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:
Sep. 29, 2020
Filed:
Jul. 13, 2018
United Technologies Corporation, Farmington, CT (US);
Matthew D. Teicholz, Mystic, CT (US);
Jeffrey W. Sutliff, West Hartford, CT (US);
William H. Greene, Jr., Coventry, CT (US);
Kenneth J. White, West Hartford, CT (US);
Matthew R. Feulner, West Hartford, CT (US);
John P. Virtue, Jr., Middletown, CT (US);
Jorn A. Glahn, Manchester, CT (US);
Philip D. Hoover, Glastonbury, CT (US);
Victor M. Pinedo, Bridgeport, CT (US);
Jason B. Solomonides, Cromwell, CT (US);
RAYTHEON TECHNOLOGIES CORPORATION, Farmington, CT (US);
Abstract
A system for starting a gas turbine engine of an aircraft is provided. The system includes a pneumatic starter motor, a discrete starter valve switchable between an on-state and an off-state, and a controller operable to perform a starting sequence for the gas turbine engine. The starting sequence includes alternating on and off commands to an electromechanical device coupled to the discrete starter valve to achieve a partially open position of the discrete starter valve to control a flow from a starter air supply to the pneumatic starter motor to drive rotation of a starting spool of the gas turbine engine below an engine idle speed, where the controller modulates a duty cycle of the discrete starter valve via pulse width modulation.