The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1991
Filed:
Dec. 26, 1989
Clyde O Peterson, Plum Borough, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
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.