| 摘要 |
A fuel supply system for an aircraft (10) for delivering in use fuel from a fuel tank (20) to an aircraft powerplant (12), comprises a fuel flow passage (18) along which in use fuel may flow from said tank (20) to said powerplant (12), the fuel flow passage (18) having a downstream end adjacent the powerplant and an upstream end adjacent the fuel tank, a downstream pump (14) associated with said powerplant (12) for drawing fluid along said flow path to supply it to said powerplant in use, an upstream pump (22) disposed in or associated with said fuel tank (20) and operable to pump fluid along said flow passage (18), a pressure sensor (30) for monitoring the inlet pressure to said downstream pump (14), and a fuel system controller (32) responsive to said pressure sensor (30) to control said upstream pump (22) to maintain the pressure at the inlet to said downstream pump (14) at or above a predetermined threshold pressure. Instead of being responsive to the absolute pressure upstream of the downstream pump, the fuel controller may respond to a pressure measurement downstream of the downstream pump. |
