Method for controlling frequency of compressor of inverter air conditioner

Abstract

The invention discloses a method for controlling the frequency of a compressor of an inverter air conditioner, which comprises the following steps of: determining a plurality of continuous temperature difference intervals and a corresponding target frequency according to a set temperature and an environmental temperature; after the compressor is initially started, operating the compressor for m minutes towards the target frequency; and calculating the temperature difference and the temperature difference change rate Dt at intervals of n seconds and correcting the real-time operating frequency of the compressor according to the temperature difference and the temperature difference change rate. The method for controlling the frequency of the compressor of the inverter air conditioner, which is disclosed by the invention, can be used for accurately controlling the frequency of the compressor according to the actual output and the room load, so that the room temperature stably reaches the target temperature.

Description

technical field [0001] The present invention relates to the technical field of frequency conversion air conditioners, and more specifically relates to a frequency control method for frequency conversion air conditioner compressors. Background technique [0002] Inverter air conditioners can provide people with a comfortable indoor space environment because of the variable speed of the compressor and the flow rate of the circulating refrigerant in the system as the environment changes. Moreover, the inverter air conditioners are relatively energy-saving. Therefore, the inverter air conditioners are becoming more and more popular. Recognized and respected by many people. [0003] Inverter air conditioners control the indoor temperature through the operating frequency (rotational speed) of the compressor to achieve energy saving and comfort effects. The frequency control of the compressor is one of the core technologies of the inverter air conditioner. Reliability, comfort and...

AI Technical Summary

Problems solved by technology

This method is mainly to divide the entire compressor operating frequency range into multiple frequency gears, with a difference of a few hertz or more than ten hertz between each gear, a certain temperature difference corresponds to the corresponding frequency gear, and when the temperature difference changes, the frequency will rise or fall. One gear or multiple gears, this adjustment method is reflected in the air conditioner, that is, the operating frequency of the compressor can only be at a few fixed frequency points, and the frequency fluctuation is relatively large when changing. , the system output capacity cannot reflect the actual room load

The biggest disadvantage of this method is that the operating frequency of the compressor fluctuates greatly, and the constant temperature of the indoor temperature is affected.

[0005] 2. Frequency fuzzy control method: The simple fuzzy control method can solve the problem of relatively large frequency fluctuations in the step-by-step control method, but there are also defects. First, fuzzy control relies on the control unit to detect the temperature to feed back the system situation, but the temperature There is a hysteresis to reflect the system situation, so the response is slow, which will cause a large overshoot, and the frequency will vibrate every time it is adjusted

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