Method and apparatus for operating turbo compressor using analog and digital control schemes
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United States of America Patent
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Apr 7, 1987
Issued Date -
N/A
app pub date -
Dec 18, 1984
filing date -
Feb 14, 1981
priority date (Note) -
Expired
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Abstract
A method and arrangement for controlling the operation of turbo compressors, particularly those of high capacity, utilizes flow rate and pressure values for an analog controller as well as a computing circuit to optimize the operation of the compressor. The compressor is assumed to have a characteristic basic linear blowoff line and an optimum non-linear blowoff line on its pressure/flow curve. The calculating or computing circuit computes an error signal representing a difference between the basic and optimum blowoff line at an operating pressure and applies the signal to the analog controller which controls the compressor to its optimum extent. An analog system connected to the controller maintains control at least according to the basic blowoff line if the computing circuit fails.
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