Device for controlling the flow of a high-pressure pump in a common-rail fuel injection system of an internal combustion engine
AssigneeC.F.R. Societa Consortile per Azioni
InventorsMario Ricco, Stefano Maria Borrione
Life of this patent
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Abstract
The common rail supplies a number of injectors of the cylinders of the engine, and is supplied by a constant-displacement high-pressure pump in turn supplied by a low-pressure, variable-delivery, variable-pressure, motor-driven pump. The control device has an electronic control unit for receiving signals indicating operating conditions of the engine; the suction side of the high-pressure pump has a choke; and the control unit controls the motor-driven pump to vary the fuel pressure upstream from the choke between a predetermined maximum value and a predetermined minimum value, so as to regulate the fuel intake of the high-pressure pump within a predetermined range.
Claims13
A device for controlling the flow of a high-pressure pump in a common-rail fuel injection system of an internal combustion engine, wherein said high-pressure pump is a constant-displacement type and is supplied with fuel by a low-pressure, variable-delivery, variable-pressure motor-driven pump, the device comprising:
- a choke on the suction side of said high-pressure pump;
- and
- means for controlling said low-pressure pump to vary fuel pressure upstream from said choke between a maximum predetermined value and a minimum predetermined value, so as to regulate fuel intake by said high-pressure pump within a predetermined range, said means comprising an electronic control unit for receiving signals indicating the operating conditions of the engine and unit controlling said motor-driven pump as a function of said signals;
- wherein said control unit receives signals indicating the fuel pressure upstream from said choke and feedback-controls said motor-driven pump.
Dependencies are inferred from the claim text.