Patent ID: 7448220
Filing Date: 2008-11-11
Classification: F01D,F02C,F05D

Abstract:
1. A start system for a gas turbine engine to deliver starting current according to a schedule selected according to measured rotational speed and oil temperature of the gas turbine engine, comprising: a baseline starting current signal level source that produces a baseline starting current level signal that represents a baseline starting current needed to start the engine; an engine oil temperature sensor that produces an oil temperature signal representing oil temperature for the gas turbine engine; an engine rotational speed sensor that produces an engine rotational speed signal representing rotational speed of the engine; an offset current selector that produces an offset current signal level that represents an offset current needed to add to the baseline starting current to start the gas turbine engine based upon the engine oil temperature signal and the engine rotational speed signal; and a summer that combines the offset current selector output with the baseline current starting signal to produce a compensated current starting command signal that shifts in current level according to engine oil temperature and engine rotational speed conditions.