METHOD AND SYSTEMS FOR CONTROLLING ENGINE THRUST USING VARIABLE TRIM
First Claim
1. A thrust control system for use in controlling the thrust output of a gas turbine engine, said thrust control system comprising:
- a first sensor for measuring a first engine operating parameter;
a second sensor for measuring a first engine condition parameter;
a processor programmed to;
determine an expected value of the first engine condition parameter using the measured first engine operating parameter value;
determine a first variance value, using a difference between the expected value of the first engine condition parameter and the measured first engine condition parameter;
determine a trim value for controlling the first engine operating parameter using the first variance value and a first engine operating parameter demand;
determine a modified operating parameter demand based on the nominal operating parameter demand and the determined trim value; and
a controller coupled to said processor for receiving the determined modified operating parameter demand value from the processor, said controller configured to control engine thrust based on the modified demand of the first engine operating parameter.
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Accused Products
Abstract
A method and systems for controlling a thrust output of a gas turbine engine are provided. The system includes a first sensor for measuring a first engine operating parameter, a second sensor for measuring a first engine condition parameter, and a processor programmed to determine an expected value of the first engine condition parameter and determine a first variance value using a difference between the expected value of the first engine condition parameter and the measured first engine condition parameter. The processor is further programmed to determine a trim value using the first variance value and a first engine operating parameter demand and to determine a modified operating parameter demand based on the nominal operating parameter demand and the determined trim value. The system also includes a controller coupled to the processor for controlling engine thrust based on the modified demand of the first engine operating parameter.
28 Citations
20 Claims
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1. A thrust control system for use in controlling the thrust output of a gas turbine engine, said thrust control system comprising:
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a first sensor for measuring a first engine operating parameter; a second sensor for measuring a first engine condition parameter; a processor programmed to; determine an expected value of the first engine condition parameter using the measured first engine operating parameter value; determine a first variance value, using a difference between the expected value of the first engine condition parameter and the measured first engine condition parameter; determine a trim value for controlling the first engine operating parameter using the first variance value and a first engine operating parameter demand; determine a modified operating parameter demand based on the nominal operating parameter demand and the determined trim value; and a controller coupled to said processor for receiving the determined modified operating parameter demand value from the processor, said controller configured to control engine thrust based on the modified demand of the first engine operating parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of automatically controlling a thrust output of a gas turbine engine, said method comprising:
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determining an expected value of the second engine parameter wherein the expected value is a value expected for an engine operating at current operating conditions; determining a difference between the expected value and the second engine parameter; determining an engine trim value using the difference; modifying a current demand of the first engine parameter using the engine trim value; and controlling the thrust output of the gas turbine engine using the modified current demand. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A gas turbine engine system comprising:
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a fan; and a thrust control system comprising; a first sensor operatively coupled to the gas turbine engine, said first sensor configured to measure a first engine parameter; a second sensor operatively coupled to the engine, said second sensor configured to measure a second engine parameter; a processor communicatively coupled to the first sensor and the second sensor, said processor programmed to determine an expected value of the second engine parameter using the first engine parameter, said processor further programmed to; generate a variance value using a difference between the expected value and the second engine parameter; generate a trim value using the variance value; and modify a current demand of the first engine parameter by the trim value; and a controller communicatively coupled to the processor and the gas turbine engine, said controller configured to control engine thrust using the modified current demand and the first operating parameter. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification