Gas feeding system for an internal combustion engine, having a pressure reducing valve and a pressure regulating solenoid valve

摘要

In a gas-supply system for internal-combustion engines, a pressure-reducing valve (7) is set between the reservoir (3) of the gas and a distribution manifold or rail (2) that feeds the gas to a series of electromagnetically controlled injectors (1) associated to the various cylinders of the engine. The reduced pressure supplied by the pressure-reducing valve (7) is further reduced via a pressure-regulating solenoid valve (83), to an extent that depends upon the supply current of its solenoid (99). The electrical supply to the solenoid (99) of said solenoid valve (83) is controlled by an electronic control unit (C) according to the signal issued by a sensor (8) of the pressure in the rail (2) and according to stored maps, which supply the optimal pressure value for each operating condition of the engine.