Patent ID: 8245517
Filing Date: 2012-08-21
Classification: F01D,F02C,F05D

Abstract:
1. A system for starting a gas turbine engine, the system including: a starter-motor connected to rotate the gas turbine engine at a speed defined by a speed command value; and a controller for generating speed command values provided to the starter-motor to control the speed of the gas turbine engine, the controller providing speed command values that result in stepped increases in the speed of the gas turbine engine through a light-off window from a minimum speed value to a maximum speed value, with the speed of the gas turbine dwelling at each stepped speed command value for a period of time before the controller increments the speed command value to the next stepped level, wherein if the gas turbine engine is stepped through the entire light-off window without success, the controller decreases the speed of the gas turbine engine to the minimum speed value and repeats the stepped traversal of the light-off window.