured to determine the defrost strategy statistics based on the heating demand of the air conditioner (such as the defrost strategy statistics SN based on the user's heating demand) according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner. The specific functions and processing of the control unit 104 are also shown in step S330.

[0283] The control unit 104 is further configured to determine the frost control strategy corresponding to the defrost strategy statistic based on the heating demand of the air conditioner in the preset frost control strategy according to the correspondence between the different predetermined defrost strategy statistics and the different frost control strategies in the preset frost control strategy, and record it as the current frost control strategy of the air conditioner. The specific functions and processing of the control unit 104 are also shown in step S340.

[0284] The control unit 104 is further configured to control the air conditioner to execute the current frost layer control strategy of the air conditioner, such as executing a preset control strategy for optimizing the uniformity of the frost layer of the outdoor heat exchanger, so as to optimize the uniformity of the frost layer of the outdoor heat exchanger by controlling the direction and speed of the outdoor fan and the frequency of the compressor, thereby reducing the frequent entry of the air conditioner into the defrosting state and improving the overall defrosting efficiency. The specific functions and processing of the control unit 104 are also referred to step S350.

[0285] The scheme of the present invention proposes a frost control scheme, which takes into account the user's personalized needs for heating amount, and based on the user's indoor temperature setting and heating needs, proposes corresponding control strategies for improving the uniformity of the frost layer of the outdoor heat exchanger under light frosting, moderate frosting and heavy frosting conditions, so as to ensure that the corresponding control strategies are established for the heating amount required by the user. Figure 6 FIG. 2 is a schematic diagram of a control framework of an embodiment of the frost layer control method of the present invention. Figure 6 As shown, the system structure framework of the frost layer control solution provided by the solution of the present invention mainly includes: a sensor module and a central processing module.

[0286] Among them, the sensor module includes: an indoor ambient temperature sensor and an indoor unit outlet temperature sensor. The collected data obtained by the sensor module includes: the air conditioner setting temperature, the internal ambient temperature, and the indoor unit outlet temperature. The sensor module includes a temperature sensor for obtaining the set temperature of the air conditioner under the heating condition, collecting data at a set frequency, and transmitting data to the central processor at a set frequency for data processing. Further, the sensor module includes an indoor ambient temperature sensor, an indoor unit outlet temperature sensor, and a sensor for obtaining the temperature set by the user under the heating condition.

[0287] Central processing module: Based on the collected data obtained by the sensor module, it determines the user's heating demand and the frosting state of the outdoor heat exchanger, and executes the preset command according to the judgment result. Specifically, the central processing module: processes the data transmitted by the sensor, and issues a preset instruction to the actuator module to perform corresponding operations; further, it processes the indoor ambient temperature sensor temperature, the indoor unit outlet temperature sensor temperature, and the user-set temperature data collected by the sensor module, and issues a preset instruction to pass it to the actuator module to perform corresponding operations. Furthermore, a weighted statistical method is used for the collected data to derive the intensity of the user's heating demand, and the unevenness of the frost layer and the thickness of the frost layer are simultaneously considered to establish a corresponding actuator execution strategy, and issue a preset instruction to the actuator module.

[0288] In the scheme of the present invention, a frosting model is established through the existing sensor monitoring data of the air conditioner, the frosting state and the uniformity of the frost layer on the outdoor heat exchanger fins are judged according to the frosting model, and a control strategy for the steering of the outdoor unit axial fan at different time intervals is executed. At the same time, in order to make up for the performance loss of the outdoor unit axial fan, the defrost model control strategy includes speed difference control under different states to supplement the performance of the outdoor unit axial fan and ensure the uniformity of the frost layer. Therefore, reverse cycle defrosting is performed when a uniform thin frost state is achieved, reducing the number of defrosting times and the defrosting time, thereby improving the heating performance of the air conditioner.

[0289] In some implementations, the control unit 104 determines the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit, including: the control unit 104 is further configured to calculate the heating demand degree parameter of the air conditioner according to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit according to the following company:

[0290] DHT=P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -T Nor );

[0291] Wherein, DHT represents the heating demand parameter of the air conditioner, P_s represents the preset basic starting parameter, T_i represents the indoor ambient temperature of the air conditioner, T_o represents the outlet air temperature of the indoor unit, T_s represents the set temperature of the air conditioner, T_Nor represents the preset basic temperature, W1 represents the weight coefficient of the indoor ambient temperature T_i of the air conditioner, W2 represents the weight coefficient of the outlet air temperature of the indoor unit, and W3 represents the weight coefficient of the set temperature of the air conditioner;

[0292] In some embodiments, the level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels, such as the first frost layer unevenness level, the second frost layer unevenness level, the third frost layer unevenness level, the fourth frost layer unevenness level, and the fifth frost layer unevenness level that increase in sequence. The level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels, such as the first frost layer thickness level, the second frost layer thickness level, the third frost layer thickness level, the fourth frost layer thickness level, and the fifth frost layer thickness level that increase in sequence. The level range of the heating demand level parameter of the air conditioner includes: more than two heating demand level levels, such as the first heating demand level level, the second heating demand level level, the third heating demand level level, the fourth heating demand level level, and the fifth heating demand level level that increase in sequence.

[0293] The control unit 104 determines the defrost strategy statistics based on heating demand of the air conditioner according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, including: the control unit 104 is further configured to calculate the defrost strategy statistics based on heating demand of the air conditioner according to the following formula according to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner:

[0294] SN = Nu_Jr's level + Th_Jr's level - DHT's level / 2;

[0295] Among them, SN represents the statistical value of the defrost strategy of the air conditioner based on the heating demand, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, Th_Jr represents the frost layer thickness parameter of the outdoor heat exchanger, and DHT represents the heating demand degree parameter of the air conditioner; if the level / 2 of DHT is a decimal, it is rounded up.

[0296] In the solution of the present invention, the weight of the indoor ambient temperature sensor temperature T_i is W1; the weight of the indoor unit air outlet temperature sensor temperature T_o is W2; the weight of the user set temperature T_s is W3. The basic temperature is T_Nor, the basic starting parameter is P_s, and the user heating demand degree parameter DHT is expressed by formula (3):

[0297] DHT= P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -TNor ) (3).

[0298] Among them, DHT represents the user heating demand degree parameter, P_s represents the basic starting parameter, T_i represents the indoor ambient temperature sensor temperature, T_o represents the indoor unit outlet temperature sensor temperature, T_s represents the user set temperature, T_Nor represents the basic temperature, W1 represents the weight of the indoor ambient temperature sensor temperature T_i, W2 represents the weight of the indoor unit outlet temperature sensor temperature T_o, and W3 represents the weight of the user set temperature T_s. The user heating demand degree parameter DHT is graded and quantified for easy judgment. The quantification table is shown in Table 3. The level of the user heating demand degree parameter DHT is divided into five levels, from level 1 to level 5, indicating that the heating demand is getting stronger and stronger. In Table 3, s0, s1, s2, and s3 represent different interval thresholds of the user heating demand degree parameter DHT.

[0299] In the solution of the present invention, the defrost strategy statistical method based on the user's heating demand adopts the accumulation method between the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger, the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger, and the level of the user's heating demand degree parameter DHT. The defrost strategy statistical number SN based on the user's heating demand = the level of the frost layer unevenness parameter Nu_Jr of the outdoor heat exchanger + the level of the frost layer thickness parameter Th_Jr of the outdoor heat exchanger - the level of the user's heating demand degree parameter DHT / 2, where the decimals are omitted. The corresponding strategy is executed for the required defrost strategy statistical value SN to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequent entry of the air conditioner into the defrost state, and improve the overall defrost efficiency.

[0300] In some embodiments, the range of statistical values ​​of the defrost strategy based on heating demand of the air conditioner includes: a first statistical value, a second statistical value, a third statistical value, a fourth statistical value, a fifth statistical value, a sixth statistical value, a seventh statistical value, and an eighth statistical value, which increase in sequence, such as 3, 4, 5, 6, 7, 8, 9, and 10 in sequence. The preset frost layer control strategy includes at least one of the following: a strategy of not performing any operation, a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first setting ratio (such as 10%), and reducing the frequency of the compressor by a first setting ratio (such as 10%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%), a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a sixth setting ratio (such as 80%), and a strategy of controlling the air conditioner to enter a preset reverse cycle defrosting program.

[0301] The control unit 104 determines, according to the correspondence between different predetermined defrost strategy statistics and different frost control strategies in the preset frost control strategy, a frost control strategy in the preset frost control strategy corresponding to the defrost strategy statistics based on the heating demand of the air conditioner, recorded as the current frost control strategy of the air conditioner, including any of the following determination situations of the defrost control strategy:

[0302] The first frost control strategy determination scenario: the control unit 104 is further configured to determine that the current frost control strategy of the air conditioner is a strategy of not performing any operation if the defrost strategy statistic of the air conditioner based on the heating demand is determined to be the first statistic, the second statistic, or the third statistic;

[0303] The second frost control strategy determination scenario: the control unit 104 is further configured to determine that if the defrost strategy statistical value based on the heating demand of the air conditioner is determined to be a fourth statistical value, then determine that the current frost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first setting ratio (such as 10%), and reducing the frequency of the compressor by a first setting ratio (such as 10%);

[0304] Determination of the third frost layer control strategy: the control unit 104 is further configured to determine that if the defrost strategy statistical value based on the heating demand of the air conditioner is determined to be the fifth statistical value, then determine that the current frost layer control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio (such as 15%), and reducing the frequency of the compressor by a third setting ratio (such as 20%);

[0305] The fourth situation of determining the frost control strategy: the control unit 104 is further configured to determine that if the statistical value of the defrost strategy based on the heating demand of the air conditioner is determined to be the sixth statistical value, then the current frost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio (such as 20%), and reducing the frequency of the compressor by a fifth setting ratio (such as 60%); wherein the first setting ratio, the second setting ratio, the third setting ratio, and the fifth setting ratio increase in sequence.

[0306] Determination scenario of the fifth frost layer control strategy: The control unit 104 is further specifically configured to determine that the current frost layer control strategy of the air conditioner is a strategy for controlling the air conditioner to enter a preset reverse cycle defrost program if the statistical value of the defrost strategy based on heating demand of the air conditioner is determined to be the seventh statistical value or the eighth statistical value.

[0307] Fig.12 Schematic diagram of the actuator control strategy based on the defrosting strategy statistics SN of the present invention. Fig.12 As shown, the actuator control strategy based on the defrost strategy statistics SN includes:

[0308] Step 61, determine the value of the defrost strategy statistic number SN, and execute the corresponding strategy according to the value of the defrost strategy statistic number SN, see steps 62, 63, 64, 65 and 66 for details.

[0309] The defrost strategy statistics SN=Nu_Jr level+Th_Jr level-DHT level / 2.

[0310] Step 62: If it is determined that the value of the defrost strategy statistic SN is any value among 3, 4, and 5, no operation is performed, that is, no defrosting is required, and no control of the frost layer is required.

[0311] Step 63: If it is determined that the value of the defrost strategy statistic SN is 6, the fan direction is changed, the outdoor fan speed is increased by 10%, and the compressor frequency is reduced by 10% to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequency of the air conditioner entering the defrost state, and improve the overall defrost efficiency.

[0312] Step 64: If it is determined that the value of the defrost strategy statistic SN is 7, the fan direction is changed, the outdoor fan speed is increased by 15%, and the compressor frequency is reduced by 20% to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequency of the air conditioner entering the defrost state, and improve the overall defrost efficiency.

[0313] Step 65: If it is determined that the value of the defrost strategy statistic SN is 8, the fan direction is changed, the outdoor fan speed is increased by 20%, and the compressor frequency is reduced by 60% to optimize the uniformity of the frost layer of the outdoor heat exchanger, reduce the frequency of the air conditioner entering the defrost state, and improve the overall defrost efficiency.

[0314] Step 66: If it is determined that the value of the defrost strategy statistic SN is any one of 9 and 10, the reverse cycle defrost operation is started, that is, reverse cycle defrost is performed when a uniform thin frost state is achieved to improve the heating performance of the outdoor heat exchanger.

[0315] In the scheme of the present invention, according to the defrost strategy statistics based on the user's heating demand, a preset control strategy for optimizing the uniformity of the frost layer of the outdoor heat exchanger is executed, which can optimize the uniformity of the frost layer of the outdoor heat exchanger, make the frost layer of the outdoor heat exchanger more uniform during the generation process, reduce the frequent entry of the air conditioner into the defrost state, and improve the overall defrost efficiency.

[0316] The solution of the present invention can improve the defrosting efficiency: by optimizing the uniformity of the frost layer of the outdoor heat exchanger, the frequent entry of the air conditioner into the defrosting state is reduced, and the overall defrosting efficiency is improved. The solution of the present invention can extend the heating time: postpone the defrosting time, ensure the continuous and efficient operation of the air conditioner in the heating mode, and improve the user experience. The solution of the present invention can reduce energy consumption: reduce unnecessary defrosting operations, reduce energy consumption, and improve the energy efficiency ratio. The solution of the present invention can also improve the system stability: by accurately controlling the direction and speed of the outdoor fan, the system stability and reliability are improved, and the service life of the equipment is extended. In short, the solution of the present invention can not only significantly improve the heating performance of the air conditioner, but also effectively reduce energy consumption, providing a more comfortable and energy-saving user experience.

[0317] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0318] According to an embodiment of the present invention, an air conditioner corresponding to the control device of the air conditioner is also provided. The air conditioner may include: the control device of the air conditioner described above.

[0319] Since the processing and functions implemented by the air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0320] According to an embodiment of the present invention, a computer program product corresponding to an air conditioner is also provided, comprising a computer program, and when the computer program is executed by a processor, the steps of the air conditioner control method described above are implemented.

[0321] Since the processing and functions implemented by the product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned air conditioner, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0322] According to an embodiment of the present invention, a storage medium corresponding to the air conditioner control method is also provided, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the air conditioner control method described above.

[0323] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0324] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0325] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, an outdoor heat exchanger and an outdoor fan; The control method of the air conditioner comprises: When the air conditioner is in heating operation, the frequency of the compressor, the direction of the outdoor fan and the speed of the outdoor fan, the pipe temperature of the outdoor heat exchanger, and the outdoor ambient humidity of the air conditioner are obtained; Determining a frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger; Determining a frost thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger; A preset defrosting control strategy is executed according to a frost layer unevenness parameter of the outdoor heat exchanger and a frost layer thickness parameter of the outdoor heat exchanger.

2. The air conditioner control method according to claim 1, characterized in that: in, Determining the frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger includes: According to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger, the frost layer unevenness parameter of the outdoor heat exchanger is calculated according to the following formula: Wherein, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, A represents the coefficient used to characterize the direction of the outdoor fan, R represents the speed of the outdoor fan, and R_Max represents the maximum speed of the outdoor fan; Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, and Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, and Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent the integration time; and / or, Determining a frost thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger includes: According to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the tube temperature of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger is calculated according to the following formula: Among them, Th_Jr represents the frost thickness parameter of the outdoor heat exchanger, Hum represents the outdoor ambient humidity of the air conditioner; Fre represents the frequency of the compressor, Fre_Max represents the maximum frequency of the compressor; C represents the coefficient used to standardize the temperature range of the pipe temperature of the outdoor heat exchanger, Ept represents the pipe temperature of the outdoor heat exchanger; t2 and t1 represent integration time.

3. The air conditioner control method according to claim 1 or 2, characterized in that: The level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels; The level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels; According to the frost layer unevenness parameter of the outdoor heat exchanger and the frost layer thickness parameter of the outdoor heat exchanger, a preset defrosting control strategy is executed, including: Determine the level of the frost layer unevenness parameter of the outdoor heat exchanger within the level range of the frost layer unevenness parameter of the outdoor heat exchanger, and record it as the current frost layer unevenness level of the outdoor heat exchanger; Determine the level of the frost layer thickness parameter of the outdoor heat exchanger within the level range of the frost layer thickness parameter of the outdoor heat exchanger, and record it as the current frost layer thickness level of the outdoor heat exchanger; According to the correspondence between different frost layer thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategy, determine the defrost control strategy in the preset defrost control strategy corresponding to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger, and record it as the current defrost control strategy of the air conditioner; The air conditioner is controlled to execute a current defrost control strategy of the air conditioner.

4. The control method of the air conditioner according to claim 3, characterized in that: More than two frost layer unevenness levels, including: a first frost layer unevenness level, a second frost layer unevenness level, a third frost layer unevenness level, a fourth frost layer unevenness level, and a fifth frost layer unevenness level that increase in sequence; More than two frost layer thickness levels, including: a first frost layer thickness level, a second frost layer thickness level, a third frost layer thickness level, a fourth frost layer thickness level, and a fifth frost layer thickness level that increase in sequence; According to the correspondence between different frost layer thickness levels under different predetermined frost layer unevenness levels and different defrost control strategies in the preset defrost control strategy, a defrost control strategy corresponding to the current frost layer thickness level of the outdoor heat exchanger under the current frost layer unevenness level of the outdoor heat exchanger in the preset defrost control strategy is determined, which is recorded as the current defrost control strategy of the air conditioner, including: If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the first frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the second frost layer thickness level, or the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the fourth frost layer thickness level or the fifth frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program; If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the second frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of not performing any operation; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the speed of the outdoor fan unchanged and changing the direction of the outdoor fan; The current defrost control strategy is a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program; If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the third frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of keeping the rotation speed of the outdoor fan unchanged and changing the direction of the outdoor fan; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the rotation speed of the outdoor fan by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the rotation speed of the outdoor fan by a first set ratio. The current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of controlling the air conditioner to enter a preset reverse cycle defrost program; If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fourth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan and increasing the speed of the outdoor fan by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio. The current defrost control strategy is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a second setting ratio, and reduce the frequency of the compressor by a third setting ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, the current defrost control strategy of the air conditioner is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a third setting ratio, and reduce the frequency of the compressor by a fourth setting ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, the current defrost control strategy of the air conditioner is to change the direction of the outdoor fan, increase the speed of the outdoor fan by a third setting ratio, and reduce the frequency of the compressor by a fifth setting ratio; If it is determined that the current frost layer unevenness level of the outdoor heat exchanger is the fifth frost layer unevenness level, then: when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the first frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the second frost layer thickness level, the current defrost control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second set ratio, and reducing the frequency of the compressor by a third set ratio; when it is determined that the current frost layer thickness level of the outdoor heat exchanger is the third frost layer thickness level, Determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fourth setting ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fourth frost thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fifth setting ratio; when it is determined that the current frost thickness level of the outdoor heat exchanger is the fifth frost thickness level, determine that the current defrost control strategy of the air conditioner is a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a sixth setting ratio; Among them, the first setting ratio, the second setting ratio, the third setting ratio, the fourth setting ratio, the fifth setting ratio and the sixth setting ratio increase in sequence.

5. The air conditioner control method according to any one of claims 1 to 4, characterized in that: Also includes: Acquire the set temperature of the air conditioner, acquire the indoor ambient temperature of the air conditioner, and acquire the air outlet temperature of the indoor unit; Determining a heating demand degree parameter of the air conditioner according to a set temperature of the air conditioner, an indoor ambient temperature of the air conditioner, and an air outlet temperature of the indoor unit; Determining a defrosting strategy statistic based on heating demand for the air conditioner according to a frost layer unevenness parameter of the outdoor heat exchanger, a frost layer thickness parameter of the outdoor heat exchanger, and a heating demand degree parameter of the air conditioner; According to the correspondence between different predetermined defrost strategy statistics and different frost control strategies in the preset frost control strategy, a frost control strategy in the preset frost control strategy corresponding to the defrost strategy statistics based on the heating demand of the air conditioner is determined, and recorded as the current frost control strategy of the air conditioner; The air conditioner is controlled to execute a current frost control strategy of the air conditioner.

6. The air conditioner control method according to claim 5, characterized in that: in, Determining a heating demand parameter of the air conditioner according to a set temperature of the air conditioner, an indoor ambient temperature of the air conditioner, and an air outlet temperature of the indoor unit includes: According to the set temperature of the air conditioner, the indoor ambient temperature of the air conditioner, and the air outlet temperature of the indoor unit, the heating demand degree parameter of the air conditioner is calculated as follows: DHT=P_s-W1*(T i -T Nor )-W2*(T o -T Nor )+W3*(T s -T Nor ); Wherein, DHT represents the heating demand parameter of the air conditioner, P_s represents the preset basic starting parameter, T_i represents the indoor ambient temperature of the air conditioner, T_o represents the outlet air temperature of the indoor unit, T_s represents the set temperature of the air conditioner, T_Nor represents the preset basic temperature, W1 represents the weight coefficient of the indoor ambient temperature T_i of the air conditioner, W2 represents the weight coefficient of the outlet air temperature of the indoor unit, and W3 represents the weight coefficient of the set temperature of the air conditioner; and / or, The level range of the frost layer unevenness parameter of the outdoor heat exchanger includes: more than two frost layer unevenness levels; the level range of the frost layer thickness parameter of the outdoor heat exchanger includes: more than two frost layer thickness levels; the level range of the heating demand degree parameter of the air conditioner includes: more than two heating demand degree levels; Determining a defrosting strategy statistical value based on heating demand of the air conditioner according to a frost layer unevenness parameter of the outdoor heat exchanger, a frost layer thickness parameter of the outdoor heat exchanger, and a heating demand degree parameter of the air conditioner includes: According to the frost layer unevenness parameter of the outdoor heat exchanger, the frost layer thickness parameter of the outdoor heat exchanger, and the heating demand degree parameter of the air conditioner, the defrost strategy statistical value based on the heating demand of the air conditioner is calculated according to the following formula: SN = Nu_Jr's level + Th_Jr's level - DHT's level / 2; Among them, SN represents the statistical value of the defrost strategy of the air conditioner based on the heating demand, Nu_Jr represents the frost layer unevenness parameter of the outdoor heat exchanger, Th_Jr represents the frost layer thickness parameter of the outdoor heat exchanger, and DHT represents the heating demand degree parameter of the air conditioner; if the level / 2 of DHT is a decimal, it is rounded up.

7. The air conditioner control method according to claim 5 or 6, characterized in that: The range of the defrost strategy statistical value of the air conditioner based on the heating demand includes: a first statistical value, a second statistical value, a third statistical value, a fourth statistical value, a fifth statistical value, a sixth statistical value, a seventh statistical value, and an eighth statistical value which increase in sequence; According to the correspondence between different predetermined defrost strategy statistics and different frost layer control strategies in the preset frost layer control strategy, a frost layer control strategy corresponding to the defrost strategy statistics based on the heating demand of the air conditioner in the preset frost layer control strategy is determined, which is recorded as the current frost layer control strategy of the air conditioner, including: If it is determined that the defrost strategy statistic of the air conditioner based on the heating demand is the first statistic value, the second statistic value, or the third statistic value, then determining that the current frost layer control strategy of the air conditioner is a strategy of not performing any operation; If it is determined that the defrost strategy statistical value based on the heating demand of the air conditioner is a fourth statistical value, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a first set ratio, and reducing the frequency of the compressor by a first set ratio; If it is determined that the defrost strategy statistic of the air conditioner based on heating demand is the fifth statistic, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a second setting ratio, and reducing the frequency of the compressor by a third setting ratio; If it is determined that the defrost strategy statistic of the air conditioner based on heating demand is the sixth statistic, then the current frost layer control strategy of the air conditioner is determined to be a strategy of changing the direction of the outdoor fan, increasing the speed of the outdoor fan by a third setting ratio, and reducing the frequency of the compressor by a fifth setting ratio; wherein the first setting ratio, the second setting ratio, the third setting ratio, and the fifth setting ratio increase in sequence; If the defrost strategy statistic of the air conditioner based on heating demand is determined to be the seventh statistic or the eighth statistic, the current frost layer control strategy of the air conditioner is determined to be a strategy for controlling the air conditioner to enter a preset reverse cycle defrost program.

8. A control device for an air conditioner, characterized in that: The air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, an outdoor heat exchanger and an outdoor fan; The control device of the air conditioner comprises: an acquisition unit, configured to acquire, when the air conditioner is in heating operation, the frequency of the compressor, the direction of rotation of the outdoor fan and the speed of the outdoor fan, the pipe temperature of the outdoor heat exchanger, and the outdoor ambient humidity of the air conditioner; A control unit configured to determine a frost layer unevenness parameter of the outdoor heat exchanger according to the frequency of the compressor, the direction of the outdoor fan, the speed of the outdoor fan, the outdoor ambient humidity of the air conditioner, and the pipe temperature of the outdoor heat exchanger; The control unit is further configured to determine a frost thickness parameter of the outdoor heat exchanger according to the outdoor ambient humidity of the air conditioner, the frequency of the compressor, and the pipe temperature of the outdoor heat exchanger; The control unit is further configured to execute a preset defrosting control strategy according to a frost layer unevenness parameter of the outdoor heat exchanger and a frost layer thickness parameter of the outdoor heat exchanger.

9. An air conditioner, characterized in that: include: The control device for an air conditioner as claimed in claim 8.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the air conditioner control method according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the air conditioner control method according to any one of claims 1 to 7 are implemented.

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