Frequency control method and control device of compressor of air conditioner

Abstract

The invention discloses a frequency control method and control device of a compressor of an air conditioner. The method comprises the following steps: when the temperature difference between the actual temperature of the room in which the air conditioner is positioned and the set temperature of the air conditioner is greater than the preset value, firstly controlling the compressor to work at a first frequency until the temperature difference is equal to the preset temperature value; then controlling the compressor to work at a second frequency until the temperature difference is equal to 0 DEG C; when the temperature difference is equal to 0 DEG C and the room load is not changed, controlling the frequency of the compressor according to the intervention algorithm; when the temperature difference is equal to 0 DEG C and the room load is changed, modifying the working frequency of the compressor according to the intervention algorithm and the incremental PID algorithm; and when the temperature difference is not greater than the preset value, directly controlling the frequency of the compressor according to the incremental PID algorithm. In the invention, different control algorithms are used for adjusting the frequency of the compressor according to different temperature difference, thereby effectively reducing overshoot control, furthest eliminating control static error and realizing the purpose of simply, quickly and stably adjusting temperature.

Description

technical field [0001] The invention relates to the control of an air conditioner compressor, in particular to a method and device for frequency control of the air conditioner compressor, and belongs to the technical field of air conditioner control. Background technique [0002] Inverter air conditioner is a new type of air conditioner developed in recent years. It uses variable frequency inverter compressor and corresponding control technology, which can automatically adjust the operating frequency of the compressor according to the change of room temperature, and then change the speed of the compressor. Realize the adjustment of the temperature of the air conditioner. Inverter air conditioners have the characteristics of fast temperature adjustment, low noise, low energy consumption and long service life, and are the future development direction of the air conditioner market. [0003] Existing frequency conversion air conditioners generally use a simple look-up table fuz...

AI Technical Summary

Problems solved by technology

Since the control rules in the PI control method are also fixed, the adaptive ability of the control process is weak, and because the PI control does not consider the temperature difference change rate, the adjustment speed of the compressor frequency is slow under this method, and there are often fluctuations in the adjustment process , there will also be control static difference due to different room loads

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