Simplified fuel control for use with a positive displacement pump
AssigneeHamilton Sundstrand Corporation
InventorGerald P. Dyer
Life of this patent
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Abstract
A fuel flow control system to control fuel by regulating fuel pressure includes an inlet, an outlet, and a bypass passage. A variable orifice valve controls the flow of fuel between the inlet and the outlet in conjunction with a fixed orifice of an engine such that the relationship between pressure and fuel flow is substantially linear. A pressure-regulating valve accommodates pressure fluctuations in the system. A dual torque motor opens in proportion to the level of applied electrical current to control fuel pressure and thereby fuel flow.
Claims17
A fuel flow delivery system comprising;
- a pump for providing fuel flow at a pressure through an inlet;
- a fixed orifice through which fuel flows;
- a variable orifice operating in conjunction with said fixed orifice and including a flow area, said fuel flow area varying in proportion to fuel pressure such that a relationship between fuel flow and pressure is substantially linear;
- a pressure regulating valve in fluid communication with said variable orifice to control a pressure differential across said variable orifice;
- a pressure setting valve in fluid communication with said pressure regulating valve to adjust said pressure differential such that said fuel flow through said system is controlled by setting said pressure differential.
A fuel flow delivery system comprising;
- a pump for providing fuel flow at a pressure through an inlet;
- a fixed orifice through which fuel flows;
- a variable orifice operating in conjunction with said fixed orifice and including a flow area, an outlet and a passage, said flow area varying in proportion to fuel pressure such that a relationship between fuel flow and pressure is substantially linear, and said passage creating a pressure differential in fuel pressure between said inlet and said outlet;
- a pressure-regulating valve in fluid communication with said variable orifice valve to control said pressure differential;
- a pressure setting valve in fluid communication with said pressure regulating valve to adjust said pressure differential such that said flow fuel through said system is controlled by setting said pressure differential.
Dependencies are inferred from the claim text.