Method of controlling a position actuation system component for a gas turbine engine

Patent metadata

Field	Value
Publication number	US-9909442-B2
Application number	US-201514790458-A
Country	US
Kind code	B2
Filing date	Jul 2, 2015
Priority date	Jul 2, 2015
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A method for controlling a position actuation system component in a gas turbine engine based on a modified proportional and integral control loop is provided. The method includes determining an error value between a demand signal for the position actuation system component and a position signal for the position actuation system component. The method also includes determining an integral gain scaler as a function of a scheduling parameter value and determining an integral gain based on the determined error value and the determined integral gain scaler. Additionally the method includes determining a proportional gain scaler as a function of the scheduling parameter value and determining a proportional gain based on the determined error value and the determined proportional portion gain scaler. The method adds the determined integral gain with the determined proportional gain to determine a null current value for the position actuation system component.

First claim

What is claimed is:

1. A method for controlling a position actuation system component in a gas turbine engine, the method comprising:
determining an error value between a demand signal for the position actuation system component and a position signal of the position actuation system component by a controller;
determining a scheduling parameter value of the gas turbine engine by a sensor, wherein the scheduling parameter value is a core speed of the gas turbine engine; and
determining a null current value for the position actuation system component by the controller, wherein determining the null current value includes:
determining an integral gain scaler based on the scheduling parameter value;
determining an integral gain based on the error value and the integral gain scaler;
determining a proportional gain scaler based on the scheduling parameter value;
determining a proportional gain based on the error value and proportional gain scaler;
adding the integral gain and the proportional gain to determine the null current value; and
using the null current value to set the position actuation system at a desired position.

2. The method of claim 1 , wherein the position actuation system component is a fuel metering valve.

3. The method of claim 1 , wherein determining the null current value further includes
determining a null current offset value as a function of the scheduling parameter value; and
adding the null current offset value to the integral gain and the proportional gain to determine the null current value.

4. The method of claim 3 , wherein determining the null current offset value based on the scheduling parameter value includes
determining a first baseline null current-scheduling parameter model for the gas turbine engine; and
determining the null current offset value based on the scheduling parameter value and the first baseline null current-scheduling parameter model.

5. The method of claim 4 , wherein determining the first baseline null current-scheduling parameter model includes determining the first baseline null current-scheduling parameter model using testing data of the gas turbine engine.

6. The method of claim 4 , wherein the baseline null current-scheduling parameter model is a two-variable linear equation model including as variables the null current value and the scheduling parameter value, the first baseline null current-scheduling parameter model taking the form of: y=mx+b, wherein y is the null current value, x is the scheduling parameter value, and m and b are constants.

7. The method of claim 3 , wherein determining the null current offset value based on the scheduling parameter value includes
determining a first baseline null current-scheduling parameter model for the gas turbine engine;
determining an second baseline null current-scheduling parameter model by updating the first baseline null current-scheduling parameter model using real-time operational data of the gas turbine engine, wherein the second baseline null current-scheduling parameter model is an adaptive model; and
determining the null current offset value based on the scheduling parameter value and the second baseline null current-scheduling parameter model.

8. The method of claim 7 , wherein the real-time operational data of the gas turbine engine includes the null current value and the scheduling parameter value in real time.

9. The method of claim 7 , wherein determining the second baseline null current-scheduling parameter model by updating the first baseline null current-scheduling parameter model includes recursively estimating the second baseline null current-scheduling parameter model.

10. The method of claim 9 , wherein recursively estimating the second baseline null current-scheduling parameter model includes using a least mean squares algorithm.

11. The method of claim 1 , wherein determining the integral gain scaler based on the scheduling parameter value includes determining the integral gain scaler based on the scheduling parameter value and the error value, and wherein determining the integral gain based on the error value and the integral gain scaler includes multiplying a sum of the integral gain scaler and an initial integral gain by the error value.

12. The method of claim 1 , wherein determining the proportional gain scaler based on the scheduling parameter value includes determining the proportional gain scaler based on the scheduling parameter value and the error value, and wherein determining the proportional gain based on the error value and the proportional gain scaler includes multiplying a sum of the proportional gain scaler and an initial proportional gain by the error value.

13. The method of claim 1 , further comprising
providing an electrical current equal to the null current value to a position controller for the position actuation system component.

14. A gas turbine engine comprising:
a combustor assembly disposed between a compressor section and a turbine section;
a fuel metering valve controlling an amount of fuel provided to the combustor assembly;
a sensor for determining a scheduling parameter value of the gas turbine engine, wherein the scheduling parameter value is a core speed of the gas turbine engine; and
a controller operably connected to the fuel metering valve and the sensor, the controller configured to
determine an error value between a fuel metering valve demand signal and a position of the fuel metering valve;
determine an integral gain scaler based on the scheduling parameter value; determine an integral gain based on the error value and the integral gain scaler;
determine a proportional gain scaler based on the scheduling parameter value;
determine a proportional gain based on the error value and proportional gain scaler;
add the integral gain and the proportional gain to determine a null current value; and
use the null current value to set the position actuation system at a desired position.

15. The gas turbine engine of claim 14 , wherein in determining the null current value, the controller is further configured to determine a null current offset value based on the scheduling parameter value; and add the null current offset value to the integral gain and the proportional gain to determine the null current value.

16. The gas turbine engine of claim 15 , wherein in determining the null current offset value, the controller is further configured to
determine a first baseline null current-scheduling parameter model for the gas turbine engine; and
determine the null current offset value based on the scheduling parameter value and the first baseline null current-scheduling parameter model.

17. The gas turbine engine of claim 15 , wherein in determining the null current offset value, the controller is further configured to
determine a first baseline null current-scheduling parameter model for the gas turbine engine;
determine an second baseline null current-scheduling parameter model by updating the first baseline null current-scheduling parameter model using real-time operational data of the gas turbine engine, wherein the second baseline null current-scheduling parameter model is an adaptive model; and
determine the null current offset value based on the scheduling parameter value and the second baseline null current-scheduling parameter model.

18. The gas turbine engine of claim 14 , wherein the gas turbine engine is an aeroderivative gas turbine engine.

Assignees

• Gen Electric

Inventors

• Desai Premal
• Striker John A
• Meiners Kenneth Paul

Classifications

• F02C9/28

  Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed (F02C9/30 - F02C9/38, F02C9/44 take precedence) · CPC title

• F02C7/232

  Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) · CPC title

• F02C9/263 Primary

  by means of fuel metering valves · CPC title

• G01M15/14

  Testing gas-turbine engines or jet-propulsion engines · CPC title

• F05D2220/32

  in gas turbines · CPC title