Defrosting control method of air conditioner

Abstract

The invention belongs to the technical field of air conditioners, in particular to a defrosting control method of an air conditioner. In order to more accurately judge defrosting timing, the defrosting control method of the air conditioner, provided by the invention comprises the following steps: detecting a real-time current value of an outdoor fan under the circumstance that the air conditioneris in a heating condition; calculating the attenuation degree of the real-time current value of the outdoor fan; and judging whether the air conditioner is enabled to enter a defrosting mode or not according to the attenuation degree. As the current magnitude of the outdoor fan can be correspondingly changed along with the frosting degree of an outdoor coil, and the attenuation degree of the real-time current value of the outdoor fan is capable of accurately reflecting the change condition of the current of the outdoor fan, frost quantity of the outdoor coil can be more accurately reflected according to the attenuation degree of the real-time current value of the outdoor fan, and therefore, the defrosting timing is selected more accurately, limitations during judging the frosting degree byadopting the temperature of the outdoor coil in the prior art can be effectively eliminated, the defrosting time of the air conditioner is reduced, and the user experience is promoted.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner defrosting control method. Background technique [0002] As a device that can adjust the indoor ambient temperature, the air conditioner works on the principle that the indoor ambient temperature is reduced or increased by the refrigerant passing through the circulation pipeline through high-pressure / low-pressure / gas / liquid state transitions, that is, from From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is in heating operation, if the temperature of the outdoor coil is too low under certain humidity conditions, it will cause frosting, and the frosting of the outdoor coil will reduce the heat exchange efficiency of the outdoor heat exchanger and affect the cooling performance of the air conditioner. The thermal effect reduces the comfort of the indoor environment and affec...

AI Technical Summary

Problems solved by technology

However, this method of judging frosting requires high accuracy of the outdoor coil sensor, and it is more accurate when the outdoor heat exchanger has a good shunt flow. Once the outdoor heat exchanger does not have a good shunt flow, the outdoor coil sensor will It is impossible to accurately determine the evaporation temperature of each branch flow (the outdoor coil sensor can only determine the evaporation temperature of one branch flow)

In this case, the following situation is likely to occur: the outdoor coil has actually frosted, but the temperature of the outdoor coil is high, so the defrosting cannot be accurately controlled, resulting in frost failure or defrosting unclean situation

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