초록 ▼

An integrated control system for a gas turbine engine of the turbofan type receives signals from a plurality of engine sensors and from the engine operator and generates control signals therefrom. A first control signal regulates the fan exhaust nozzle area in order to control inlet throat Mach numb

An integrated control system for a gas turbine engine of the turbofan type receives signals from a plurality of engine sensors and from the engine operator and generates control signals therefrom. A first control signal regulates the fan exhaust nozzle area in order to control inlet throat Mach number to maintain a low level of engine noise. Additional control signals regulate fuel flow to control engine thrust and fan pitch to control fan speed. A plurality of schedules are utilized to maintain a predetermined relationship between the controlled parameters and a number of fixed and calculated limits can override the control signals to prevent unsatisfactory engine performance.

대표청구항 ▼

In a gas turbine engine of the turbofan type which includes a wall spaced apart from a core engine to define a bypass duct therebetween, said duct including an inlet and a variable area fan exhaust nozzle, a control system comprising: means for generating a signal representative of the actual inlet

In a gas turbine engine of the turbofan type which includes a wall spaced apart from a core engine to define a bypass duct therebetween, said duct including an inlet and a variable area fan exhaust nozzle, a control system comprising: means for generating a signal representative of the actual inlet throat Mach number; means for generating an inlet throat Mach number reference signal; means for comparing said signals to generate a difference signal; actuator means responsive to said difference signal for modifying said fan exhaust nozzle area; means for generating a signal representative of the actual engine thrust; means for generating a signal representative of the engine power setting; means for modifying said power setting signal in response to existing operating conditions to create a thrust demand signal; means for comparing said actual thrust signal with said thrust demand signal to generate a thrust difference signal; and actuator means responsive to said thrust difference signal for modifying engine fuel flow.