Defrosting control method and system for air conditioner and air conditioner

Abstract

The invention relates to a defrosting control method and system for an air conditioner and the air conditioner. The defrosting control method for the air conditioner comprises the following steps that S1, the lowest air outlet temperature Tmin of an air outlet of an indoor unit is detected; S2, the continuous operating time t of the air conditioner in a heating mode is acquired; S3, whether t is equal to or larger than a first target time t1 or not is judged, the step S4 is executed if yes, and the step S2 is executed again if not; S4, the air outlet temperature T of the air outlet of the indoor unit is detected; and S5, whether the difference value delta T between T and Tmin is equal to or larger than a target temperature difference value Ta or not is judged, delta T=Tmin-T, the air conditioner is switched to be in a defrosting mode if yes, and the step S4 is executed again a second target time t2 later if not. According to the defrosting control method and system for the air conditioner and the air conditioner, whether the air conditioner is switched to be in the defrosting mode or not is judged by detecting the change of the air outlet temperature of the air outlet of the indoor unit, the thickness of a frost layer can be reflected intelligently and accurately, and the situations that due to the fact that the air conditioner is switched to be in the frosting mode frequently, the heating effect of the air conditioner is affected, fluctuation of the indoor temperature is caused, and the use comfort is affected are avoided.

Description

technical field [0001] The invention relates to the field of air conditioner control, in particular to an air conditioner defrosting control method, a control system and an air conditioner. Background technique [0002] When the air conditioner is heating at low temperature, frost will form on the coil of the condenser, which will affect the heating effect of the air conditioner. At this time, it is necessary to enter the defrosting mode. At present, the defrosting control of the air conditioner is mostly by detecting the temperature change somewhere in the condenser, such as the temperature in the middle of the condenser and the outlet temperature of the condenser, so as to determine whether the condenser system is frosted, and then enter the defrosting mode. This control method The disadvantage is that at low temperature and low humidity, the detected ambient temperature value and the temperature of the condenser coil are very low, but the frost layer is very thin or even ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an air conditioner defrosting control method, a control system and an air conditioner, so as to solve the problem that the above air conditioner defrosting control method frequently enters defrosting, which affects the heating effect of the air conditioner, causes fluctuations in indoor temperature, and affects the use of air conditioners. technical issues of comfort

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