Device for regulating pressure/flow in an internal combustion engine fuel injection system

摘要

The injection system ( 1 ) includes a storage volume ( 6 ) of pressurized fuel supplied by a high-pressure pump ( 7 ) along a delivery pipe ( 8 ); and a control unit ( 16 ) for defining the required fuel pressure of the storage volume ( 6 ) as a function of the operating conditions of the engine ( 2 ). The regulating device includes a bypass solenoid valve ( 14 ); and a pair of non-return valves ( 32, 33 ) connected antiparallel and located between the bypass valve ( 14 ) and the storage volume ( 6 ). One of the non-return valves ( 32, 33 ) permits fuel drainage from the storage volume ( 6 ) to the bypass valve ( 14 ) when the control unit ( 16 ) defines a predetermined reduction (Deltap) in the fuel pressure of the storage volume ( 6 ).