Patents by Inventor Stephen P. Doherty, Jr.

Stephen P. Doherty, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Control system for modulating bleed in response to engine usage
    Patent number: 6141951
    Abstract: A control system for operating a compressor bleed valve in a gas turbine engine to prevent compressor operation in surge region determines engine stability in response to a plurality of sensed engine parameters, and calculates and stores engine parameters to estimate compressor performance relative to a stability limit which is indicative of a surge operation. The control system further maintains a rolling average of the estimate of compressor performance for up to a predetermined number of engine flights. This rolling average of the estimate of compressor performance is indicative of engine usage and associated engine degradation. The control system determines a bias for the bleed valve in response to calculated engine parameters and adjusts the operation of the bleed valve in response to the compressor performance so as not to exceed the stability limit.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: November 7, 2000
    Assignee: United Technologies Corporation
    Inventors: Leon Krukoski, Nicola Laudadio, Stephen P. Doherty, Jr., Merrill L. Kratz