Patent ID: 9683563
Date: 2017-06-20
CPC Classifications: F01B,F01C,F04B,F04C,G01H,G01M,G05B,G05D,G06F,G16Z

Claim:
1. A system comprising: a variable speed compressor operable at a plurality of frequencies; and a control module that controls an operating frequency of the variable speed compressor, the control module storing at least one prohibited frequency range that includes a resonant frequency of the variable speed compressor and storing an allowed upper frequency and an allowed lower frequency for each prohibited frequency range of the at least one prohibited frequency range, the allowed upper frequency being above the associated prohibited frequency range and the allowed lower frequency being below the associated prohibited frequency range; wherein the control module determines a requested frequency for operating the variable speed compressor, compares the requested frequency with the at least one prohibited frequency range, operates the variable speed compressor at the requested frequency when the requested frequency is outside of the at least one prohibited frequency range, determines an upper frequency operating time and a lower frequency operating time when the requested frequency is within the at least one prohibited frequency range, and operates the variable speed compressor at the allowed upper frequency for the upper frequency operating time and at the allowed lower frequency for the lower frequency operating time when the requested frequency is within the at least one prohibited frequency range, and wherein the control module determines the upper frequency operating time and the lower frequency operating time such that a time-averaged frequency output over the upper frequency operating time and the lower frequency operating time corresponds to the requested frequency.