Electronic fuel control system for gas turbine

• US 4,506,504 A
• Filed: 03/31/1983
• Issued: 03/26/1985
• Est. Priority Date: 03/31/1983
• Status: Expired due to Fees

• Current Assignee: Dresser-Rand Company Corning New York A General Partnership of New York
• Original Assignee: Dresser Industries Incorporated (Halliburton Company)
• Inventors: Nick, Charles F.
• Primary Examiner(s): Casaregola, Louis J.
• Application Number:
  US06/481,089
• Time in Patent Office: 726 Days
• Field of Search: 60/39.281
• US Class Current: 60/39.281
• CPC Class Codes: F01D 21/12 responsive to temperature
• CPC Class Codes: F02C 9/28 Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed F02C9/30 - F02C9/38, F02C9/44 take precedence

Abstract

An electronic engine control for a gas turbine monitors a plurality of speed and temperature parameters. For each of the parameters a setpoint signal is produced that can be either fixed or variable and which is compared against the parameter signal to produce a difference signal proportional to the amplitude and rate of change of the difference between the parameter and setpoint signal.

A gas generator minimum control signal is high selected with a power turbine minimum speed signal. The resulting high selected signal is then low selected with the power turbine average temperature and gas generator control signals. A low selection provides for fuel control to drive the most extreme variable parameter back to its setpoint by means of a feedback loop to an output driver circuit within a fuel valve card. The selected control signal is passed through a maximum speed integrator and a feedback loop to set the position of the fuel valve while feedback signals to two feedback loops are provided by a valve position signal monitoring a valve actuator. Failure to eliminate offset of the power turbine temperature signal from the power turbine temperature average for more than a fixed time produces a deviation signal to effect turbine shut down.

Claims

1. An electronic engine control for operating a fuel valve of a gas turbine, comprising:

means for monitoring a plurality of parameters for said gas turbine to produce a plurality of parameter signals,

means for generating a setpoint signal for each of said parameter signals,

means for comparing each of said parameter signals with the respective setpoint signals to produce a control signal,

means connected to receive said control signal and at least one alternate condition control signal for amplitude selecting one of said control signals,

means for integrating said selected control signal to produce an integrated control signal,

a summation circuit having a first input connected to receive said integrated control signal and produce a fuel valve control signal for setting the position of said fuel valve,

means for monitoring said fuel valve position to produce a valve position signal,

a differential amplifier having the first input thereof connected to receive said integrated control signal and the second input thereof connected to receive said valve position signal, said amplifier producing a differential output signal,

means for integrating said differential output signal and supplying said integrated differential output signal to the second input of said summation circuit, and

means connected to receive said differential output signal for generating a failure signal when said differential output signal has been offset from a set amplitude for more than a predetermined time.

2. An electronic engine control as recited in claim 1 including:

means for driving said fuel valve to an off position upon the generation of said failure signal.

3. A method for operating a fuel valve of a gas turbine, comprising the steps of:

generating a parameter signal for each of a plurality of gas turbine parameters,

generating a respective setpoint signal for each of said parameter signals,

comparing each of said parameter signals to the corresponding setpoint signal to produce a control signal,

amplitude selecting from one of either said control signal or at least one alternate control signal,

integrating said selected control signal to produce an integrated control signal,

summing said integrated control signal with an integrated valve position signal to produce a fuel valve control signal,

generating a valve position signal proportional to the position setting of said fuel valve,

generating a differential output signal proportional to the difference between said integrated control signal and said valve position signal,

integrating said differential output signal to produce said integrated valve position signal, and

generating a failure signal when said differential output signal has been offset from a set amplitude for more than a predetermined time.

4. A method as recited in claim 3 including the step of:

driving said fuel valve to an off position upon the generation of said failure signal.

5. A method as recited in claim 3 wherein the step of generating a failure signal comprises generating said failure signal when said differential output signal has been in a non-null state for more than a predetermined time.