Patent ID: 7237382
Filing Date: 2007-07-03
Classification: F02C,F05D

Abstract:
1. A system for controlling a gas-turbine engine having two turbines including at least a low-pressure turbine and a high-pressure turbine, comprising: at least one speed sensor generating an output indicative of a rotational speed of the low-pressure turbine; at least one speed sensor generating an output indicative of a rotational speed of the high-pressure turbine; a temperature sensor generating an output indicative of a temperature of exhaust gas exiting the low-pressure turbine; and a first control channel inputting the outputs of the sensors and controlling supply of fuel to the engine based on at least one of the inputted outputs; wherein the first control channel includes: a comparator inputting the outputs generated by the sensors and comparing change rates or difference of the outputs with corresponding threshold values once every predetermined time period; and a transient/steady-state discriminator discriminating that the engine is in a transient state when the number of the outputs found to be equal to or greater than the corresponding threshold values are equal to or greater than a predetermined value, while discriminating that the engine is in a steady state when the number of times that the outputs are found to be smaller than the corresponding threshold values is more than half of number of comparison times.