Method for controlling minimum frequency of variable frequency air conditioner

Abstract

The invention discloses a method for controlling the minimum running frequency of a variable frequency air conditioner. The method is characterized by comprising the following steps: (1) the outdoor environment temperature or the compressor exhaust pressure is detected periodically; (2) according to the outdoor environment temperature-minimum frequency function or the compressor exhaust pressure-frequency function, the minimum running frequency of a compressor under the outdoor environment temperature or the compressor exhaust pressure at present is calculated; and (3) the minimum running frequency of the compressor is updated according to calculation results in the step (2). According to the method for controlling the minimum running frequency of the variable frequency air conditioner, the outdoor environment temperature or the compressor exhaust pressure is detected periodically, the minimum running frequency capable of being borne by the compressor at present is calculated, the minimum running frequency of the compressor is updated, and it is guaranteed that when the air conditioner runs at a low frequency, the problems that losses of the compressor will be caused when loads are too large, and the service life is shortened are solved.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a method for controlling the minimum frequency of an inverter air conditioner. Background technique [0002] The frequency conversion air conditioner can use the frequency of the frequency conversion power supply to make the compressor work within a certain frequency range according to the temperature control command, so as to adjust the refrigerant flow rate to adjust the indoor temperature range. In the current operating frequency control method of the inverter air conditioner compressor, the minimum frequency at which the air conditioner can operate is often set as a fixed value, that is to say, the minimum capacity output is performed at the same frequency point regardless of whether the air conditioner is under heavy load or light load. [0003] In fact, due to the difference in the suction and exhaust pressure of the inverter air conditioner compressor,...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the minimum operating frequency of the existing variable frequency air conditioner is set as a fixed value, which cannot adapt to the output under different load conditions, which will increase the loss of the compressor and shorten the service life, the present invention proposes a minimum operating frequency of the variable frequency air conditioner Control method that can solve the above problems

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