초록 ▼

A system and method provide dual level pressurization control of a fuel supply system based on whether fuel is being supplied to one or more secondary fuel loads. Fuel pump discharge backpressure is maintained above either a first minimum pressure value or a lower second minimum pressure value by de

A system and method provide dual level pressurization control of a fuel supply system based on whether fuel is being supplied to one or more secondary fuel loads. Fuel pump discharge backpressure is maintained above either a first minimum pressure value or a lower second minimum pressure value by determining whether fuel is being supplied to one or more secondary fuel loads. The fuel pump discharge pressure is maintained above the first minimum pressure value if it is determined that fuel is being supplied to the one or more secondary loads. The fuel pump discharge backpressure is maintained above the lower second minimum pressure value if it is determined that fuel is not being supplied to the one or more secondary loads.

대표청구항 ▼

What is claimed is: 1. A fuel pressurization control system, comprising:a secondary flow control valve including an inlet port and an outlet port, the inlet port adapted to receive fluid discharged from a fuel pump, the secondary flow control valve movable between a closed position, in which the inl

What is claimed is: 1. A fuel pressurization control system, comprising:a secondary flow control valve including an inlet port and an outlet port, the inlet port adapted to receive fluid discharged from a fuel pump, the secondary flow control valve movable between a closed position, in which the inlet port is fluidly isolated from the outlet port, and an open position, in which the inlet port is in fluid communication with the outlet port; anda pressurizing valve adapted to receive fuel discharged from the fuel pump at a pump discharge pressure, the pressurizing valve in fluid communication with at least the secondary flow control valve outlet port and comprising:a control pressure select piston responsive, at least in part, to fuel pressure at the secondary flow control valve outlet port to move between a first position and a second position, anda pressure control piston controllably movable to maintain the pump discharge pressure above (i) a first value when the control pressure select piston is in the first position and (ii) a second value when the control pressure select piston is in the second position.