Patent ID: 7036491

Claim:
A gas-supply system for an internal-combustion engine, comprising: a plurality of electromagnetically controlled injectors, associated to the various cylinders of the engine; a distribution manifold or rail communicating with said injectors; a reservoir for supply of the rail, where pressurized gas is accumulated; and a pressure-reducing valve set in connection between the reservoir and the aforesaid rail, in which said pressure-reducing valve comprises: a valve body, with an inlet connector, connected to the reservoir, and an outlet connector, connected to the rail; a restricted passage, defined inside the valve body for communication between the inlet connector and the aforesaid outlet connector; an open/close element for control of the communication through said restricted passage, said system being characterized in that: said pressure-reducing valve has an auxiliary connector that receives a pilot-pressure signal and is shaped to give rise to a pressure reduction from its inlet connector to its outlet connector, which is a function of said pilot-pressure signal; said system further comprises a pilot solenoid valve for supplying said pilot-pressure signal to the aforesaid auxiliary connector; said pilot solenoid valve has a solenoid that is supplied with an electric current which is variable for the purpose of varying the pilot-pressure signal that is supplied to said pressure-reducing valve; and the supply to the solenoid of the pilot solenoid valve is controlled by an electronic control unit according to a comparison of the signal issued by a pressure sensor indicating the pressure existing in the distribution manifold or rail, with a signal indicating a desired pressure inside the rail.