PRESSURE COMPENSATION CONTROL OF A FIXED DISPLACEMENT PUMP IN A PUMPING AND METERING SYSTEM AND ASSOCIATED METHOD

摘要

A fuel system includes a pump unit having at least a fixed displacement pump supplying pressurized flow. A fuel control assembly receives flow from the pump unit and includes at least one metering valve and at least one throttling valve. A control (bypass valve control) for the fixed displacement pump receives first and second pressure signals indicative of a pressure differential across the throttling valve, or across the metering valve/throttling valve combination, for altering output from the fixed displacement pump in response to the pressure differential. In other embodiments, the pump unit includes a centrifugal pump and a fixed displacement pump that can be fully or partially redundant depending on sizing of the pumps, and the system requirements.

主权项

1. A fuel system comprising:
a pump unit that supplies pressurized flow, the pump unit includes a first pump that communicates with an inlet of a second pump, at least one of the first and second pumps being a fixed displacement pump; a fuel control assembly receiving flow from the pump unit, the fuel control assembly including at least one metering valve and at least one throttling valve; and a control for the fixed displacement pump receiving first and second signals indicative of a pressure differential across at least the throttling valve, or across the metering valve/throttling valve combination, for altering operation of the fixed displacement pump in response to the pressure differential.