Variable-frequency air-conditioner control method and control device thereof

Abstract

The invention discloses a variable-frequency air-conditioner control method. The method includes: acquiring room temperature and humidity; according to room temperature and humidity, calculating the difference between room temperature and set temperature and the measured values of temperature difference change rate and air-conditioning output capacity change rate as the input parameters of fuzzy control; respectively quantifying the temperature difference and the measured values of temperature difference change rate and air-conditioning output capacity change rate so as to acquire the converting values of the temperature difference, the temperature difference change rate and the air-conditioning output capacity change rate in the corresponding universe of discourse; according to the converting values of the temperature difference, the temperature difference change rate and the air-conditioning output capacity change rate, calculating and outputting compressor frequency by preset fuzzy control regulations. The invention with the characteristics of accurate control, quick response and small overshooting can satisfy the requirements of high control accuracy, excellent transition process and high comfort, which is conducive to reducing the tear and wear of the compressor and saving the energy. Correspondingly, the invention also discloses a variable-frequency air-conditioner control device thereof.

Description

technical field [0001] The invention relates to the field of control systems of air conditioning devices, in particular to a control method and a control device for frequency conversion air conditioners. Background technique [0002] Inverter air conditioners control the indoor temperature and achieve the purpose of energy saving by changing the frequency of the compressor. Generally, the following two control methods are used: [0003] One is the traditional control method. The frequency conversion air conditioner adjusts the frequency of the compressor according to the difference between the set temperature and the indoor temperature, that is, the frequency range of the compressor is divided into several sections on average. The temperature difference value corresponds to a specific frequency. This control method will cause the air conditioning output capacity of the air conditioner to be inconsistent with the real indoor load, causing the compressor to reciprocate and ru...

AI Technical Summary

Problems solved by technology

This control method will cause the air conditioner's air conditioning output capacity to be inconsistent with the real indoor load, causing the compressor to reciprocate and run at different frequencies, and the room temperature to reciprocate and oscillate around the set temperature

[0004] The second is the fuzzy control method, which can solve the above problems, but there are still some defects: on the one hand, because the environmental parameters have a certain lag with respect to the output of the air conditioner, the indoor and outdoor environmental parameters and their changing trends are used as feedback parameters for frequency modulation control. The measurement data lags behind, and the performance parameters of the air conditioner itself, that is, the output capacity of the air conditioner, are not used as feedback parameters, resulting in slow response and large overshoot; The adaptability is relatively weak, and the indoor temperature model is easily affected by the external environment, which leads to the fact that the indoor comfort and the energy-saving performance of the air conditioner cannot fully meet the requirements

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