High accuracy fuel metering system for turbine engines
First Claim
1. A fuel control system for metering fuel in a turbine engine, said system comprising:
- a boost pump receiving fuel from a fuel tank and increasing pressure of the fuel;
a piston pump including first and second pistons slidably and rotatably mounted in a housing for boosting the fuel pressure to levels required by the turbine engine and for metering an amount of fuel delivered to the turbine engine; and
a speed controlled electric motor driving said piston pump.
1 Assignment
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Accused Products
Abstract
A fuel control system (10) in a turbine engine includes a centrifugal boost pump (20) that receives fuel from a fuel tank and increases the pressure of the fuel. A piston pump (40) boosts the fuel pressure to levels required by the turbine engine and meters an amount of fuel delivered to the turbine engine. A speed controlled electric motor (30) drives the piston pump (40). The electric motor (30) is driven by an electronic speed control wherein by controlling motor speed, fuel flow to the turbine engine is controlled, and fuel flow is directly proportional to the speed of the motor (30). Accordingly, the system (10) seeks precision of fuel control that can be achieved with an accuracy of better than +/−3% over a 30:1 fuel flow range.
36 Citations
12 Claims
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1. A fuel control system for metering fuel in a turbine engine, said system comprising:
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a boost pump receiving fuel from a fuel tank and increasing pressure of the fuel; a piston pump including first and second pistons slidably and rotatably mounted in a housing for boosting the fuel pressure to levels required by the turbine engine and for metering an amount of fuel delivered to the turbine engine; and a speed controlled electric motor driving said piston pump. - View Dependent Claims (2, 3, 9, 10, 11, 12)
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4. A fuel control system for metering fuel in a turbine engine, said system comprising:
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a boost pump receiving fuel from a fuel tank and increasing pressure of the fuel; a piston pump for boosting the fuel pressure to levels required by the turbine engine and for metering an amount of fuel delivered to the turbine engine; and a speed controlled electric motor driving said piston pump;
said system further comprising;a solenoid for directing flow of the fuel to a discharge port when said solenoid is in “
on”
condition or returns the fuel to an inlet of a fuel filter when said solenoid is in the “
off”
condition, wherein said solenoid providing an independent on/off control of fuel to the turbine engine. - View Dependent Claims (5, 6)
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7. A fuel control system for metering fuel in a turbine engine, said system comprising:
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a boost pump receiving fuel from a fuel tank and increasing pressure of the fuel; a piston pump for boosting the fuel pressure to levels required by the turbine engine and for metering an amount of fuel delivered to the turbine engine; and a speed controlled electric motor driving said piston pump; wherein said electric motor is a three phase brushless DC motor and said boost pump is centrifugal. - View Dependent Claims (8)
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Specification