A frost control method and device for an air conditioner and the air conditioner

Abstract

The present application belongs to the technical field of air conditioners, and particularly relates to a frost control method and device for an air conditioner and the air conditioner. The air conditioner comprises a frost control judgment entry stage, a frost control judgment stage and a frost control stage. The control method comprises the following steps: in a heating mode, obtaining an outdoor heat exchanger side working condition, system operation parameters and a frost layer parameter of the outdoor heat exchanger; when the outdoor heat exchanger side working condition, the system operation parameters and the frost layer parameter satisfy a first judgment condition, entering the frost control judgment stage; in the frost control judgment stage, when the outdoor heat exchanger side working condition and the frost layer parameter satisfy a second judgment condition, entering the frost control stage. The present application solves the problem of existing air conditioners that are misjudged in frost control or defrosting.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner defrosting control method, control device, and air conditioner. Background Technology

[0002] When heat pump air conditioners are operating in winter, they experience frosting and defrosting issues, which leads to reduced heat exchange capacity, intermittent heating, and fluctuations in room temperature, resulting in a poor heating comfort experience for users.

[0003] Current air conditioners determine whether to enter defrost or anti-frost mode based on outdoor ambient temperature, outdoor humidity, the ratio of air conditioner load to rated load, and the temperature of the external pipe. The external pipe temperature is used as the target temperature, and the compressor frequency and electronic expansion valve opening are adjusted accordingly. Others determine whether to activate defrost based on outdoor ambient temperature, the difference between indoor temperature and set temperature, compressor frequency, or the attenuation ratio of heating output to target output. However, none of these methods take into account the actual amount of frost buildup on the air conditioner, which may lead to misjudgments in defrost or anti-frost mode.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] In view of this, the present invention discloses a defrosting control method, control device and air conditioner for air conditioners, in order to solve the problem of false judgment of defrosting or defrosting in existing air conditioners.

[0006] To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0007] The first aspect of this invention discloses a defrosting control method for an air conditioner, the air conditioner including a defrosting judgment stage and a defrosting control stage, the control method including:

[0008] In heating mode, obtain the operating conditions of the outdoor heat exchanger, system operating parameters, and frost layer parameters of the outdoor heat exchanger;

[0009] When the outdoor heat exchanger side operating conditions, the system operating parameters, and the frost layer parameters meet the first judgment condition, the frost suppression judgment stage is entered.

[0010] In the frost suppression judgment stage, when the operating conditions of the outdoor heat exchanger side and the frost layer parameters meet the second judgment condition, the frost suppression control stage is entered.

[0011] Further optionally, the outdoor heat exchanger side operating conditions include outdoor ambient temperature and outdoor ambient humidity, or the outdoor heat exchanger side operating conditions are outdoor ambient temperature.

[0012] The system operating parameters include heating operation duration, outdoor heat exchanger tube temperature, and compressor exhaust temperature.

[0013] The frost parameters include the cumulative frost amount and frost rate of the outdoor heat exchanger.

[0014] Further optionally, when the outdoor heat exchanger side operating conditions include outdoor ambient temperature and outdoor ambient humidity, the step of entering the defrosting judgment stage when the outdoor heat exchanger side operating conditions, the system operating parameters, and the frost layer parameters meet the first judgment condition includes...

[0015] The anti-frost determination stage is entered when all of the following conditions are met simultaneously:

[0016] The outdoor ambient temperature is less than or equal to the first preset temperature.

[0017] The heating operation duration is greater than or equal to the first preset duration;

[0018] The outdoor ambient humidity is greater than or equal to the preset humidity.

[0019] The cumulative frost amount is greater than or equal to the first preset frost amount.

[0020] Further optionally, the cumulative frost amount is the frost layer mass, and the magnitude of the first preset frost amount is determined according to the outdoor ambient temperature and the outdoor ambient humidity;

[0021] Alternatively, the cumulative frost amount is the frost layer thickness, and the first preset frost amount is a constant.

[0022] Further optionally, determining the first preset frost amount based on the outdoor ambient temperature and the outdoor ambient humidity includes...

[0023] The air conditioner has a first mapping table pre-stored for outdoor ambient temperature, outdoor ambient humidity and first preset frost amount. The first preset frost amount corresponding to the current outdoor ambient temperature and the current outdoor ambient humidity is determined according to the first mapping table.

[0024] Further optionally, when the operating condition on the outdoor heat exchanger side is the outdoor ambient temperature, the step of entering the defrosting judgment stage when the operating condition on the outdoor heat exchanger side, the system operating parameters, and the frost layer parameters meet the first judgment condition includes...

[0025] The anti-frost determination stage is entered when all of the following conditions are met simultaneously:

[0026] The outdoor ambient temperature is less than or equal to the second preset temperature.

[0027] The heating operation duration is greater than or equal to the second preset duration;

[0028] The cumulative frost amount is greater than or equal to the second preset frost amount.

[0029] Further optionally, the cumulative frost amount is the frost layer mass, and the second preset frost amount is determined based on the outdoor ambient temperature and the outdoor heat exchanger tube temperature;

[0030] Alternatively, the cumulative frost amount is the frost layer thickness, and the second preset frost amount is a constant.

[0031] Further optionally, the second preset frosting amount is determined based on the outdoor ambient temperature and the outdoor heat exchanger tube temperature, including...

[0032] The air conditioner has a second mapping table pre-stored for outdoor ambient temperature, outdoor heat exchanger pipe temperature and second preset frost amount. The second preset frost amount corresponding to the current outdoor ambient temperature and the current outdoor heat exchanger pipe temperature is determined according to the second mapping table.

[0033] Further optionally, when the operating conditions on the outdoor heat exchanger side and the frost layer parameters meet the second judgment condition, the process enters the frost suppression control stage, including...

[0034] The anti-frost control phase is entered when all of the following conditions are met simultaneously:

[0035] The frosting rate decreases over a preset duration.

[0036] The outdoor heat exchanger tube temperature is ≤ outdoor air dew point temperature + set dew point temperature value;

[0037] The compressor exhaust temperature is greater than the preset exhaust temperature.

[0038] Further optionally, when the operating conditions on the outdoor heat exchanger side include outdoor ambient temperature and outdoor ambient humidity, the preset exhaust temperature is determined based on the outdoor ambient temperature and the outdoor ambient humidity.

[0039] Alternatively, the air conditioner may have a third mapping table pre-stored for outdoor ambient temperature, outdoor ambient humidity, and preset exhaust temperature, and the preset exhaust temperature corresponding to the current outdoor ambient temperature and current outdoor ambient humidity may be determined according to the third mapping table.

[0040] Further optionally, when the operating condition of the outdoor heat exchanger side is the outdoor ambient temperature, the preset exhaust temperature is determined based on the outdoor ambient temperature.

[0041] Further optionally, determining the preset exhaust temperature based on the outdoor ambient temperature includes...

[0042] The air conditioner has a fourth mapping table pre-stored for outdoor ambient temperature and preset exhaust temperature. The preset exhaust temperature corresponding to the current outdoor ambient temperature is determined according to the fourth mapping table.

[0043] Further, optionally, the control method further includes:

[0044] During the frost suppression control phase, the system operating parameters are corrected based on the frost suppression parameters.

[0045] Further optionally, the defrosting parameter is a function of the outdoor heat exchanger side operating conditions, the outdoor heat exchanger tube temperature, the current cumulative frost amount, and the current frost rate, and / or,

[0046]

[0047] Where, λ 抑霜参数 For frost suppression parameters, 0 ≤ λ 抑霜参数 ≤1; ν 结霜速率 ε is the current frosting rate; ε is a constant, or its magnitude can be determined based on the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the current cumulative frosting amount, and the current frosting rate; τ 结霜量 This represents the current cumulative frost level; T 外环 Outdoor ambient temperature; T 室外换热器管温 This refers to the temperature of the outdoor heat exchanger tubes.

[0048] Further optionally, the correction of system operating parameters based on defrosting parameters includes:

[0049] The system's current temperature parameter is corrected based on the defrost suppression parameter, and the target system temperature parameter is a function of the defrost suppression parameter and the current system temperature parameter.

[0050] And / or, T 系统目标温度参数 =a×T 系统当前温度参数 +λ 抑霜参数 ;

[0051] And / or, T 系统目标温度参数 =λ 抑霜参数 ×T 系统当前温度参数 +b;

[0052] Among them, T 系统目标温度参数 T represents the system's target temperature parameter. 系统当前温度参数 λ represents the current system temperature parameter. 抑霜参数 These are the defrosting parameters; a and b are constants, or their values ​​can be determined based on the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the current cumulative frost amount, and the current frost rate.

[0053] Optionally, after correcting the current system temperature parameter, the step of correcting the system operating parameters based on the defrost parameter further includes...

[0054] The current opening degree of the electronic expansion valve is corrected based on the current system temperature parameters and the target system temperature parameters.

[0055] Further optionally, the step of correcting the current opening of the electronic expansion valve based on the current system temperature parameter and the target system temperature parameter includes:

[0056] The correction value for the electronic expansion valve is determined based on the current temperature parameters of the system and the target temperature parameters of the system.

[0057] The target opening of the electronic expansion valve is determined based on the current opening and the correction value of the electronic expansion valve. The target opening of the electronic expansion valve satisfies: P 目标开度 =P 当前开度 +△P;

[0058] Where: P 目标开度 P represents the target opening degree of the electronic expansion valve. 当前开度 ΔP represents the current opening degree of the electronic expansion valve; ΔP represents the correction value of the electronic expansion valve.

[0059] Further optionally, the step of determining the electronic expansion valve correction value based on the current system temperature parameter and the target system temperature parameter includes...

[0060] The correction value of the electronic expansion valve is a function of the current system temperature parameter and the target system temperature parameter, and / or,

[0061] △P=K 抑霜开度系数 ×(T 系统目标温度参数 -T 系统当前温度参数 ),in:

[0062] △P is the correction value for the electronic expansion valve; K 抑霜开度系数 K is a constant, or determined based on the current cumulative frost amount and the current frost rate. 抑霜开度系数 Size; T 系统目标温度参数 T represents the system's target temperature parameter. 系统当前温度参数 This is the current temperature parameter of the system.

[0063] Further optionally, the current system temperature parameter is at least one of the current system evaporation temperature, compressor suction temperature, and compressor discharge temperature.

[0064] Further, optionally, the step of correcting the system operating parameters based on the defrosting parameters also includes...

[0065] The current opening of the electronic expansion valve is corrected based on the anti-frost parameter. The target opening of the electronic expansion valve is a function of the anti-frost parameter and the current opening of the electronic expansion valve.

[0066] And / or, P 目标开度 =λ 抑霜参数 ×P 当前开度 +c,

[0067] And / or, P 目标开度 =d×P 当前开度 +λ 抑霜参数 ;

[0068] Where: P 目标开度 P represents the target opening degree of the electronic expansion valve. 当前开度 λ represents the current opening degree of the electronic expansion valve. 抑霜参数 is the frost suppression parameter; c is a constant; d is a constant.

[0069] A second aspect of the present invention discloses a control device for an air conditioner, comprising one or more processors and a non-transitory computer-readable storage medium storing program instructions. When the one or more processors execute the program instructions, the one or more processors are used to implement the defrost control method provided in the first aspect.

[0070] The third aspect of the present invention discloses an air conditioner that employs the defrosting control method provided in the first aspect, or includes the control device provided in the second aspect.

[0071] Beneficial effects: In heating mode, by monitoring the real-time amount and rate of frost during the heating process, and combining the current operating parameters and system operating parameters, the timing for entering the defrost control is determined. Based on the real-time calculated dynamic defrost parameters, the operating parameters of the air conditioner are adjusted in real time to ensure the timeliness and efficiency of defrost control in the air conditioning system. Attached Figure Description

[0072] The above and other objects, features, and advantages of the present invention will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments disclosed in the present invention; those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0073] Figure 1 A schematic flowchart of an air conditioner defrosting control method according to an embodiment of the present invention is shown as an example;

[0074] Figure 2 A schematic flowchart of an air conditioner defrosting control method according to an embodiment of the present invention is shown as an example.

[0075] Figure 3 A schematic flowchart of an air conditioner defrosting control method according to an embodiment of the present invention is shown as an example. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0077] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0078] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0079] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0080] The control method of an air conditioner according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0081] Figure 1 This is a schematic flowchart of an air conditioner defrosting control method according to an embodiment of the present invention. (Refer to...) Figure 1 The air conditioner in this embodiment includes a defrost judgment stage and a defrost control stage, and the control method of the air conditioner includes:

[0082] S11: In heating mode, obtain the operating conditions of the outdoor heat exchanger, system operating parameters, and frost layer parameters of the outdoor heat exchanger.

[0083] In this embodiment, the air conditioner monitors the outdoor heat exchanger's operating conditions, heating duration, outdoor heat exchanger pipe temperature, compressor exhaust temperature, and cumulative frost amount and rate in real time or at set intervals during heating mode. The set intervals can be 1 second, 2 seconds, or other intervals. This embodiment includes a frost prediction module that detects the cumulative frost amount and rate of the outdoor heat exchanger. The frost prediction module can optionally calculate the cumulative frost amount and rate based on changes in the outdoor unit's inlet and outlet air parameters, conduct full-condition tests on these changes, and then use a neural network to build a frost prediction model based on the obtained test data to predict the frost amount and rate during heating mode. When the outdoor unit of this embodiment is equipped with a humidity sensor, the outdoor heat exchanger's operating conditions include the outdoor ambient temperature and humidity; when the outdoor unit does not have a humidity sensor, the outdoor heat exchanger's operating conditions are simply the outdoor ambient temperature.

[0084] S12: When the outdoor heat exchanger side operating conditions, system operating parameters and frost layer parameters meet the first judgment condition, the frost suppression judgment stage is entered.

[0085] In this embodiment, the air conditioner can determine the timing of entering the defrost suppression judgment stage after obtaining the outdoor heat exchanger side operating conditions, system operating parameters, and frost layer parameters. That is, when the outdoor heat exchanger side operating conditions, system operating parameters, and frost layer parameters meet the first judgment condition, the defrost suppression judgment stage is entered.

[0086] In one implementation of this embodiment, when the operating conditions of the outdoor heat exchanger side of the air conditioner include outdoor ambient temperature and outdoor ambient humidity, the timing for entering the defrost judgment stage can be determined based on the outdoor ambient temperature, outdoor ambient humidity, heating operation time, and accumulated frost amount.

[0087] Specifically, the frost suppression judgment stage begins when all of the following conditions are met simultaneously:

[0088] The outdoor ambient temperature is less than or equal to the first preset temperature, wherein the range of the first preset temperature can be selected as [-20℃, 10℃], and for example, the first preset temperature is 6℃;

[0089] The heating operation time is greater than or equal to the first preset time, wherein the value range of the first preset time is selectable as [0, 300 min], and for example, the first preset time is 20℃;

[0090] Outdoor ambient humidity ≥ preset humidity, wherein the preset humidity value range can be selected as [0, 100%], for example, the preset humidity is 50%;

[0091] The cumulative frost amount is greater than or equal to the first preset frost amount. The cumulative frost amount can be either the frost thickness or the frost mass. If the cumulative frost amount is the frost thickness, the first preset frost amount is a constant with a value range of [0, 10 mm]. For example, the first preset frost amount is 0.5 mm.

[0092] If the accumulated frost amount is the frost layer thickness, the first preset frost amount is determined based on the outdoor ambient temperature and outdoor ambient humidity after stable operation. For example, the air conditioner pre-stores a first mapping relationship table of outdoor ambient temperature, outdoor ambient humidity and first preset frost amount, as shown in Table 1 below. The first preset frost amount corresponding to the current outdoor ambient temperature and current outdoor ambient humidity can be determined according to the first mapping relationship table.

[0093] Table 1. Mapping Relationship between Outdoor Ambient Temperature, Outdoor Ambient Humidity, and First Preset Frost Calculation Amount

[0094] <![CDATA[τ 结霜量0 ]]> <![CDATA[(-∞,T 外环3 )]]> <![CDATA[[T 外环3 ,T 外环2 )]]> <![CDATA[[T 外环2 ,T 外环1 )]]> <![CDATA[[T 外环1 ,T 外环0 ]]]> <![CDATA[[RH 外环0 ,RH 外环1 )]]> <![CDATA[τ 结霜量0-11 ]]> <![CDATA[τ 结霜量0-12 ]]> <![CDATA[τ 结霜量0-13 ]]> <![CDATA[τ 结霜量0-14 ]]> <![CDATA[[RH 外环1 ,RH 外环2 )]]> <![CDATA[τ 结霜量0-21 ]]> <![CDATA[τ 结霜量0-22 ]]> <![CDATA[τ 结霜量0-23 ]]> <![CDATA[τ 结霜量0-24 ]]> <![CDATA[[RH 外环2 ,100%]]]> <![CDATA[τ 结霜量0-31 ]]> <![CDATA[τ 结霜量0-32 ]]> <![CDATA[τ 结霜量0-33 ]]> <![CDATA[τ 结霜量0-34 ]]>

[0095] In Table 1, RH 外环0 RH 外环1 RH 外环2 The outdoor ambient temperature is the determining value, satisfying: 0 ≤ RH 外环0 ≤RH 外环1 ≤RH 外环2 ≤100%, for example, RH 外环0 =50%, RH 外环1 =75%, RH 外环2 =85%; T 外环0 T 外环1 T 外环2 T 外环3 The outdoor ambient temperature is the determining value, satisfying: -20℃ ≤ T 外环3 ≤T 外环2 ≤T 外环1 ≤T 外环0 ≤10℃, for example, T 外环3 = -15℃, T 外环2 = -10℃, T 外环1 = -5℃, T 外环0 =6℃; τ 结霜量0-i The first preset frost amount for different outdoor ambient temperatures and humidity levels satisfies: τ 结霜量0-i ∈[0,10000g]; For example, under the outer ring 2℃ / 1℃ (2℃ is the dry-bulb temperature, 1℃ is the wet-bulb temperature, and the corresponding relative humidity is 84%) operating condition, the corresponding τ 结霜量0-22 ∈[0,10000g], 400g can be used for 1.5 horsepower models and 300g can be used for 1 horsepower models.

[0096] In another implementation of this embodiment, when the operating condition of the outdoor heat exchanger side of the air conditioner is the outdoor ambient temperature, the timing of entering the defrost judgment stage can be determined based on the outdoor ambient temperature, the heating operation time, and the cumulative frost amount.

[0097] Specifically, the frost suppression judgment stage begins when all of the following conditions are met simultaneously:

[0098] The outdoor ambient temperature is less than or equal to the second preset temperature, wherein the range of the second preset temperature can be selected as [-20℃, 10℃], and for example, the second preset temperature is 6℃;

[0099] The heating operation time is greater than or equal to the second preset time, wherein the value range of the second preset time is selectable as [0, 300 min], and for example, the second preset time is 20℃;

[0100] The cumulative frost amount is greater than or equal to the second preset frost amount. The cumulative frost amount can be selected as the frost thickness or the frost mass. If the cumulative frost amount is the frost thickness, the second preset frost amount is a constant with a value range of [0, 10 mm]. For example, the second preset frost amount is 0.5 mm.

[0101] If the cumulative frost amount is the frost layer thickness, the second preset frost amount is determined based on the outdoor ambient temperature and the outdoor heat exchanger pipe temperature after stable operation. For example, the air conditioner pre-stores a second mapping relationship table of outdoor ambient temperature, outdoor heat exchanger pipe temperature, and second preset frost amount, as shown in Table 2 below. The second preset frost amount corresponding to the current outdoor ambient temperature and the current outdoor heat exchanger pipe temperature can be determined according to the second mapping relationship table.

[0102] Table 2. Second Mapping Relationship between Outdoor Ambient Temperature, Outdoor Heat Exchanger Tube Temperature, and Second Preset Frost Quantity

[0103] <![CDATA[τ 结霜量0 ]]> <![CDATA[(-∞,T 外环3 )]]> <![CDATA[[T 外环3 ,T 外环2 )]]> <![CDATA[[T 外环2 ,T 外环1 )]]> <![CDATA[[T 外环1 ,T 外环0 ]]]> <![CDATA[[T 外管温度1 ,T 外管温度0 ]]]> <![CDATA[τ 结霜量0-11 ]]> <![CDATA[τ 结霜量0-12 ]]> <![CDATA[τ 结霜量0-13 ]]> <![CDATA[τ 结霜量0-14 ]]> <![CDATA[[T 外管温度2 ,T 外管温度1 )]]> <![CDATA[τ 结霜量0-21 ]]> <![CDATA[τ 结霜量0-22 ]]> <![CDATA[τ 结霜量0-23 ]]> <![CDATA[τ 结霜量0-24 ]]> <![CDATA[[T 外管温度3 ,T 外管温度2 )]]> <![CDATA[τ 结霜量0-31 ]]> <![CDATA[τ 结霜量0-32 ]]> <![CDATA[τ 结霜量0-33 ]]> <![CDATA[τ 结霜量0-34 ]]> <![CDATA[(-∞,T 外管温度3 )]]> <![CDATA[τ 结霜量0-41 ]]> <![CDATA[τ 结霜量0-42 ]]> <![CDATA[τ 结霜量0-43 ]]> <![CDATA[τ 结霜量0-44 ]]>

[0104] In Table 2, T 外环0 T 外环1 T 外环2 T 外环3 The outdoor ambient temperature is the determining value, satisfying: -20℃ ≤ T 外环3 ≤T 外环2 ≤T 外环1 ≤T 外环0 ≤10℃, for example, T 外环3 = -15℃, T 外环2 = -10℃, T 外环1 = -5℃, T 外环0 =5℃; T 外管温度0 T 外管温度1 T 外管温度3 The outdoor heat exchanger tube temperature is the threshold value that satisfies: -40℃ ≤ T外管温度2 ≤T 外管温度2 ≤T 外管温度1 ≤T 外管温度0 ≤0℃, for example, T 外管温度0 =5℃, T 外管温度1 = -6℃, T 外管温度2 = -13℃, T 外管温度3 = -21℃; τ 结霜量0-i The second preset frosting amount corresponds to different outdoor ambient temperatures and outdoor heat exchanger tube temperatures, satisfying: τ 结霜量0-i ∈[0,10000g].

[0105] S13: In the frost suppression judgment stage, when the outdoor heat exchanger side operating conditions and frost layer parameters meet the second judgment condition, the frost suppression control stage is entered.

[0106] In this embodiment, the air conditioner can determine the timing for entering the defrost control stage after obtaining the operating conditions and frost layer parameters on the outdoor heat exchanger side. That is, the defrost control stage is entered when the operating conditions and frost layer parameters on the outdoor heat exchanger side meet the second judgment condition.

[0107] In one implementation of this embodiment, after obtaining the frost rate of the outdoor heat exchanger, the frost rate of the outdoor heat exchanger is monitored and the changes in the frost rate are judged. Then, the timing of entering the frost suppression control stage can be determined by combining the outdoor heat exchanger tube temperature and the compressor exhaust temperature.

[0108] Specifically, the frost control phase begins when all of the following conditions are met simultaneously:

[0109] Within a preset duration, the frosting rate decreases; the preset duration can be selected from [0, 20 min], for example, the preset duration is 2 min;

[0110] Outdoor heat exchanger tube temperature ≤ outdoor air dew point temperature + set dew point temperature;

[0111] Compressor exhaust temperature > preset exhaust temperature.

[0112] In this embodiment, the range of the dew point temperature value can be set to [-50℃, 0℃]. For example, the dew point temperature value is set to -15℃. The outdoor air dew point temperature is calculated or directly detected based on the current outdoor ambient temperature and outdoor ambient humidity.

[0113] In this embodiment, the preset exhaust temperature is determined based on the operating conditions of the outdoor heat exchanger. In one implementation of this embodiment, the outdoor heat exchanger operating conditions include the outdoor ambient temperature and outdoor ambient humidity. The preset exhaust temperature is determined based on the outdoor ambient temperature and outdoor ambient humidity. For example, the air conditioner pre-stores a third mapping table of outdoor ambient temperature, outdoor ambient humidity, and preset exhaust temperature, as shown in Table 3 below. The preset exhaust temperature corresponding to the current outdoor ambient temperature and current outdoor ambient humidity can be determined based on this third mapping table.

[0114] Table 3. Third Mapping Relationship between Outdoor Ambient Temperature, Outdoor Ambient Humidity, and Preset Exhaust Temperature

[0115] <![CDATA[T 排气0 ]]> <![CDATA[(-∞,T 外环3 )]]> <![CDATA[[T 外环3 ,T 外环2 )]]> <![CDATA[[T 外环2 ,T 外环1 )]]> <![CDATA[[T 外环1 ,T 外环0 ]]]> <![CDATA[[RH 外环0 ,RH 外环1 )]]> <![CDATA[T 排气0-11 ]]> <![CDATA[T 排气0-12 ]]> <![CDATA[T 排气0-13 ]]> <![CDATA[T 排气0-14 ]]> <![CDATA[[RH 外环1 ,RH 外环2 )]]> <![CDATA[T 排气0-21 ]]> <![CDATA[T 排气0-22 ]]> <![CDATA[T 排气0-23 ]]> <![CDATA[T 排气0-24 ]]> <![CDATA[[RH 外环2 ,100%]]]> <![CDATA[T 排气0-31 ]]> <![CDATA[T 排气0-32 ]]> <![CDATA[T 排气0-33 ]]> <![CDATA[T 排气0-34 ]]>

[0116] In Table 3, RH 外环0 RH 外环1 RH 外环2 The outdoor ambient temperature is the determining value, satisfying: 0 ≤ RH 外环0 ≤RH 外环1 ≤RH 外环2 ≤100%, for example, RH 外环0 =50%, RH 外环1 =75%, RH 外环2 =85%; T 外环0 T 外环1 T 外环2 T 外环3 The outdoor ambient temperature is the determining value, satisfying: -20℃ ≤ T 外环3 ≤T 外环2 ≤T 外环1 ≤T 外环0 ≤10℃, for example, T 外环3 = -15℃, T 外环2 = -10℃, T 外环1 = -5℃, T 外环0 =6℃; T 排气0-i The preset exhaust temperature is set for different outdoor ambient temperatures and humidity levels, satisfying: T 排气0-i ∈[0,100℃].

[0117] In another implementation of this embodiment, the operating condition on the outdoor heat exchanger side is the outdoor ambient temperature, and the preset exhaust temperature is determined based on the outdoor ambient temperature. For example, the air conditioner pre-stores a fourth mapping table of outdoor ambient temperature and preset exhaust temperature, as shown in Table 4 below. The preset exhaust temperature corresponding to the outdoor ambient temperature can be determined based on this fourth mapping table.

[0118] Table 4. Fourth Mapping Relationship between Outdoor Ambient Temperature and Preset Exhaust Temperature

[0119] <![CDATA[T 外环 ]]> <![CDATA[(-∞,T 外环3 )]]> <![CDATA[[T 外环3 ,T 外环2 )]]> <![CDATA[[T 外环2 ,T 外环1 )]]> <![CDATA[[T 外环1 ,T 外环0 ]]]> <![CDATA[T 排气0 ]]> <![CDATA[T 排气0-1 ]]> <![CDATA[T 排气0-2 ]]> <![CDATA[T 排气0-3 ]]> <![CDATA[T 排气0-4 ]]>

[0120] In Table 4, T 外环0 T 外环1 T 外环2 T 外环3 The outdoor ambient temperature is the determining value, satisfying: -20℃ ≤ T 外环3 ≤T 外环2 ≤T 外环1 ≤T 外环0 ≤10℃, for example, T 外环3 = -15℃, T 外环2 = -10℃, T 外环1 = -5℃, T 外环0 =6℃; T 排气0-i The preset exhaust temperature is set for different outdoor ambient temperatures and humidity levels, satisfying: T 排气0-i ∈[0,100℃].

[0121] Optionally, the system enters the defrost control phase after the outdoor heat exchanger side operating conditions and frost layer parameters meet the second judgment condition. In this embodiment, after the air conditioner enters the defrost control phase, the system operating parameters are corrected based on the defrost parameters.

[0122] Figure 2 This is a schematic flowchart of an air conditioner defrosting control method according to an embodiment of the present invention. (Refer to...) Figure 2 The control method in this embodiment also includes

[0123] S21: Real-time calculation of anti-frost parameters;

[0124] In this embodiment, the defrosting parameter is related to the current frosting rate of the outdoor heat exchanger, the outdoor ambient temperature, and the outdoor heat exchanger tube temperature. In one implementation of this embodiment, the defrosting parameter is a function of the outdoor heat exchanger side operating conditions, the outdoor heat exchanger tube temperature, the current cumulative frosting amount, and the current frosting rate. For example, Where, λ 抑霜参数 Let λ be the anti-frost parameter, where 0 ≤ λ 抑霜参数 ≤1; ν 当前结霜速率 τ is the current frosting rate; ε is a constant, with a possible value range of [0,1]. An example ε is 0.35, or its value can be determined based on the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the current cumulative frosting amount, and the current frosting rate; 当前累积结霜量 This represents the current cumulative frost level; T 外环 Outdoor ambient temperature; T 室外换热器管温 This refers to the temperature of the outdoor heat exchanger tubes.

[0125] S22: Correct the system temperature parameters based on the defrosting parameters.

[0126] In this embodiment, the system target temperature parameter is a function of the defrosting parameter and the current system temperature parameter, i.e., T. 系统目标温度参数 =F(T) 系统当前温度参数 , λ 抑霜参数 ); and / or, T 系统目标温度参数 =a×T 系统当前温度参数 +λ 抑霜参数 ; and / or, T 系统目标温度参数 =λ 抑霜参数 ×T 系统当前温度参数 +b, where T 系统目标温度参数 T represents the system's target temperature parameter. 系统当前温度参数 λ represents the current system temperature parameter. 抑霜参数 For defrosting parameters; 'a' is a constant, with a selectable value range of (0,2], for example, a is 1; 'b' is a constant, with a selectable value range of [-10℃,10℃], for example, b is 1.5℃; or 'a' and 'b' are determined based on the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the current accumulated frost amount, and the current frost rate. The corrected T 系统目标温度参数 ≥T 系统当前温度参数 Because the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the amount of frost, the frost rate, and system temperature parameters all change in real time under frost conditions, the frost suppression parameter λ is adjusted after entering frost suppression control. 抑霜参数 and T 目标蒸发温度 This is a real-time, dynamically changing quantity. The current system temperature parameter is at least one of the following: the current system evaporation temperature, the compressor suction temperature, and the compressor discharge temperature. The evaporation temperature refers to the saturation temperature corresponding to the low pressure of the refrigeration system, which can generally be obtained by correcting for the evaporator tube temperature.

[0127] S23: Correct the opening degree of the electronic expansion valve.

[0128] In one implementation of this embodiment, the current opening degree of the electronic expansion valve is corrected based on the current system temperature parameter and the system target temperature parameter.

[0129] Figure 3 This is a schematic flowchart of an air conditioner defrosting control method according to an embodiment of the present invention. (Refer to...) Figure 3 The steps for correcting the current opening degree of the electronic expansion valve based on the current system temperature parameters and the target system temperature parameters include:

[0130] S31: Determine the electronic expansion valve correction value based on the current system temperature parameter and the target system temperature parameter; for example, the electronic expansion valve correction value is a function of the current system temperature parameter and the target system temperature parameter, and / or, ΔP = K 抑霜开度系数 ×(T 系统目标温度参数 -T 系统当前温度参数 ), where: △P is the correction value of the electronic expansion valve; K抑霜开度系数 K is a constant, and its value range can be [0, 50]. For example, K... 抑霜开度系数 K is 2.0, or determined based on the current cumulative frost amount and the current frost rate. 抑霜开度系数 The size, for example, based on the pre-stored frost amount in the air conditioner - frost rate - K. 抑霜开度系数 The seventh mapping table is used to determine K 抑霜开度系数 Size; T 系统目标温度参数 T represents the system's target temperature parameter. 系统当前温度参数 This is the current temperature parameter of the system.

[0131] S32: Determine the target opening of the electronic expansion valve based on its current opening and correction value. The target opening of the electronic expansion valve satisfies: P 目标开度 =P 当前开度 +△P, where: P 目标开度 P represents the target opening degree of the electronic expansion valve. 当前开度 ΔP represents the current opening degree of the electronic expansion valve; ΔP represents the correction value of the electronic expansion valve.

[0132] In another implementation of this embodiment, the current opening of the electronic expansion valve is corrected based on the defrosting parameter. For example, the target opening of the electronic expansion valve is a function of the defrosting parameter and the current opening of the electronic expansion valve, and / or, P 目标开度 =λ 抑霜参数 ×P 当前开度 +c, and / or, P 目标开度 =d×P 当前开度 +λ 抑霜参数 Wherein: P 目标开度 P represents the target opening degree of the electronic expansion valve. 当前开度 λ represents the current opening degree of the electronic expansion valve. 抑霜参数 Here are the anti-frost parameters; c is a constant, with a possible value range of [-30P, 30P], for example, b is 5P; d is a constant, with a possible value range of (0, 2], for example, a is 1.

[0133] In the heating mode, this invention monitors the real-time frost amount and frost rate during the heating process, and determines the timing for frost suppression control by combining the current operating parameters and system operating parameters. Based on the real-time calculated dynamic frost suppression parameters, the air conditioner operating parameters are adjusted in real time to ensure the timeliness and efficiency of frost suppression in the air conditioner system.

[0134] This embodiment also discloses a control device for an air conditioner, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions. When the one or more processors execute the program instructions, the one or more processors are used to implement the above-described defrost control method.

[0135] This embodiment also discloses an air conditioner that employs the above-described defrosting control method or includes the above-described control device.

[0136] In the different embodiments provided by this invention, the same parameters, terms, logic, etc. should be understood to have the same meaning, and this application does not intentionally repeat the description in each embodiment.

[0137] Exemplary embodiments of the present disclosure have been specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, arrangements, or implementation methods described herein; rather, the present disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A defrosting control method for an air conditioner, characterized in that, The air conditioner includes a defrost detection stage and a defrost control stage, and the control method includes: In heating mode, the operating conditions of the outdoor heat exchanger, system operating parameters, and frost layer parameters of the outdoor heat exchanger are obtained. When the outdoor heat exchanger side operating conditions, the system operating parameters, and the frost layer parameters meet the first judgment condition, the frost suppression judgment stage is entered. During the defrost suppression judgment phase, when the outdoor heat exchanger side operating conditions, the system operating parameters, and the frost layer parameters meet the second judgment condition, the defrost suppression control phase is initiated. Wherein, the outdoor heat exchanger side operating conditions include outdoor ambient temperature and outdoor ambient humidity, or the outdoor heat exchanger side operating conditions are outdoor ambient temperature; the system operating parameters include heating operation duration, outdoor heat exchanger tube temperature and compressor exhaust temperature; the frost layer parameters include the cumulative frost amount and frost rate of the outdoor heat exchanger. The control method further includes: during the defrosting control phase, correcting the system operating parameters based on the defrosting parameters; the defrosting parameters are functions of the outdoor heat exchanger side operating conditions, the outdoor heat exchanger tube temperature, the current cumulative frost amount, and the current frost rate.

2. The defrosting control method for an air conditioner according to claim 1, characterized in that, When the outdoor heat exchanger side operating conditions include outdoor ambient temperature and outdoor ambient humidity, the step of entering the defrosting judgment stage when the outdoor heat exchanger side operating conditions, the system operating parameters, and the frost layer parameters meet the first judgment condition includes: The anti-frost determination stage is entered when all of the following conditions are met simultaneously: The outdoor ambient temperature is less than or equal to the first preset temperature. The heating operation duration is greater than or equal to the first preset duration; The outdoor ambient humidity is greater than or equal to the preset humidity. The cumulative frost amount is greater than or equal to the first preset frost amount.

3. The defrosting control method for an air conditioner according to claim 2, characterized in that, The cumulative frost amount is the frost layer mass, and the size of the first preset frost amount is determined based on the outdoor ambient temperature and the outdoor ambient humidity. Alternatively, the cumulative frost amount is the frost layer thickness, and the first preset frost amount is a constant.

4. The defrosting control method for an air conditioner according to claim 3, characterized in that, Determining the first preset frost amount based on the outdoor ambient temperature and the outdoor ambient humidity includes: The air conditioner has a first mapping table pre-stored for outdoor ambient temperature, outdoor ambient humidity and first preset frost amount. The first preset frost amount corresponding to the current outdoor ambient temperature and the current outdoor ambient humidity is determined according to the first mapping table.

5. The defrosting control method for an air conditioner according to claim 1, characterized in that, When the outdoor heat exchanger side operating condition is the outdoor ambient temperature, and the outdoor heat exchanger side operating condition, the system operating parameters, and the frost layer parameters meet the first judgment condition, the process enters the anti-frost judgment stage, including: The anti-frost determination stage is entered when all of the following conditions are met simultaneously: The outdoor ambient temperature is less than or equal to the second preset temperature. The heating operation duration is greater than or equal to the second preset duration; The cumulative frost amount is greater than or equal to the second preset frost amount.

6. The defrosting control method for an air conditioner according to claim 5, characterized in that, The cumulative frost amount is the frost layer mass, and the second preset frost amount is determined based on the outdoor ambient temperature and the outdoor heat exchanger tube temperature. Alternatively, the cumulative frost amount is the frost layer thickness, and the second preset frost amount is a constant.

7. The defrosting control method for an air conditioner according to claim 6, characterized in that, The implementation of determining the second preset frosting amount based on the outdoor ambient temperature and the outdoor heat exchanger tube temperature includes: The air conditioner has a second mapping table pre-stored for outdoor ambient temperature, outdoor heat exchanger pipe temperature and second preset frost amount. The second preset frost amount corresponding to the current outdoor ambient temperature and the current outdoor heat exchanger pipe temperature is determined according to the second mapping table.

8. The defrosting control method for an air conditioner according to claim 1, characterized in that, When the outdoor heat exchanger side operating conditions, the system operating parameters, and the frost layer parameters meet the second judgment condition, the process enters the frost suppression control stage, including: The anti-frost control phase is entered when all of the following conditions are met simultaneously: The frosting rate decreases over a preset duration. The outdoor heat exchanger tube temperature is ≤ outdoor air dew point temperature + set dew point temperature value; The compressor exhaust temperature is greater than the preset exhaust temperature.

9. A defrosting control method for an air conditioner according to claim 8, characterized in that, When the operating conditions of the outdoor heat exchanger include outdoor ambient temperature and outdoor ambient humidity, the preset exhaust temperature is determined based on the outdoor ambient temperature and the outdoor ambient humidity.

10. A defrosting control method for an air conditioner according to claim 9, characterized in that, The air conditioner has a third mapping table pre-stored for outdoor ambient temperature, outdoor ambient humidity, and preset exhaust temperature. The preset exhaust temperature corresponding to the current outdoor ambient temperature and current outdoor ambient humidity is determined according to the third mapping table.

11. The defrosting control method for an air conditioner according to claim 9, characterized in that, When the operating condition of the outdoor heat exchanger side is the outdoor ambient temperature, the preset exhaust temperature is determined based on the outdoor ambient temperature.

12. The defrosting control method for an air conditioner according to claim 11, characterized in that, Determining the preset exhaust temperature based on the outdoor ambient temperature includes: The air conditioner has a fourth mapping table pre-stored for outdoor ambient temperature and preset exhaust temperature. The preset exhaust temperature corresponding to the current outdoor ambient temperature is determined according to the fourth mapping table.

13. The defrosting control method for an air conditioner according to claim 1, characterized in that, The anti-frost parameter satisfies the following formula: ， in, For anti-frost parameters, 0≤ ≤1; ν 结霜速率 This represents the current frosting rate; ε is a constant, or its magnitude can be determined based on the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the current cumulative frost amount, and the current frost rate; τ 结霜量 This represents the current cumulative frost level; T 外环 Outdoor ambient temperature; T 室外换热器管温 This refers to the temperature of the outdoor heat exchanger tubes.

14. The defrosting control method for an air conditioner according to claim 13, characterized in that, The correction of system operating parameters based on defrosting parameters includes: The system's current temperature parameter is corrected based on the defrost suppression parameter, and the target system temperature parameter is a function of the defrost suppression parameter and the current system temperature parameter. Or, T 系统目标温度参数 =a×T 系统当前温度参数 +λ 抑霜参数 ; Or, T 系统目标温度参数 =λ 抑霜参数 ×T 系统当前温度参数 +b; Among them, T 系统目标温度参数 T represents the system's target temperature parameter. 系统当前温度参数 This refers to the current system temperature parameter. These are the defrosting parameters; a and b are constants, or their values ​​can be determined based on the difference between the outdoor ambient temperature and the outdoor heat exchanger tube temperature, the current cumulative frost amount, and the current frost rate.

15. A defrosting control method for an air conditioner according to claim 14, characterized in that, After correcting the current system temperature parameters, the correction of system operating parameters based on defrosting parameters further includes: The current opening degree of the electronic expansion valve is corrected based on the current system temperature parameters and the target system temperature parameters.

16. A defrosting control method for an air conditioner according to claim 15, characterized in that, The step of correcting the current opening degree of the electronic expansion valve based on the current system temperature parameter and the target system temperature parameter includes: The correction value for the electronic expansion valve is determined based on the current temperature parameters of the system and the target temperature parameters of the system. The target opening of the electronic expansion valve is determined based on the current opening and the correction value of the electronic expansion valve. The target opening of the electronic expansion valve satisfies: P 目标开度 =P 当前开度 +△P; Where: P 目标开度 P represents the target opening degree of the electronic expansion valve. 当前开度 ΔP represents the current opening degree of the electronic expansion valve; ΔP represents the correction value of the electronic expansion valve.

17. A defrosting control method for an air conditioner according to claim 16, characterized in that, The step of determining the electronic expansion valve correction value based on the current system temperature parameter and the target system temperature parameter includes: The correction value of the electronic expansion valve is a function of the current system temperature parameter and the target system temperature parameter, or... △P=K 抑霜开度系数 ×(T 系统目标温度参数 -T 系统当前温度参数 ), among which: △P is the correction value for the electronic expansion valve; K 抑霜开度系数 K is a constant, or determined based on the current cumulative frost amount and the current frost rate. 抑霜开度系数 Size; T 系统目标温度参数 T represents the system's target temperature parameter. 系统当前温度参数 This is the current temperature parameter of the system.

18. A defrosting control method for an air conditioner according to any one of claims 14-17, characterized in that, The current temperature parameter of the system is at least one of the current evaporation temperature of the system, the suction temperature of the compressor, and the discharge temperature of the compressor.

19. A defrosting control method for an air conditioner according to claim 1, characterized in that, The method of correcting system operating parameters based on defrosting parameters also includes: The current opening of the electronic expansion valve is corrected based on the anti-frost parameter. The target opening of the electronic expansion valve is a function of the anti-frost parameter and the current opening of the electronic expansion valve. Or, P 目标开度 =λ 抑霜参数 ×P 当前开度 +c, Or, P 目标开度 =d×P 当前开度 +λ 抑霜参数 ; Where: P 目标开度 P represents the target opening degree of the electronic expansion valve. 当前开度 λ represents the current opening degree of the electronic expansion valve. 抑霜参数 is the frost suppression parameter; c is a constant; d is a constant.

20. A control device for an air conditioner, characterized in that, It includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, wherein when the one or more processors execute the program instructions, the one or more processors are used to implement the frost suppression control method according to any one of claims 1-19.

21. An air conditioner, characterized in that, It employs the frost suppression control method described in any one of claims 1-19, or includes the control device described in claim 20.

Images