Modified start sequence of a gas turbine engine

US10787277B2 · kind B2 · utility

Assignee

• RAYTHEON TECHNOLOGIES CORPORATION · US

Inventors

• Matthew D. Teicholz · Mystic, US
• Jeffrey W. Sutliff · Town of West Hartford, US
• William H. Greene, JR. · Windom, US
• Kenneth J. White · Town of West Hartford, US
• Matthew R. Feulner · Town of West Hartford, US
• John P. Virtue, Jr. · Middletown, US
• Jorn A. Glahn · Manchester, US
• Philip D. Hoover · Glastonbury, US
• Victor M. Pinedo · Bridgeport, US
• Jason B. Solomonides · Cromwell, US

Key dates

• Filing date: Jul 13, 2018
• Grant date: Sep 29, 2020
• Expiry date: Dec 4, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2270/71
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

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.