초록 ▼

An electronic circuit is used to control a gas turbine engine primarily as a function of turbine inlet temperature and compressor speed and in particular includes a speed governing loop to control compressor speed according to throttle position and modified by a temperature limiting compensation loo

An electronic circuit is used to control a gas turbine engine primarily as a function of turbine inlet temperature and compressor speed and in particular includes a speed governing loop to control compressor speed according to throttle position and modified by a temperature limiting compensation loop which accurately sets the turbine inlet temperature limit according to a schedule which avoids engine surge and destructive temperatures. The compensation loop is particularly designed to provide quick response to acceleration demands and a smooth transition to temperature limiting. A start fuel schedule circuit is also used to moderate the speed loop during engine starting.

대표청구항 ▼

In a fuel control system for a gas turbine engine having means for generating a turbine inlet temperature signal, means for generating a turbine speed signal, and means for controlling fuel flow to the engine in response to a fuel control signal; means for producing said fuel control signal comprisi

In a fuel control system for a gas turbine engine having means for generating a turbine inlet temperature signal, means for generating a turbine speed signal, and means for controlling fuel flow to the engine in response to a fuel control signal; means for producing said fuel control signal comprising a speed governing circuit having a throttle signal input requesting a certain turbine speed, means comparing the throttle signal with the turbine speed signal to produce a speed error signal, a compensation loop having a differentiating circuit responsive to a rapid increase in the speed error signal for subtracting a variable compensation signal from the speed error signal to produce the fuel control signal which therefore is constrained in its rate of increase, the compensation loop including a step ramp generator programmed according to the temperature signal for offsetting at least a portion of the compensation signal to limit the response of the compensation signal to high change rates of the speed error signal, thereby allowing moderate increases in the speed error signal to be immediately reflected in the fuel control signal, the step ramp generator further gradually decreasing the compensation signal to allow an increasing fuel control signal following the rapid increase in the speed error signal, and engine temperature limiting means including means for establishing an engine temperature limit schedule to provide a schedule signal, comparator means for comparing the turbine temperature signal and the schedule signal to produce a temperature error signal, the compensation loop including integrator means responsive to the temperature error signal to vary the compensation signal to reduce the fuel control signal when turbine temperature exceeds the temperature schedule.