Defrosting control method and system and heat pump type air conditioner

Abstract

The invention provides a defrosting control method and system and a heat pump type air conditioner. The defrosting control method for the heat pump type air conditioner comprises the steps that after a heating operation mode of the heat pump type air conditioner is detected, the operation current of an outdoor fan is detected in real time, and the operation time T1 of a compressor is recorded; whether the operation current is larger than a preset operation current or not is judged, timekeeping is started when the operation current is larger than the preset operation current, and the accumulated operation time T2 of the operation current is recorded; whether T2 is larger than a first preset time value or not is judged, and whether T1 is larger than a second preset time value or not is judged when T2 is larger than or equal to the first preset time value; and defrosting is conducted when T1 is larger than the second preset time value. According to the defrosting control method provided by the invention, the effect that defrosting is conducted through the influences of frosting of the air conditioner on loads of the outdoor fan is achieved, whether the air conditioner needs defrosting or not can be judged correctly, the defrosting speed and defrosting efficiency are effectively improved, and the heating efficiency of the air conditioner is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning control, in particular to a defrosting control method, a defrosting control system and a heat pump air conditioner. Background technique [0002] When the air conditioner is running for heating in cold winter, if the outdoor temperature is low and the humidity is high, it is very easy to cause frost on the outdoor unit of the air conditioner. If the outdoor unit cannot be defrosted in time and quickly, the performance of the air conditioner will be seriously affected. Heating performance. [0003] At present, air conditioners generally use reverse cycle defrosting technology, and the signals usually used to judge whether to defrost are: on the one hand, the time signal, the cumulative running time of the compressor meets certain conditions, and meets certain temperature conditions; on the other hand, Temperature signal, when the temperature signal of a certain temperature sensor satisfie...

AI Technical Summary

Problems solved by technology

[0002] When the air conditioner is running for heating in cold winter, if the outdoor temperature is low and the humidity is high, it is very easy to cause frost on the outdoor unit of the air conditioner. If the outdoor unit cannot be defrosted in time and quickly, the performance of the air conditioner will be seriously affected. Heating performance

[0003] At present, air conditioners generally use reverse cycle defrosting technology, and the signals usually used to judge whether to defrost are: on the one hand, the time signal, the cumulative running time of the compressor meets certain conditions, and meets certain temperature conditions; on the other hand, Temperature signal, when the temperature signal of a certain temperature sensor satisfies certain conditions, or accumulates for a certain period of time, and the temperature signal meets certain conditions, it is determined that the air conditioner can be defrosted. However, such defrosting technology is subject to interference from factors such as ambient temperature changes problems, which lead to the inability to correctly identify whether to defrost, and may cause false defrosting or the problem of not defrosting if the frost is too thick

[0004] On the other hand, it is judged whether to defrost according to the cumulative running time of the compressor and the difference in the speed change of the outdoor fan. However, the current air conditioner increases its operating power and current by increasing the duty cycle of the fan, so that the outdoor When the speed of the fan reaches the set speed, the control method of keeping the speed of the fan constant is often adopted. This scheme can be used when the outdoor motor is an AC motor whose speed cannot be adjusted, but it is not suitable for the current outdoor motor that is a DC motor. Inverter heat pump air conditioner

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