Patent ID: 6321527
Filing Date: 2001-11-27
Classification: F02C,Y02T

Abstract:
A bi-level hydraulic pressurization system for regulating a fluid output pressure comprising:a metering valve in fluid communication with an input flow of fuel at a fluid input pressure for regulating said input flow of fuel to produce a metered flow of fuel;a metering valve window within said metering valve, wherein said metered flow of fuel is controlled by the area of said metering valve window and the pressure drop across said metering valve;a pressure regulating valve in fluid communication with said input flow of fuel and said metered flow of fuel for regulating the pressure drop across said metering valve, wherein said pressure regulating valve provides a signal when said fluid input pressure is greater than a first value; anda pressurizing means for controlling a fluid output pressure of said metered flow of fuel responsive to said signal for regulating said fluid output pressure to a first minimum pressure when said fluid input pressure is less than said first value and for regulating said fluid output pressure to a second minimum pressure when said fluid input pressure is greater than said first value.