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US 10,605,174 B2Granted
Fuel flow control
AssigneeROLLS-ROYCE plc
InventorsArthur L Rowe, Alexander MacDonald
Life of this patent
Estimating the term…
Abstract
A method (30) of controlling fuel flow in a gas turbine engine. First, detect a surge condition. Set fuel flow demand (Wf_D) proportional to compressor discharge pressure (P30). Detect actual fuel flow (Wf_A). Then apply an enhanced schedule (50) for fuel flow demand (Wf_D) while fuel flow demand (Wf_D) is less than a predefined proportion (k) of actual fuel flow (Wf_A). Also a gas turbine engine (10), fuel flow system (68) and fuel flow control system (76) each implementing the method (30).
Claims12
A method of controlling fuel flow in a gas turbine engine, the method comprising:
- a. in response to a detected surge condition that occurs while controlling the fuel flow according to fuel control laws, setting a fuel flow demand (Wf_D) proportional to compressor discharge pressure (P30), such that the fuel flow demand (Wf_D) varies with varying compressor discharge pressure (P30);
- b. detecting actual fuel flow (Wf_A);
- and
- c. applying a rate accelerator or a step change to the fuel flow demand (Wf_D) that has been set in response to the detected surge condition to provide a first rate of increase of the fuel flow demand (Wf_D), while the fuel flow demand (Wf_D) is less than a predefined proportion (k) of the actual fuel flow (Wf_A), the first rate of increase being greater than a rate of increase that would have occurred in response to the detected surge condition under the fuel control laws that were being used prior to setting the fuel flow demand (Wf_D) proportional to the compressor discharge pressure (P30).
1 more element
Dependencies are inferred from the claim text.