CN115076905A - Defrosting control method and device and air conditioner - Google Patents

Abstract

The embodiment of the invention provides a defrosting control method and device and an air conditioner, and relates to the technical field of air conditioners. The method comprises the following steps: firstly, when the air conditioner is started and runs for a set length, detecting the initial evaporator coil temperature, the initial indoor unit air outlet temperature and the initial outdoor environment temperature, and detecting the current evaporator coil temperature, the current indoor unit temperature and the current outdoor environment temperature according to a preset time interval. Then, the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the air outlet temperature of the indoor unit and the change value of the outdoor environment temperature are respectively calculated, and defrosting control is carried out on the air conditioner according to the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the air outlet temperature of the indoor unit and the change value of the outdoor environment temperature. The defrosting control is more accurate due to the fact that the evaporator judgment temperature, the indoor unit air outlet temperature and the outdoor environment temperature are integrated.

Description

Defrost control method, device and air conditioner

technical field

The present invention relates to the technical field of air conditioners, and in particular, to a defrosting control method and device, and an air conditioner.

Background technique

For fixed-frequency air conditioners on the market, an inner disk temperature sensor is generally installed in the evaporator of the indoor unit of the air conditioner to detect the coil temperature of the evaporator. When the fixed-frequency air conditioner is in cooling operation, it is determined whether the indoor unit of the air conditioner is full of frost by detecting whether the temperature of the inner plate of the evaporator is attenuated and how much it is attenuated, and whether the defrosting control of the evaporator needs to be performed.

However, changes in the outdoor environment will cause changes in the temperature of the indoor unit evaporator coil. When the air conditioner is in cooling operation, if the outdoor ambient temperature drops sharply due to weather, the temperature of the evaporator coil will also drop sharply. At this time, it may happen that the evaporator of the indoor unit is not frosted, but the air conditioner enters the defrost control, which affects the use of the air conditioner.

SUMMARY OF THE INVENTION

The objects of the present invention include, for example, to provide a defrosting control method, device and air conditioner, which can detect the temperature of the evaporator coil of the air conditioner, the outlet air temperature of the indoor unit and the outdoor ambient temperature, and determine the temperature according to the temperature of the evaporator coil. The attenuation of the tube temperature, the attenuation of the outlet air temperature of the indoor unit and the change of the outdoor ambient temperature are used to control the defrost of the air conditioner, making the defrost control more accurate.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present invention are as follows:

In a first aspect, an embodiment of the present invention provides a defrost control method, the defrost control method comprising:

When the air conditioner is turned on and runs for a set period of time, the initial evaporator coil temperature, the initial indoor unit outlet air temperature and the initial outdoor ambient temperature are detected;

According to the preset time interval, detect the current evaporator coil temperature, the current indoor unit outlet air temperature and the current outdoor ambient temperature;

Calculate the initial evaporator coil temperature and the current evaporator coil temperature, the initial indoor unit outlet air temperature and the current indoor unit outlet air temperature, the initial outdoor ambient temperature and the current outdoor ambient temperature, respectively. The difference in temperature can be used to obtain the attenuation of the evaporator coil temperature, the attenuation of the outlet air temperature of the indoor unit, and the change of the outdoor ambient temperature;

Defrost control is performed on the air conditioner according to the initial outdoor ambient temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, and the change value of the outdoor ambient temperature.

Compared with the prior art, in the defrosting control method provided in this embodiment, first, when the air conditioner is turned on and running for a set period of time, the initial evaporator coil temperature, the initial indoor unit outlet air temperature and the initial outdoor ambient temperature are detected, and the temperature is determined according to the Preset time interval to detect the current evaporator coil temperature, current indoor unit temperature and current outdoor ambient temperature. Then calculate the attenuation degree of evaporator coil temperature, the attenuation degree of indoor unit outlet air temperature and the change value of outdoor ambient temperature respectively. The temperature change value is used to defrost the air conditioner. Because the judgment temperature of the evaporator, the outlet air temperature of the indoor unit and the outdoor ambient temperature are combined, the defrost control is more accurate.

In a possible implementation manner, according to the initial outdoor ambient temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, and the change value of the outdoor ambient temperature, The step of defrosting control for the air conditioner includes:

If the initial outdoor ambient temperature is greater than or equal to the first set temperature, according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the change value of the outdoor ambient temperature and the first A relationship between a preset temperature difference, defrosting control is performed on the air conditioner;

If the initial outdoor ambient temperature is less than the first set temperature and greater than or equal to the second set temperature, according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the performing defrosting control on the air conditioner according to the relationship between the change value of the outdoor ambient temperature and the second preset temperature difference;

If the initial outdoor ambient temperature is lower than the second set temperature, then according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the change value of the outdoor ambient temperature and the first Defrost control is performed on the air conditioner according to the relationship between the three preset temperature differences;

The first preset temperature difference is greater than the second preset temperature difference, and the second preset temperature difference is greater than the third preset temperature difference.

In a possible implementation manner, the change value according to the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the outlet air temperature of the indoor unit and the change value of the outdoor ambient temperature and the first preset temperature difference relationship, the steps of defrosting control for the air conditioner include:

comparing the attenuation of the evaporator coil temperature with the first preset temperature difference;

If the degree of attenuation of the evaporator coil temperature is greater than the first preset temperature difference, increase the current speed of the indoor fan by the first preset speed, and compare the output of the indoor unit after a first set period of time. The attenuation of the wind temperature is different from the first preset temperature;

If the attenuation of the outlet air temperature of the indoor unit is greater than the first preset temperature difference, continue to increase the current speed of the indoor fan by the first preset speed, and after the first set time period, comparing the change value of the outdoor ambient temperature with the first preset temperature difference;

If the change value of the outdoor ambient temperature is greater than the first preset temperature difference, the air conditioner is controlled to defrost.

In a possible implementation manner, the change value according to the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the outlet air temperature of the indoor unit and the change value of the outdoor ambient temperature and the first preset temperature difference relationship, the step of defrosting control for the air conditioner further includes:

If the degree of attenuation of the evaporator coil temperature is not greater than the first preset temperature difference, controlling the air conditioner to operate with the current parameters;

If the attenuation of the outlet air temperature of the indoor unit is not greater than the first preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the first preset time period, it returns to perform the comparison. The steps of the attenuation of the outlet air temperature of the indoor unit and the first preset temperature difference;

If the change value of the outdoor ambient temperature is not greater than the first preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the first set period of time, it returns to perform the comparison of the outdoor The step of changing the value of the ambient temperature and the first preset temperature difference.

In a possible implementation manner, the change value according to the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the outlet air temperature of the indoor unit and the change value of the outdoor ambient temperature and the second preset temperature difference relationship, the steps of defrosting control for the air conditioner include:

comparing the attenuation of the evaporator coil temperature with the second preset temperature difference;

If the degree of attenuation of the evaporator coil temperature is greater than the second preset temperature difference, increase the current speed of the indoor fan by a second preset speed, and compare the indoor fan after a second preset time period. The attenuation of the outlet air temperature of the machine is different from the second preset temperature;

Wherein, the second preset rotation speed is higher than the first preset rotation speed, and the second preset duration is shorter than the first preset duration;

If the attenuation of the outlet air temperature of the indoor unit is greater than the second preset temperature difference, continue to increase the current speed of the indoor fan by the second preset speed, and after the second set time period, comparing the change value of the outdoor ambient temperature with the second preset temperature difference;

If the change value of the outdoor ambient temperature is greater than the second preset temperature difference, the air conditioner is controlled to defrost.

In a possible implementation manner, the change value according to the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the outlet air temperature of the indoor unit and the change value of the outdoor ambient temperature and the second preset temperature difference relationship, the step of defrosting control for the air conditioner further includes:

If the degree of attenuation of the evaporator coil temperature is not greater than the second preset temperature difference, controlling the air conditioner to operate with the current parameters;

If the degree of attenuation of the outlet air temperature of the indoor unit is not greater than the second preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the second preset time period, it returns to perform the comparison. The step of the attenuation degree of the indoor unit outlet air temperature and the second preset temperature difference;

If the change value of the outdoor ambient temperature is not greater than the second preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the second preset time period, return to performing the comparison of the outdoor environment The step of changing the value of the ambient temperature and the second preset temperature difference.

In a possible implementation manner, the change value according to the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the outlet air temperature of the indoor unit, and the change value of the outdoor ambient temperature and a third preset temperature difference relationship, the steps of defrosting control for the air conditioner include:

comparing the attenuation of the evaporator coil temperature with the third preset temperature difference;

If the degree of attenuation of the evaporator coil temperature is greater than the third preset temperature difference, increase the current rotation speed of the indoor fan by a third preset rotation speed, and after a third preset time period, compare the indoor fan The attenuation of the outlet air temperature of the machine is different from the third preset temperature;

Wherein, the third preset rotation speed is higher than the second preset rotation speed, and the third preset duration is shorter than the second preset duration;

If the attenuation of the outlet air temperature of the indoor unit is greater than the third preset temperature difference, continue to increase the current speed of the indoor fan by the third preset speed, and after the third set time period, comparing the change value of the outdoor ambient temperature with the third preset temperature difference;

If the change value of the outdoor ambient temperature is greater than the third preset temperature difference, the air conditioner is controlled to defrost.

In a possible implementation manner, the change value according to the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the outlet air temperature of the indoor unit, and the change value of the outdoor ambient temperature and a third preset temperature difference relationship, the step of defrosting control for the air conditioner further includes:

If the degree of attenuation of the evaporator coil temperature is not greater than the third preset temperature difference, controlling the air conditioner to operate with the current parameters;

If the degree of attenuation of the outlet air temperature of the indoor unit is not greater than the third preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the third preset time period, it returns to perform the comparison. The step of the attenuation degree of the indoor unit outlet air temperature and the third preset temperature difference;

If the change value of the outdoor ambient temperature is not greater than the third preset temperature difference, the air conditioner is controlled to operate at the current parameters, and after the third preset time period, return to performing the comparison of the outdoor environment The step of changing the value of the ambient temperature and the third preset temperature difference.

In a second aspect, an embodiment of the present invention also provides a defrost control device, the defrost control device comprising:

Detection module for:

When the air conditioner is turned on and runs for a set period of time, the initial evaporator coil temperature, the initial indoor unit outlet air temperature and the initial outdoor ambient temperature are detected;

According to the preset time interval, detect the current evaporator coil temperature, the current indoor unit outlet air temperature and the current outdoor ambient temperature;

The calculation module is used to calculate the initial evaporator coil temperature and the current evaporator coil temperature, the initial indoor unit outlet air temperature and the current indoor unit outlet air temperature, the initial outdoor ambient temperature and The difference of the current outdoor ambient temperature is obtained to obtain the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, and the change value of the outdoor ambient temperature;

A control module, configured to perform a control operation on the air conditioner according to the initial outdoor ambient temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, and the change value of the outdoor ambient temperature. Defrost control.

In a third aspect, an embodiment of the present invention further provides an air conditioner, the air conditioner comprising:

one or more processors;

A memory for storing one or more programs, which when executed by the one or more processors, enables the one or more processors to implement the above defrost control method.

Compared with the prior art, the embodiments of the present invention provide a defrosting control method, device, and air conditioner. The method includes: first, when the air conditioner is turned on for a set period of time, detecting the initial evaporator coil temperature, the initial indoor unit output Wind temperature and initial outdoor ambient temperature, and detect the current evaporator coil temperature, current indoor unit temperature and current outdoor ambient temperature at preset time intervals. Then, calculate the attenuation degree of evaporator coil temperature, the attenuation degree of indoor unit outlet air temperature and the change value of outdoor ambient temperature respectively, and calculate the attenuation degree of evaporator coil temperature, indoor unit outlet air temperature attenuation degree and outdoor temperature according to the The change value of the ambient temperature is used to control the defrost of the air conditioner. Because the judgment temperature of the evaporator, the outlet air temperature of the indoor unit and the outdoor ambient temperature are combined, the defrost control is more accurate.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of the installation of an inner disk temperature sensor package provided by an embodiment of the present invention.

FIG. 2 is a schematic flowchart of a defrosting control method according to an embodiment of the present invention.

FIG. 3 is an example diagram of a defrosting control method provided by an embodiment of the present invention.

FIG. 4 is a schematic block diagram of a defrosting control device according to an embodiment of the present invention.

FIG. 5 is a schematic block diagram of an air conditioner according to an embodiment of the present invention.

Icon: 100-air conditioner; 101-memory; 102-processor; 103-evaporator coil temperature sensor; 104-indoor air temperature sensor; 105-outdoor ambient temperature sensor; 200-chemical Frost control device; 201-detection module; 202-calculation module; 203-control module.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.

It should be noted that the features in the embodiments of the present invention may be combined with each other without conflict.

For fixed-frequency air conditioners on the market, an inner disk temperature sensor is generally installed on the evaporator of the indoor unit of the air conditioner to detect the coil temperature of the evaporator. As shown in Figure 1, it is a schematic diagram of the installation of the inner disk temperature sensor package. When the fixed-frequency air conditioner is in cooling operation, the inner disk temperature sensor in Figure 1 is used to detect whether the coil temperature of the evaporator is attenuated, and how much the attenuation is, to determine whether the indoor unit of the air conditioner is full of frost and whether it needs to be defrosted. control.

However, due to changes in the outdoor environment, the temperature of the indoor unit evaporator coil will change. When the air conditioner is in cooling operation, if the outdoor ambient temperature drops sharply due to weather, the temperature of the evaporator coil will also drop sharply. At this time, it may happen that the evaporator of the indoor unit is not frosted, but the air conditioner enters the defrost control, which affects the use of the air conditioner.

In order to solve the above problems, the present embodiment provides a defrosting control method. By detecting the temperature of the evaporator coil of the air conditioner, the outlet air temperature of the indoor unit and the outdoor ambient temperature, and according to the attenuation of the evaporator coil temperature, the indoor unit temperature The attenuation of the outlet air temperature and the change value of the outdoor ambient temperature are used to control the defrost of the air conditioner, making the defrost control more accurate.

Details are given below.

Please refer to FIG. 2. FIG. 2 shows the flow of the defrosting control method provided by this embodiment. The defrosting control method may include the following steps S110-S140.

S110, when the air conditioner is turned on and runs for a set period of time, the initial evaporator coil temperature, the initial indoor unit outlet air temperature, and the initial outdoor ambient temperature are detected.

In this embodiment, due to the prior art, the inner disk temperature sensing package is welded on the evaporator by spot welding, as shown in FIG. 1 . If the welding position is offset, or there is too little solder, so that the temperature sensor does not have sufficient contact with the evaporator, the detected temperature value of the evaporator coil will be distorted, and the indoor unit of the air conditioner cannot be defrosted in time when it is frosted.

Therefore, in order to overcome the above problems, in the defrosting control method provided in this embodiment, the temperature sensing bulb of the evaporator coil is welded to the elbow of the evaporator, and the temperature sensing bulb of the evaporator coil is inserted into the casing. , which makes the detected evaporator coil temperature more accurate.

In addition, the air conditioner is also equipped with a temperature sensor bulb for the outlet air temperature of the indoor unit and a temperature sensor bulb for the outdoor ambient temperature. The temperature sensor package for the outlet air temperature of the indoor unit is installed at the air outlet of the indoor unit to detect the outlet air temperature of the indoor unit. The outdoor ambient temperature temperature sensor is installed at the air inlet of the outdoor unit to detect the outdoor ambient temperature.

The above set duration is set by technicians based on experience. When the air conditioner is turned on for the set duration, the control of the air conditioner tends to be stable. At this time, various temperature data can be detected and controlled. For example, the set time period can be 30 minutes.

S120, according to a preset time interval, detect the current evaporator coil temperature, the current indoor unit outlet air temperature, and the current outdoor ambient temperature.

In this embodiment, the preset time interval is set by a technician according to experience, for example, the preset time interval is 10 minutes.

S130: Calculate the difference between the initial evaporator coil temperature and the current evaporator coil temperature, the initial indoor unit outlet air temperature and the current indoor unit outlet air temperature, and the initial outdoor ambient temperature and the current outdoor ambient temperature, to obtain the evaporator coil The attenuation of temperature, the attenuation of indoor unit outlet air temperature, and the change of outdoor ambient temperature.

In this embodiment, the initial evaporator coil temperature, the initial indoor unit outlet air temperature, and the initial outdoor ambient temperature are respectively represented by T _{coil initial} , T _{air outlet initial} , and T _{environment initial} ; the current evaporator coil temperature, the current indoor temperature The outlet air temperature of the unit and the current outdoor ambient temperature are represented by the current T _{coil, the current} T _{outlet and the current} T _environment respectively; the attenuation of the evaporator coil temperature, the attenuation of the indoor unit outlet temperature, and the change of the outdoor ambient temperature The values are represented by T _{coil attenuation} , T _{outlet wind attenuation} , and T _{environmental change} , respectively.

Then T _{coil attenuation} = T _{coil initial} - T _{coil current} , T _{wind attenuation} = T _{wind initial} - T _{wind current} , T _{environment change} = T _{environment initial} - T _{environment current} .

S140 , defrosting the air conditioner is controlled according to the initial outdoor ambient temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, and the change value of the outdoor ambient temperature.

Compared with the prior art, the defrosting control method provided in this embodiment detects the temperature of the evaporator coil, the outlet air temperature of the indoor unit, and the outdoor ambient temperature, and detects the attenuation of the evaporator coil temperature and the outlet air temperature of the indoor unit. Defrost control is performed on the air conditioner, which overcomes the problem in the prior art that the temperature of the evaporator coil decreases sharply due to the change of the outdoor ambient temperature, which causes the air conditioner to perform the defrost control by mistake. question. Since the evaporator coil temperature, indoor unit outlet air temperature and outdoor ambient temperature are comprehensively considered, the defrost control is more accurate.

Optionally, step S140 may include the following sub-steps S1401-S1403.

S1401, if the initial outdoor ambient temperature is greater than or equal to the first preset temperature, according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, and the change value of the outdoor ambient temperature and the first preset temperature difference The relationship between the defrost control of the air conditioner.

In this embodiment, both the first set temperature and the first preset temperature difference are set by technicians according to experience. For example, the first set temperature may be 20°C.

When the _{initial T environment} is greater than or equal to 20 °C, when the air conditioner is running in the cooling mode, the probability of the indoor unit frosting and the speed of frosting are very small. Therefore, when defrosting control is performed, defrosting control can be performed with the evaporator coil temperature as the detection core, and the first preset temperature difference can be set relatively large, for example, the first preset temperature difference can be 3°C.

S1402, if the initial outdoor ambient temperature is less than the first set temperature and greater than or equal to the second set temperature, according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the change value of the outdoor ambient temperature and The relationship between the second preset temperature difference is used for defrosting control of the air conditioner.

In this embodiment, the second set temperature and the second preset temperature difference are set by the technicians according to experience, and the second set temperature is lower than the first set temperature, for example, the second set temperature is 10°C.

When 20°C>T _initial ≥10°C, the air conditioner has a higher probability of frost formation in cooling mode, and the frost formation speed is also faster. Therefore, the second preset temperature difference may be set to a value smaller than the first preset temperature difference, for example, the second preset temperature difference may be 2°C.

S1403, if the initial outdoor ambient temperature is less than the second preset temperature, the relationship between the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature, the change value of the outdoor ambient temperature and the third preset temperature difference , defrost control of the air conditioner.

In this embodiment, when the 10°C>T _{environment is initially} , it means that the indoor unit has a high probability of frost formation when the air conditioner operates in the cooling mode, and the frost formation speed is also fast. Therefore, the third preset temperature difference may be set to a value smaller than the second preset temperature difference, for example, the second preset temperature difference is 2°C, and the third preset temperature difference is 1°C.

Optionally, step S1401 may include the following detailed steps S211-S214.

S211 , compare the attenuation degree of the evaporator coil temperature with the first preset temperature difference.

S212, if the degree of attenuation of the evaporator coil temperature is greater than the first preset temperature difference, increase the current speed of the indoor fan by the first preset speed, and compare the attenuation of the outlet air temperature of the indoor unit after the first preset time period degree and the first preset temperature difference.

In this embodiment, the first preset rotation speed and the first preset duration are set by technicians based on experience. For example, the first preset rotation speed may be 50 r/min, and the first preset duration may be 30 min.

_{Attenuation of the T coil is} >3°C, indicating that the evaporator of the air conditioner may be frosting. However, since the _{initial temperature of the T environment} is greater than or equal to 20°C, the frosting speed is slow at this time, and the current speed of the indoor fan can be increased by 50r/min. In order to increase the heat exchange air volume of the indoor unit and reduce the frosting speed of the air conditioner. And after 30 minutes, compare the T _{outlet air attenuation} and 3 ℃ to judge the frosting speed of the evaporator and whether it is necessary to adjust the speed of the indoor fan.

S213, if the attenuation of the outlet air temperature of the indoor unit is greater than the first preset temperature difference, continue to increase the current speed of the indoor fan by the first preset speed, and after the first preset time period, compare the change value of the outdoor ambient temperature and the first preset temperature difference.

If the T _{outlet air attenuation} is >3°C, it means that the evaporator of the air conditioner is still in a frosted state. At this time, you can continue to increase the current speed of the indoor fan by 50r/min to increase the heat exchange air volume of the indoor unit and reduce the air conditioner. frosting speed. And after 30min, compare the _{change of T environment} and 3℃ to judge whether the evaporator is full of frost, and defrost when it is full of frost.

S214, if the change value of the outdoor ambient temperature is greater than the first preset temperature difference, control the air conditioner to defrost.

In this embodiment, if the T _{environment changes} >3°C, the compressor and the indoor fan are controlled to stop running, and the outdoor fan is controlled to keep running at the current speed, so as to defrost the air conditioner.

Optionally, step S1401 may further include the following steps S215-S217.

S215 , if the degree of attenuation of the evaporator coil temperature is not greater than the first preset temperature difference, control the air conditioner to operate with the current parameters, and return to step S211 after the first set time period.

S216, if the attenuation of the indoor unit outlet air temperature is not greater than the first preset temperature difference, control the air conditioner to operate with the current parameters, and after the first preset time period, return to performing the comparison of the indoor unit outlet air temperature in step S212 The step of the attenuation degree and the first preset temperature difference.

S217, if the change value of the outdoor ambient temperature is not greater than the first preset temperature difference, control the air conditioner to operate with the current parameters, and after the first set time period, return to the execution in step S213 to compare the change value of the outdoor ambient temperature with the The first step of presetting the temperature difference.

Optionally, step S1402 may include the following detailed steps S311-S314.

S311 , compare the attenuation degree of the evaporator coil temperature with the second preset temperature difference.

S312, if the degree of attenuation of the evaporator coil temperature is greater than the second preset temperature difference, increase the current speed of the indoor fan by the second preset speed, and compare the attenuation of the outlet air temperature of the indoor unit after the second preset time period degree and the second preset temperature difference.

In this embodiment, the second preset rotational speed and the second set duration are set by a technician according to experience. Since 20°C>T _initial ≥10°C, the evaporator of the air conditioner may have a faster frosting speed. The second preset speed can be set higher than the first preset speed, and the second preset time length is shorter than the first preset speed. The duration, for example, the second preset rotational speed may be 100r/min, and the second preset duration may be 20min.

That is, when 20°C>T _initial ≥10°C, if the T _{coil attenuation is} >2°C, increase the current speed of the indoor fan by 100r/min, and after 20min, compare the T _{outlet air attenuation} and 2°C, To judge the frosting speed of the evaporator and whether it is necessary to adjust the speed of the indoor fan.

S313, if the attenuation of the air outlet temperature of the indoor unit is greater than the second preset temperature difference, continue to increase the current speed of the indoor fan by the second preset speed, and compare the change value of the outdoor ambient temperature after the second preset time period and the second preset temperature difference.

In this embodiment, if the T _{outlet air attenuation} is greater than 2°C, the current rotational speed of the indoor fan will continue to increase by 100r/min, and after 20 minutes, the _{environmental change} of T and 2°C will be compared to determine whether the evaporator is full of frost. , and defrost when full of frost.

S314, if the change value of the outdoor ambient temperature is greater than the second preset temperature difference, control the air conditioner to defrost.

In this embodiment, if the T _{environment changes} > 2°C, the compressor and the indoor fan are controlled to stop running, and the outdoor fan is controlled to keep running at the current speed, so as to defrost the air conditioner.

Optionally, when the air conditioner is not frosted, the air conditioner is controlled to operate according to the current parameters. Therefore, step S1402 may further include the following steps S315-S317.

S315, if the degree of attenuation of the evaporator coil temperature is not greater than the second preset temperature difference, control the air conditioner to operate with the current parameters.

S316, if the degree of attenuation of the outlet air temperature of the indoor unit is not greater than the second preset temperature difference, control the air conditioner to operate with the current parameters, and after the second preset time period, return to perform a comparison between the degree of attenuation of the outlet air temperature of the indoor unit and the The second step of presetting the temperature difference.

S317, if the change value of the outdoor ambient temperature is not greater than the second preset temperature difference, control the air conditioner to operate with the current parameters, and after the second set period of time, return to perform comparison between the change value of the outdoor ambient temperature and the second preset temperature difference temperature difference steps.

Optionally, step S1403 may include the following steps S411-S414.

S411 , compare the attenuation degree of the evaporator coil temperature with a third preset temperature difference.

S412, if the attenuation degree of the evaporator coil temperature is greater than the third preset temperature difference, increase the current speed of the indoor fan by the third preset speed, and compare the attenuation of the outlet air temperature of the indoor unit after the third preset time period degree and the third preset temperature difference.

In this embodiment, the third preset rotational speed and the third set duration are set by technical personnel according to experience. Due to the _{initial environment} of 10°C>T, the frosting speed of the evaporator of the air conditioner increases sharply, the third preset speed can be set higher than the second preset speed, and the third preset time is shorter than the second preset time. The second preset speed can be 150r/min, and the second preset time can be 10min.

That is, when 10°C>T at the _{beginning of the environment} , if the T _{coil attenuation} >1°C, increase the current speed of the indoor fan by 150r/min, and after 10min, compare the T _{outlet air attenuation} and 1°C to judge the evaporation The frosting speed of the appliance, and whether it is necessary to adjust the speed of the indoor fan.

S413 , if the attenuation of the outlet air temperature of the indoor unit is greater than the third preset temperature difference, continue to increase the current speed of the indoor fan by the third preset speed, and compare the change value of the outdoor ambient temperature after the third preset time period and the third preset temperature difference.

In this embodiment, if the T _{outlet air attenuation} is greater than 1°C, the current rotational speed of the indoor fan will continue to increase by 150r/min, and after 10 minutes, the _{environmental change} of T and 1°C will be compared to determine whether the evaporator is full of frost. , and defrost when full of frost.

S414, if the change value of the outdoor ambient temperature is greater than the third preset temperature difference, control the air conditioner to defrost.

In this embodiment, if the T _{environment changes} > 1°C, the compressor and the indoor fan are controlled to stop running, and the outdoor fan is controlled to keep running at the current speed, so as to defrost the air conditioner.

Optionally, when the air conditioner is not frosted, the air conditioner is controlled to operate according to the current parameters. Therefore, step S1403 may further include the following steps S415-S417 in parallel with steps S411-S414.

S415 , if the degree of attenuation of the evaporator coil temperature is not greater than the third preset temperature difference, control the air conditioner to operate with the current parameters.

S416, if the degree of attenuation of the outlet air temperature of the indoor unit is not greater than the third preset temperature difference, control the air conditioner to operate with the current parameters, and after the third preset time period, return to performing comparison between the degree of attenuation of the outlet air temperature of the indoor unit and the The third step of presetting the temperature difference.

S417 , if the change value of the outdoor ambient temperature is not greater than the third preset temperature difference, control the air conditioner to operate with the current parameters, and after the third set time period, return to perform comparison between the change value of the outdoor ambient temperature and the third preset temperature difference temperature difference steps.

Further, in order to better describe the embodiments of the present invention, the embodiments of the present invention are described below through the application example shown in FIG. 3 . Assume that the first set temperature is 20°C, the second set temperature is 10°C; the first preset temperature difference is 3°C, the second preset temperature difference is 2°C, and the third preset temperature difference is 1°C; the first set The duration is 30min, the second preset duration is 20min, and the third preset duration is 10min; the first preset speed is 50r/min, the second preset speed is 100r/min, and the third preset speed is 150r/min.

As shown in FIG. 3 , the defrosting control method provided by the embodiment of the present invention may include the following processes:

S11, after the air conditioner runs for 30 minutes, detect the initial evaporator inner disk temperature T _{inner disk initial} , initial indoor unit outlet air temperature T _{outlet initial} , and initial outdoor ambient temperature T _{environment initial} .

S12, every 10 minutes, the evaporator coil temperature, the initial indoor unit outlet air temperature and the outdoor ambient temperature are detected, and the current T _{inner disk, the current T outlet air and the current} T _environment are obtained respectively.

S13, calculate the attenuation temperature of the evaporator inner disk respectively: T _{inner disk attenuation} = T _{inner disk initial -} T _{inner disk operation} , indoor unit outlet air attenuation: T _{outlet air attenuation} = T _{outlet air initial -} T _{outlet air operation} and outdoor environment change value: T _{Environment change} = T _{environment initial} - T _{environment running} .

S21, when the T _{environment is initially} greater than or equal to 20°C, determine whether _{the attenuation of the T inner disk} is greater than 3°C.

S22, if _{the attenuation of the inner disk of} T is >3°C, increase the speed of the indoor fan by 50 r/min; if _{the attenuation of the inner disk of} T is ≤3°C, control the air conditioner to continue to operate according to the current parameters, and return to step S21 after 30 minutes.

S23, after 30 minutes, determine whether the T _{outlet air attenuation} is greater than 3°C.

S24, if the T _{outlet air attenuation} is greater than 3°C, increase the speed of the indoor fan by 50 r/min; if the T _{outlet air attenuation} is ≤3°C, control the air conditioner to continue to operate according to the current parameters, and return to step S23 after 30 minutes .

S25, after 30 minutes, determine whether the _{change in the T environment} is greater than 3°C.

S26, if the T _{environment changes} >3°C, the compressor is controlled to stop running and the indoor fan is stopped; if the T _{environment change is} ≤3°C, the air conditioner is controlled to continue to run according to the current parameters, and after 30 minutes, return to step S25.

S31, when 20°C>T _{environment initial} ≥10°C, determine whether _{the attenuation of the inner disk of} T is greater than 2°C.

S32, if _{the attenuation of the inner disk of} T is >2°C, increase the speed of the indoor fan by 100 r/min; if _{the attenuation of the inner disk of} T is ≤2°C, control the air conditioner to continue to operate according to the current parameters, and return to step S31 after 20 minutes.

S33, after 20 minutes, determine whether the T _{outlet air attenuation} is greater than 2°C.

S34, if the T _{outlet air attenuation} is greater than 2°C, increase the speed of the indoor fan by 100 r/min; if the T _{outlet air attenuation} is less than or equal to 2°C, control the air conditioner to continue to operate according to the current parameters, and return to step S33 after 20 minutes .

S35, after 20 minutes, determine whether the T _{environment change} is greater than 2°C.

S36, if the T _{environment changes} > 2°C, control the compressor to stop running and the indoor fan to stop running; if the T _{environment changes} ≤ 2°C, control the air conditioner to continue to run according to the current parameters, and return to step S35 after 20 minutes.

S41, when the T _{environment is initially} less than 10°C, determine whether _{the attenuation of the inner disk of the} T is greater than 1°C.

S42, if _{the attenuation of the inner disk of} T is >1°C, increase the speed of the indoor fan by 150 r/min; if _{the attenuation of the inner disk of} T is ≤1°C, control the air conditioner to continue to operate according to the current parameters, and return to step S41 after 10 minutes.

S43, after 10 minutes, it is judged whether the T _{outlet air attenuation} is greater than 1°C.

S44, if the T _{outlet air attenuation} is greater than 1°C, increase the rotational speed of the indoor fan by 150 r/min; if the T _{outlet air attenuation} is less than or equal to 1°C, control the air conditioner to continue to operate according to the current parameters, and return to step S43 after 10 minutes .

S45, after 10 minutes, it is judged whether _{the change of the T environment} is greater than 1°C.

S46, if the T _{environment changes} > 1°C, control the compressor to stop running and the indoor fan to stop running; if the T _{environment changes} ≤ 1°C, control the air conditioner to continue to run according to the current parameters, and return to step S45 after 10 minutes.

Compared with the prior art, this embodiment has the following beneficial effects:

First of all, the defrosting control method provided in this embodiment overcomes the problem of the evaporator coil caused by the change of the outdoor ambient temperature in the prior art by adding a temperature sensing bulb for the outlet air temperature of the indoor unit and an outdoor ambient temperature sensing bulb to the air conditioner. The temperature dropped sharply, which caused the air conditioner to perform the defrost control by mistake. Since the evaporator coil temperature, indoor unit outlet air temperature and outdoor ambient temperature are comprehensively considered, the defrost control is more accurate.

Then, in the defrosting control method provided in this embodiment, by installing the sleeve on the elbow of the evaporator, and installing the temperature sensing package of the evaporator coil in the sleeve, it solves the problem of spot welding in the prior art. The installation of the inner disk temperature sensor package on the evaporator leads to the problem of inaccurate detection of the evaporator coil temperature, which makes the detected evaporator coil temperature more accurate.

Finally, considering the influence of ambient temperature on the frosting speed of the air conditioner, for different outdoor ambient temperature ranges, set the corresponding temperature difference and the rotational speed of the indoor fan to make the defrost control more accurate.

In order to implement each step of the above defrosting control method, the present embodiment also provides a defrosting control device 200 . Please refer to FIG. 4 .

The detection module 201 is used for:

When the air conditioner is turned on and runs for a set period of time, the initial evaporator coil temperature, the initial indoor unit outlet air temperature and the initial outdoor ambient temperature are detected;

According to the preset time interval, the current evaporator coil temperature, the current indoor unit outlet air temperature and the current outdoor ambient temperature are detected.

The calculation module 202 is used to calculate the difference between the initial evaporator coil temperature and the current evaporator coil temperature, the initial indoor unit outlet air temperature and the current indoor unit outlet air temperature, the initial outdoor ambient temperature and the current outdoor ambient temperature, and obtain The attenuation of the evaporator coil temperature, the attenuation of the outlet air temperature of the indoor unit, and the change of the outdoor ambient temperature.

The control module 203 is used for defrosting the air conditioner according to the initial outdoor ambient temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the outlet air temperature of the indoor unit and the change value of the outdoor ambient temperature.

Optionally, the control module 203 is further configured to:

If the initial outdoor ambient temperature is greater than or equal to the first set temperature, according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the change value of the outdoor ambient temperature and the first A relationship between a preset temperature difference, defrosting control is performed on the air conditioner;

If the initial outdoor ambient temperature is less than the first set temperature and greater than or equal to the second set temperature, according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the performing defrosting control on the air conditioner according to the relationship between the change value of the outdoor ambient temperature and the second preset temperature difference;

If the initial outdoor ambient temperature is lower than the second set temperature, then according to the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit outlet air temperature and the change value of the outdoor ambient temperature and the first Defrost control is performed on the air conditioner according to the relationship between the three preset temperature differences;

The first preset temperature difference is greater than the second preset temperature difference, and the second preset temperature difference is greater than the third preset temperature difference.

Optionally, the control module 203 is further configured to:

comparing the attenuation of the evaporator coil temperature with the first preset temperature difference;

If the degree of attenuation of the evaporator coil temperature is greater than the first preset temperature difference, increase the current speed of the indoor fan by the first preset speed, and compare the output of the indoor unit after a first set period of time. The attenuation of the wind temperature is different from the first preset temperature;

If the attenuation of the outlet air temperature of the indoor unit is greater than the first preset temperature difference, continue to increase the current speed of the indoor fan by the first preset speed, and after the first set time period, comparing the change value of the outdoor ambient temperature with the first preset temperature difference;

If the change value of the outdoor ambient temperature is greater than the first preset temperature difference, the air conditioner is controlled to defrost.

Optionally, the control module 203 is further configured to:

If the degree of attenuation of the evaporator coil temperature is not greater than the first preset temperature difference, controlling the air conditioner to operate with the current parameters;

If the attenuation of the outlet air temperature of the indoor unit is not greater than the first preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the first preset time period, it returns to perform the comparison. The steps of the attenuation of the outlet air temperature of the indoor unit and the first preset temperature difference;

If the change value of the outdoor ambient temperature is not greater than the first preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the first set period of time, it returns to perform the comparison of the outdoor The step of changing the value of the ambient temperature and the first preset temperature difference.

Optionally, the control module 203 is further configured to:

comparing the attenuation of the evaporator coil temperature with the second preset temperature difference;

If the degree of attenuation of the evaporator coil temperature is greater than the second preset temperature difference, increase the current speed of the indoor fan by a second preset speed, and compare the indoor fan after a second preset time period. The attenuation of the outlet air temperature of the machine is different from the second preset temperature;

Wherein, the second preset rotation speed is higher than the first preset rotation speed, and the second preset duration is shorter than the first preset duration;

If the attenuation of the outlet air temperature of the indoor unit is greater than the second preset temperature difference, continue to increase the current speed of the indoor fan by the second preset speed, and after the second set time period, comparing the change value of the outdoor ambient temperature with the second preset temperature difference;

If the change value of the outdoor ambient temperature is greater than the second preset temperature difference, the air conditioner is controlled to defrost.

Optionally, the control module 203 is further configured to:

If the degree of attenuation of the evaporator coil temperature is not greater than the second preset temperature difference, controlling the air conditioner to operate with the current parameters;

If the degree of attenuation of the outlet air temperature of the indoor unit is not greater than the second preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the second preset time period, it returns to perform the comparison. The step of the attenuation degree of the indoor unit outlet air temperature and the second preset temperature difference;

If the change value of the outdoor ambient temperature is not greater than the second preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the second preset time period, return to performing the comparison of the outdoor environment The step of changing the value of the ambient temperature and the second preset temperature difference.

Optionally, the control module 203 is further configured to:

comparing the attenuation of the evaporator coil temperature with the third preset temperature difference;

If the degree of attenuation of the evaporator coil temperature is greater than the third preset temperature difference, increase the current rotation speed of the indoor fan by a third preset rotation speed, and after a third preset time period, compare the indoor fan The attenuation of the outlet air temperature of the machine is different from the third preset temperature;

Wherein, the third preset rotation speed is higher than the second preset rotation speed, and the third preset duration is shorter than the second preset duration;

If the attenuation of the outlet air temperature of the indoor unit is greater than the third preset temperature difference, continue to increase the current speed of the indoor fan by the third preset speed, and after the third set time period, comparing the change value of the outdoor ambient temperature with the third preset temperature difference;

If the change value of the outdoor ambient temperature is greater than the third preset temperature difference, the air conditioner is controlled to defrost.

Optionally, the control module 203 is further configured to:

If the degree of attenuation of the evaporator coil temperature is not greater than the third preset temperature difference, controlling the air conditioner to operate with the current parameters;

If the degree of attenuation of the outlet air temperature of the indoor unit is not greater than the third preset temperature difference, the air conditioner is controlled to operate with the current parameters, and after the third preset time period, it returns to perform the comparison. The step of the attenuation degree of the indoor unit outlet air temperature and the third preset temperature difference;

If the change value of the outdoor ambient temperature is not greater than the third preset temperature difference, the air conditioner is controlled to operate at the current parameters, and after the third preset time period, return to performing the comparison of the outdoor environment The step of changing the value of the ambient temperature and the third preset temperature difference.

Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the defrost control device 200 described above. Reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

This embodiment also provides an air conditioner for implementing the above defrosting control method. Please refer to 5. FIG. 5 shows a schematic block diagram of an air conditioner 100 provided in this embodiment. The air conditioner 100 includes a memory 101 , a processor 102 , an evaporator coil temperature bulb 103 , an indoor unit outlet air temperature bulb 104 and an outdoor ambient temperature bulb 105 . The memory 101 , the evaporator coil temperature temperature sensor 103 , the indoor unit outlet air temperature sensor 104 and the outdoor ambient temperature temperature sensor 105 are all connected to the processor 102 . Illustratively, the air conditioner 100 may also include program instructions stored in ROM, RAM, or other types of non-transitory storage media, or any combination thereof. The method of the present invention can be implemented in accordance with these program instructions.

The memory 101 is used to store programs such as the defrost control device 200 . The defrosting control device 200 includes at least one software function module that can be stored in the memory 101 in the form of software or firmware. After receiving the execution instruction, the processor 102 executes the program to realize the defrosting in this embodiment. Control Method.

Wherein, the memory 101 may be, but not limited to, random access memory (Random Access Memory, RAM), read only memory (Read Only Memory, ROM), programmable read only memory (Programmable Read-Only Memory, PROM), erasable memory In addition to read-only memory (Erasable Programmable Read-Only Memory, EPROM), Electrical Erasable Programmable Read-Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM) and the like.

The processor 102 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the defrosting control method in this embodiment may be completed by an integrated logic circuit of hardware in the processor 102 or an instruction in the form of software. The above-mentioned processor 102 may be a general-purpose processor, including a central processing unit (CentralProcessing Unit, CPU), a microcontroller unit (Microcontroller Unit, MCU), a complex programmable logic device (Complex Programmable Logic Device, CPLD), field programmable gates Array (Field ProgrammableGate Array, FPGA), embedded ARM and other chips.

For convenience of explanation, only one processor is described in the air conditioner 100 . However, it should be noted that the air conditioner 100 in the present invention may also include a plurality of processors, so the steps performed by one processor described in the present invention may also be performed jointly or individually by a plurality of processors. For example, if the processor of the air conditioner 100 executes step A and step B, it should be understood that step A and step B may also be jointly executed by two different processors or executed independently in one processor. For example, the first processor performs step A and the second processor performs step B, or the first processor and the second processor perform steps A and B jointly.

This embodiment also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by the processor 102, the defrosting control method disclosed in the foregoing embodiment is implemented.

To sum up, the embodiments of the present invention provide a defrosting control method, device, and air conditioner. The method includes: first, when the air conditioner is turned on for a set period of time, detecting the initial evaporator coil temperature, the initial indoor unit output Wind temperature and initial outdoor ambient temperature, and detect the current evaporator coil temperature, current indoor unit temperature and current outdoor ambient temperature at preset time intervals. Then, calculate the attenuation degree of evaporator coil temperature, the attenuation degree of indoor unit outlet air temperature and the change value of outdoor ambient temperature respectively, and calculate the attenuation degree of evaporator coil temperature, indoor unit outlet air temperature attenuation degree and outdoor temperature according to the The change value of the ambient temperature is used to control the defrost of the air conditioner. Because the judgment temperature of the evaporator, the outlet air temperature of the indoor unit and the outdoor ambient temperature are combined, the defrost control is more accurate.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed by the present invention can easily think of changes or substitutions. All should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A defrosting control method characterized by comprising:

when the air conditioner is started and runs for a set length, detecting the initial evaporator coil temperature, the initial indoor unit air outlet temperature and the initial outdoor environment temperature;

detecting the current temperature of an evaporator coil, the current air outlet temperature of an indoor unit and the current outdoor environment temperature according to a preset time interval;

respectively calculating the difference values of the initial evaporator coil temperature and the current evaporator coil temperature, the initial indoor unit air outlet temperature and the current indoor unit air outlet temperature, and the initial outdoor environment temperature and the current outdoor environment temperature to obtain the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit air outlet temperature and the change value of the outdoor environment temperature;

and defrosting the air conditioner according to the initial outdoor environment temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the air outlet temperature of the indoor unit and the variation value of the outdoor environment temperature.

2. The defrosting control method according to claim 1, wherein the step of performing defrosting control on the air conditioner according to the initial outdoor environment temperature, the degree of attenuation of the evaporator coil temperature, the degree of attenuation of the indoor unit outlet air temperature, and the variation value of the outdoor environment temperature includes:

if the initial outdoor environment temperature is greater than or equal to a first set temperature, defrosting the air conditioner according to the relation among the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the air outlet temperature of the indoor unit, the variation value of the outdoor environment temperature and a first preset temperature difference;

if the initial outdoor environment temperature is less than the first set temperature and greater than or equal to a second set temperature, defrosting the air conditioner according to the relationship among the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the air outlet temperature of the indoor unit, the variation value of the outdoor environment temperature and a second preset temperature difference;

if the initial outdoor environment temperature is lower than the second set temperature, defrosting the air conditioner according to the relation among the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the air outlet temperature of the indoor unit, the variation value of the outdoor environment temperature and a third preset temperature difference;

the first preset temperature difference is larger than the second preset temperature difference, and the second preset temperature difference is larger than the third preset temperature difference.

3. The defrosting control method according to claim 2, wherein the step of performing defrosting control on the air conditioner according to the relationship between the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the outlet air temperature of the indoor unit, the variation value of the outdoor environment temperature, and the first preset temperature difference comprises:

comparing the attenuation degree of the temperature of the evaporator coil with the first preset temperature difference;

if the attenuation degree of the temperature of the evaporator coil is greater than the first preset temperature difference, increasing the current rotating speed of an indoor fan by a first preset rotating speed, and comparing the attenuation degree of the air outlet temperature of the indoor unit with the first preset temperature difference after a first set time length;

if the attenuation degree of the outlet air temperature of the indoor unit is greater than the first preset temperature difference, continuously increasing the current rotating speed of the indoor fan to the first preset rotating speed, and comparing the change value of the outdoor environment temperature with the first preset temperature difference after the first set time length;

and if the change value of the outdoor environment temperature is greater than the first preset temperature difference, controlling the air conditioner to defrost.

4. The defrosting control method according to claim 3, wherein the step of performing defrosting control on the air conditioner according to the relationship between the attenuation degree of the temperature of the evaporator coil, the attenuation degree of the outlet air temperature of the indoor unit, the variation value of the outdoor environment temperature, and the first preset temperature difference further comprises:

if the attenuation degree of the temperature of the evaporator coil is not larger than the first preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the first set time length, returning to execute the step of comparing the attenuation degree of the temperature of the evaporator coil with the first preset temperature difference;

if the attenuation degree of the air outlet temperature of the indoor unit is not greater than the first preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the first set time length, returning to the step of comparing the attenuation degree of the air outlet temperature of the indoor unit with the first preset temperature difference;

and if the change value of the outdoor environment temperature is not greater than the first preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the first set time length, returning to execute the step of comparing the change value of the outdoor environment temperature with the first preset temperature difference.

5. The defrosting control method according to claim 3, wherein the step of performing defrosting control on the air conditioner according to the relationship between the degree of attenuation of the temperature of the evaporator coil, the degree of attenuation of the outlet air temperature of the indoor unit, the variation value of the outdoor environment temperature, and a second preset temperature difference comprises:

comparing the attenuation degree of the temperature of the evaporator coil with the second preset temperature difference;

if the attenuation degree of the temperature of the evaporator coil is greater than the second preset temperature difference, increasing the current rotating speed of the indoor fan by a second preset rotating speed, and comparing the attenuation degree of the air outlet temperature of the indoor unit with the second preset temperature difference after a second set time length;

wherein the second preset rotation speed is higher than the first preset rotation speed, and the second set time length is shorter than the first set time length;

if the attenuation degree of the air outlet temperature of the indoor unit is greater than the second preset temperature difference, continuously increasing the current rotating speed of the indoor fan by the second preset rotating speed, and comparing the change value of the outdoor environment temperature with the second preset temperature difference after the second set time length;

and if the change value of the outdoor environment temperature is greater than the second preset temperature difference, controlling the air conditioner to defrost.

6. The defrosting control method according to claim 5, wherein the step of performing defrosting control on the air conditioner according to a relationship between the degree of attenuation of the temperature of the evaporator coil, the degree of attenuation of the outlet air temperature of the indoor unit, and the variation value of the outdoor environment temperature, and a second preset temperature difference further comprises:

if the attenuation degree of the temperature of the evaporator coil is not larger than the second preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the second set time length, returning to execute the step of comparing the attenuation degree of the temperature of the evaporator coil with the second preset temperature difference;

if the attenuation degree of the air outlet temperature of the indoor unit is not greater than the second preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the second set time length, returning to the step of comparing the attenuation degree of the air outlet temperature of the indoor unit with the second preset temperature difference;

and if the change value of the outdoor environment temperature is not greater than the second preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the second set time length, returning to execute the step of comparing the change value of the outdoor environment temperature with the second preset temperature difference.

7. The defrosting control method according to claim 5, wherein the step of performing defrosting control on the air conditioner according to the relationship between the degree of attenuation of the temperature of the evaporator coil, the degree of attenuation of the outlet air temperature of the indoor unit, the variation value of the outdoor environment temperature, and a third preset temperature difference comprises:

comparing the attenuation of the temperature of the evaporator coil with the third preset temperature difference;

if the attenuation degree of the temperature of the evaporator coil is greater than the third preset temperature difference, increasing the current rotating speed of the indoor fan by a third preset rotating speed, and comparing the attenuation degree of the air outlet temperature of the indoor unit with the third preset temperature difference after a third set time length;

wherein the third preset rotation speed is higher than the second preset rotation speed, and the third set time period is shorter than the second set time period;

if the attenuation degree of the air outlet temperature of the indoor unit is greater than the third preset temperature difference, continuously increasing the current rotating speed of the indoor fan by the third preset rotating speed, and comparing the change value of the outdoor environment temperature with the third preset temperature difference after the third set time length;

and if the change value of the outdoor environment temperature is greater than the third preset temperature difference, controlling the air conditioner to defrost.

8. The defrosting control method according to claim 7, wherein the step of performing defrosting control on the air conditioner according to a relationship between the degree of attenuation of the temperature of the evaporator coil, the degree of attenuation of the outlet air temperature of the indoor unit, and the variation value of the outdoor environment temperature, and a third preset temperature difference further comprises:

if the attenuation degree of the temperature of the evaporator coil is not larger than the third preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the third set time length, returning to execute the step of comparing the attenuation degree of the temperature of the evaporator coil with the third preset temperature difference;

if the attenuation degree of the air outlet temperature of the indoor unit is not greater than the third preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the third set time length, returning to the step of comparing the attenuation degree of the air outlet temperature of the indoor unit with the third preset temperature difference;

and if the change value of the outdoor environment temperature is not greater than the third preset temperature difference, controlling the air conditioner to operate according to the current parameters, and after the third set time length, returning to execute the step of comparing the change value of the outdoor environment temperature with the third preset temperature difference.

9. A defrosting control apparatus characterized by comprising:

a detection module to:

when the air conditioner is started and runs for a set length, detecting the initial evaporator coil temperature, the initial indoor unit air outlet temperature and the initial outdoor environment temperature;

detecting the current temperature of an evaporator coil, the current air outlet temperature of an indoor unit and the current outdoor environment temperature according to a preset time interval;

the calculation module is used for calculating the difference values of the initial evaporator coil temperature and the current evaporator coil temperature, the initial indoor unit air outlet temperature and the current indoor unit air outlet temperature, and the initial outdoor environment temperature and the current outdoor environment temperature respectively to obtain the attenuation degree of the evaporator coil temperature, the attenuation degree of the indoor unit air outlet temperature and the change value of the outdoor environment temperature;

and the control module is used for carrying out defrosting control on the air conditioner according to the initial outdoor environment temperature, the attenuation degree of the evaporator coil temperature, the attenuation degree of the air outlet temperature of the indoor unit and the variation value of the outdoor environment temperature.

10. An air conditioner, characterized in that the air conditioner comprises:

one or more processors;

memory to store one or more programs that, when executed by the one or more processors, cause the one or more processors to implement the defrosting control method of any of claims 1-8.

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