Method and device for controlling inverter compressor

Abstract

The invention discloses a method for controlling an inverter compressor. According to the method, a target temperature and a dividing temperature point are preset, and a sensor monitors an actual temperature value. The method comprises the following steps that: a controller judges whether the difference between an actual temperature and the target temperature is zero, and the compressor operates at a minimum frequency for a certain period if the difference between an actual temperature and the target temperature is zero; the controller judges whether the target temperature is reached, and thecompressor stops operation if the target temperature is reached, or the controller initializes a PID parameter to allow an inverter to make the compressor start to raise frequency quickly if the target temperature is not reached; the controller judges whether the preset dividing temperature point is reached, and the PID parameter is adjusted if the preset dividing temperature point is reached, orthe PID parameter is kept constant if the reset dividing temperature point is not reached; and the controller judges whether the target temperature is reached, and the compressor operates at a constant frequency and the frequency inversion is finished if the target temperature is reached, or the compressor raises frequency while keeping the original PID parameter if the target temperature is not reached. Correspondingly, the invention also provides a device for controlling the inverter compressor. The method and the device can realize a quick, energy-saving and stable frequency inversion process at the same time.

Description

technical field [0001] The invention relates to the technical field of heating and ventilation, in particular to a control method and device for a variable frequency compressor. Background technique [0002] At present, frequency conversion technology is being used more and more in air conditioning, refrigeration, HVAC and other systems. The frequency conversion compressor can adjust the operating frequency of the compressor rotor according to the actual cooling / heating load, thereby controlling the refrigerant circulation of the compressor and Refrigerant flow into the heat exchanger. The higher the operating frequency, the greater the flow of refrigerant, the greater the cooling / heating capacity, and the stronger the cooling / heating capacity. However, the traditional fixed-frequency compressor always operates at a certain frequency. When the corresponding cooling / heating capacity is not actually needed , resulting in a waste of energy, so the advantages of high-efficiency...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, no matter what frequency conversion method is used, since the fixed PID parameters are used in the frequency up process, it is only limited to a basically constant frequency conversion speed, and cannot be adjusted according to the actual situation in the process of reaching the target temperature. Frequency conversion speed, so fast, energy-saving and stable frequency conversion process cannot be achieved at the same time

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