Defrost control method of air conditioner

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a defrost control method of an air conditioner. In order to more accurately judge the time for entering adefrost mode, the defrost control method provided by the invention comprises the steps of when the air conditioner is at a heating mode, detecting a real-time current value of an outdoor fan and a temperature of an outdoor coil; comparing real-time current value of the outdoor fan and a selected first standard current value, a selected second standard current value and a selected third standard current value; and based on the temperature of the outdoor coil, judging whether the air conditioner enters the defrost mode or not according to the comparison result. According to the defrost control method of the air conditioner provided by the invention, by utilizing double judgement standards of the temperature of the outdoor coil and the current of the outdoor fan, the defrost time can be accurately selected, the limitation of the prior art that a frosting degree is judged according to the temperature of the outdoor coil is effectively eliminated, the defrost times of the air conditioner isreduced, and the user experience is improved.

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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