Frequency boundary control method for variable-frequency air conditioner compressor

Abstract

The invention discloses a frequency boundary control method for a variable-frequency air conditioner compressor. The method comprises the following steps of (1) detecting a maximum working frequency F1 of the compressor by taking upper limit value deltaT of temperature rise of a controller as constraint condition; (2) detecting a maximum working frequency F2 of the compressor by taking upper limit value deltaP of allowable working pressure of the compressor as constraint condition; (3) comparing F1 with F2 to obtain a smaller value F3; (4) simplifying and fitting F3 according to linear function relationship to obtain a function relationship curve F4 of the maximum working frequency of the compressor and the outdoor ambient temperature in the outdoor ambient temperature interval T; and (5) determining a function relationship curve Fmax of the maximum working frequency of the compressor and the outdoor ambient temperature as well as the input voltage value. According to the frequency boundary control method for the variable-frequency air conditioner compressor, the working frequency of the compressor is reset through the introduction of the outdoor ambient temperature and the input variable of the input voltage of the air-conditioner, the boundary is widened, and the reliability of the compressor and the electronic control is fully ensured.

Description

technical field [0001] The invention relates to a frequency boundary control method for a compressor of an inverter air conditioner, and belongs to the technical field of inverter air conditioners. Background technique [0002] The operating frequency boundary of the traditional inverter air conditioner compressor is a fixed value, see figure 1 As shown, it is the maximum operating frequency diagram of the existing inverter air conditioner compressor, which is the theoretical maximum frequency and has no functional correlation with parameters such as outdoor ambient temperature and input voltage. It is only a single boundary frequency value. The actual operation depends on the exhaust temperature, current And other parameter adjustments, the frequency is very low under certain working conditions, and even if the control parameters are conservative under ultra-low voltage, it cannot avoid the possibility that the operating pressure of the compressor exceeds the standard and t...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that the operating frequency boundary of the existing variable frequency air conditioner compressor is a fixed value, which may easily cause the operating pressure of the compressor to exceed the standard, and the frequency boundary of the compressor is set too low, the maximum frequency is limited, and the maximum refrigeration capacity cannot be exerted. For the problem of unfavorable heat dissipation of electronic control components, a frequency boundary control method for inverter air conditioner compressors is provided. On the premise of satisfying the reliability of compressor operation and electronic control operation reliability, the compressor operation frequency boundary is set to Wide, under the new frequency boundary, the reliability of the compressor and electric control can be fully guaranteed

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