Electronic fuel control for a gas turbine engine
First Claim
1. An electronic fuel control for a gas turbine engine having a gas turbine gas generator and a separate power turbine driven by the gas generator, the control comprising means for generating a gas generator speed demand signal, a first difference amplifier for comparing said gas generator speed demand signal with a gas generator actual speed signal to produce a gas generator speed error signal, means for generating a power turbine speed demand signal, a second difference amplifier for comparing the power turbine speed demand signal with a power turbine actual speed signal to produce a power turbine speed error signal, an error signal selection circuit connected to said difference amplifiers and arranged to pass forward the lower of said error signals, an acceleration control connected to limit the magnitude of the selected error signal, an integrator for integrating the selected error signal, an output difference amplifier for comparing the output of the integrator with the gas generator actual speed signal to produce a fuel error signal and a fuel flow control device sensitive to said fuel error signal to vary the flow of fuel to the engine.
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Accused Products
Abstract
An electronic fuel control for a gas turbine engine having a gas generator and a separate power turbine includes gas generator and power turbine actual speed transducers, gas generator and power turbine desired speed signal generators, error amplifiers connected to the respective transducers and generators, a "low wins" gate for selecting the lower error, an acceleration control limiter passing the selected signal from the gate to an integrator and an output difference amplifier producing an output signal determined by the difference between the integrator output and that of the gas generator transducer to control the fuel flow to the engine.
29 Citations
5 Claims
- 1. An electronic fuel control for a gas turbine engine having a gas turbine gas generator and a separate power turbine driven by the gas generator, the control comprising means for generating a gas generator speed demand signal, a first difference amplifier for comparing said gas generator speed demand signal with a gas generator actual speed signal to produce a gas generator speed error signal, means for generating a power turbine speed demand signal, a second difference amplifier for comparing the power turbine speed demand signal with a power turbine actual speed signal to produce a power turbine speed error signal, an error signal selection circuit connected to said difference amplifiers and arranged to pass forward the lower of said error signals, an acceleration control connected to limit the magnitude of the selected error signal, an integrator for integrating the selected error signal, an output difference amplifier for comparing the output of the integrator with the gas generator actual speed signal to produce a fuel error signal and a fuel flow control device sensitive to said fuel error signal to vary the flow of fuel to the engine.
Specification