Pumps – With condition responsive pumped fluid control – Plural separate sensing means for a single fluid controller
Patent
1989-12-26
1991-07-16
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Plural separate sensing means for a single fluid controller
417295, 417310, F04B 4900
Patent
active
050320629
ABSTRACT:
In a compressor control system, surge upon a sharp demand for lower airflow is avoided by placing an offset value above the minimum airflow absolute limit. When reaching downward under inlet valve modulation such offset limit, the master-controller initiates bypass valve modulation and a subcontroller brings the inlet valve from the offset limit down to the absolute minimum airflow position. Provision is made against exceeding the offset limits during such excessive demand downward by imposing a limit to the inlet valve position command. Upon a return upward toward normal operation, provision is made against an intervening and sudden downward demand by imposing a limit to the inlet valve position command representing the minimum airflow operation.
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Lorin C. M.
Scheuermann David W.
Smith Leonard E.
Westinghouse Electric Corp.
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