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US 6,357,219 B1Granted
Turbine engine fuel control system
AssigneeAlliedSignal Inc.
InventorsJohn E. Dudd, Jr., Dennis G. Demers
Life of this patent
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AssigneeAlliedSignal Inc.
InventorsJohn E. Dudd, Jr., Dennis G. Demers
Estimating the term…
A turbine engine fuel delivery system (10) and method has, in addition to the conventional fuel bypass (20) for diverting fuel exiting a fuel control (17) away from the engine (49) and back to a fuel pump (15) to maintain a relatively constant pressure differential across the fuel control (17), a separate controllable flow fuel bypass (21) for selectively diverting fuel exiting the fuel control (17) away from the engine (49) and back to the fuel pump (15) to decrease the rate of fuel flow to the engine (49) and correct an overtemperature condition, and an arrangement for enabling the controllable fuel flow bypass (21) during engine (49) start-up and disabling the controllable fuel flow bypass (21) when the engine (49) reaches normal idle speed. Once an engine (49) start or light off is detected, the system (10) automatically prevents turbine outlet temperature exceedences by reducing metered fuel flow to the engine nozzle. The controllable fuel bypass (21) includes a solenoid operable valve (29). A controller (45) is responsive to sensed exhaust gas temperature and supplies a pulse width modulated control signal to the solenoid operable valve (29) which cyclically enables and disables the return flow of a portion of the fuel flow to the engine (49) from the main fuel control (17) back to the engine fuel pump (15). The period of cyclic enabling and disabling is fixed and the fraction of each cycle during which enabling occurs is controlled in accordance with the monitored exhaust gas temperature. The fuel bypass (21) includes a particulate matter filter (25, 31), a flow limiting orifice (27), and the solenoid actuatable valve (29), and a check valve (23) connected in series between the fuel control (17) and the fuel pump (15).
An aircraft having an engine, an engine exhaust gas temperature sensor and an engine fuel supply system including a fuel pump and a fuel control for controlling the flow of fuel from the pump to the engine, the improvement comprising:
A fuel delivery system, comprising a fuel control having a fuel control valve for supplying metered fuel flow to an engine and means for a first fuel bypass, a fuel pump for supplying fuel from a fuel source to the fuel control, the first fuel bypass means controlling the diversion of fuel away from the fuel control and back to the fuel pump to maintain a relatively constant pressure differential across the fuel control valve, a second fuel bypass operable independently of the first fuel bypass means and for diverting fuel exiting the fuel control away from the engine and back to the fuel pump to maintain an engine temperature below a threshold level, and means for enabling the second bypass upon engine light-off.
An engine fuel system that controls fuel flow to an engine, wherein fuel normally flows from an engine fuel pump through a main fuel control to the engine and a portion of fuel flow is diverted by a first bypass back to the fuel pump to maintain a relatively constant pressure differential at the fuel control, the system comprising:
Dependencies are inferred from the claim text.