초록 ▼

To shorten the time length of a start phase of the operation of a two-shaft gas turbine engine, closed-loop control of the rate of fuel feed is performed based on the magnitude of deviation of actual rate of rotation of the gas generator shaft from a target value during a time period shortly after s

To shorten the time length of a start phase of the operation of a two-shaft gas turbine engine, closed-loop control of the rate of fuel feed is performed based on the magnitude of deviation of actual rate of rotation of the gas generator shaft from a target value during a time period shortly after starting of the engine, until actual speed of the power turbine sufficiently nears a target value, and then the basis of closed-loop control is switched over to the magnitude of deviation of actual speed of the power turbine from the target value. This method is practised by appropriately presetting the target value of the rotation rate of the gas generator shaft and by continuously making a comparison between the aforementioned two deviations and always selecting the smaller one of the two for use it as a feedback signal to produce a fuel feed rate control signal.

대표청구항 ▼

A system to control the rate of fuel feed to a two-shaft gas turbine engine in which a gas generator shaft and a power turbine shaft rotate independently of each other, the system comprising components for controlling said fuel feed rate initially in accordance with the rotation rate of said gas gen

A system to control the rate of fuel feed to a two-shaft gas turbine engine in which a gas generator shaft and a power turbine shaft rotate independently of each other, the system comprising components for controlling said fuel feed rate initially in accordance with the rotation rate of said gas generator shaft and thereafter in accordance with the rotation rate of said power turbine shaft, including: first means for continuously producing a first electrical signal representing the magnitude of a deviation of actual rate of rotation of the gas generator shaft from a target value; second means for continuously producing a second electrical signal representing the magnitude of a deviation of actual rate of rotation of the power turbine shaft from a target value; third means for continuously making a comparison between said first and second signals and providing a third electrical signal which corresponds to a smaller one of said first and second signals; said first means including means for presetting a low speed target value for the rate of rotation of the gas generator shaft during a first time period occurring shortly after starting the engine, so that the deviation of the rate of rotation of said gas generator shaft from said low target value represented by said first electrical signal is smaller than the deviation of the rate of rotation of the power turbine shaft represented by said second electrical signal during said first time period, and a higher speed target value thereafter, and fourth means for producing a fourth electrical signal which can serve as a fuel feed rate control signal by utilizing said third signal.