Method and system for improving control accuracy of compressor target frequency after defrosting of air conditioner

Abstract

The invention relates to a method and system for improving target frequency control precision of a compressor after defrosting of an air conditioner. The method includes the steps that an outdoor environment temperature T0 of the air conditioner before defrosting is detected; an outdoor environment temperature T1 of the air conditioner after defrosting is conducted and before the air conditioner starts heating again is detected; the outdoor environment temperature difference delta T is calculated as T1-T0; the delta T is compared with a preset value A, a target frequency of the compressor is determined according to a comparison result; if delta T is larger than or equal to A, the target frequency of the compressor is the frequency corresponding to T1; if delta T is smaller than A, the target frequency of the compressor is the frequency corresponding to T0. By means of the method and system, influences of heating of an outdoor heat exchanger on an outdoor environment temperature detection unit during defrosting can be effectively prevented, so that the target frequency of the compressor is more accurate when the air conditioner starts heating again, and the temperature raising effect of the air conditioner can be effectively improved after defrosting is carried out and after the air conditioner starts heating again.

Description

technical field [0001] The invention belongs to the field of air conditioning technology, and in particular relates to a method and a system for improving the control accuracy of the target frequency of a compressor after defrosting of an air conditioner. Background technique [0002] At present, the operating frequency of the inverter air conditioner compressor is determined according to the outdoor ambient temperature, and the outdoor ambient temperature is detected by a temperature sensor fixed on the upper part of the outdoor heat exchanger fin. [0003] When the air conditioner is running at low temperature for heating, frost may form on the outdoor heat exchanger. In order to ensure the heating effect, it is necessary to defrost the outdoor unit. The defrosting method of existing air conditioners is generally: switch from heating operation to cooling operation, that is, to change the direction of the four-way valve, and the outdoor heat exchanger is changed from an eva...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the control accuracy of the compressor target frequency after defrosting of the air conditioner, which solves the problem that the temperature detected by the temperature sensor will be higher than the actual ambient temperature before re-entering the heating operation after defrosting of the existing air conditioner , resulting in a low target frequency for the compressor to re-enter the heating operation, which makes the temperature rise effect worse after startup

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