Indoor unit anti-freezing control method for air conditioner

Abstract

The invention belongs to the technical field of air conditioners, particularly relates to an indoor unit anti-freezing control method for an air conditioner, and aims at solving the problems that according to an existing air conditioner, accurate judgment on the freezing situation of an indoor unit is difficult according to the inner coil pipe temperature, and the accidental errors are likely to exist due to an existing point taking judgment method. The indoor unit anti-freezing control method comprises the steps that when the air conditioner is under the circumstance of a refrigeration work condition, the average current value Id of an indoor draught fan is obtained at the interval of t1, and the first attenuation degree of the Id is calculated; if the first attenuation degree is smallerthan the first preset value, the average current value Im of the indoor draught fan is obtained at the interval of t2, and the second attenuation degree of the Im is calculated; according to the second attenuation degree, whether the air conditioner enters an anti-freezing mode or not is judged; and accordingly, the problem that the mistaken judgment is caused by the current fluctuation phenomenonof the indoor draught fan of the air conditioner, the air conditioner frequently enters the indoor unit anti-freezing mode due to the mistaken judgment, and the air conditioner refrigeration effect is influenced is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to an anti-freezing control method for an indoor unit of an air conditioner. Background technique [0002] With the continuous improvement of people's living standards, people have also put forward higher and higher requirements for the living environment. In order to maintain a comfortable ambient temperature, air conditioners have become an essential device in people's lives. Generally, an air conditioner includes an indoor unit, an outdoor unit, and a circulation loop for connecting the indoor unit and the outdoor unit. The heat exchange medium in the air conditioner continuously exchanges heat between the outdoor unit and the indoor unit through the circulation loop, thereby achieving a change in room temperature. Effect. Taking the cooling operation of the air conditioner as an example, the coil of the indoor unit is always at a low temperature; at this t...

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that it is difficult to accurately judge the freezing situation of the indoor unit through the temperature of the inner coil of the existing air conditioner, and the existing method of point selection is prone to accidental errors, The invention provides an indoor unit anti-freezing control method for an air conditioner. The indoor unit anti-freezing control method includes the following steps: when the air conditioner is in the cooling condition, every t 1 Time to obtain the average current I of the indoor fan d , and calculate I d The first degree of attenuation; if the first degree of attenuation is less than the first preset value, every t 2 Time to obtain the average current I of the indoor fan m , and calculate I m The second degree of attenuation; according to the second degree of attenuation, it is judged whether to make the air conditioner enter the anti-freezing mode; where, t 2 = nt 1 , n is an integer ≥ 2; I m =(I 1 +I 2 +…I n ) / n, I 1 , I 2 ,..., I n for a t 2 During the time period, every t 1 Time-respectively acquired average current of the indoor fan

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