ELECTRONIC UNIT REDUCING OR REGULATING THE PRESSURE TO FEED GAS, IN PARTICULAR METHANE OR HYDROGEN TO AN INTERNAL COMBUSTION ENGINE, AND GAS POWER SUPPLY SYSTEM INCLUDING THIS UNIT.

摘要

Gas supply system, in particular for the supply of methane or hydrogen to an internal combustion engine, comprising: - a plurality of electromagnetically controlled injectors (1), associated with the various cylinders of the engine; - a distribution manifold or rail (2) that communicates with said injectors (1); - a tank (3) for supplying the gas to the distribution manifold (2), in which the gas under pressure is accumulated; and - a pressure reduction valve (7) established at the connection between the tank (3) and the above-mentioned distribution manifold (2), wherein said pressure reduction valve comprises: - an intake connected to the tank (3) and an outlet connected to the distribution manifold (2), as well as an auxiliary intake; and - valve means (9, 16, 17, 20, 21), designed to determine a reduction in gas pressure in the passage from said inlet to said outlet, said pressure reduction depending on a sent pressure signal to said auxiliary intake, wherein said system also comprises a modulation solenoid valve (25) for sending said pressure signal to said auxiliary admission, said modulation solenoid valve comprising: - an intake communicating with the fuel tank (3); - an outlet that communicates with the auxiliary intake of the pressure reduction valve (7), as well as with the distribution manifold (2); - a solenoid for controlling a mobile anchor that controls the communication between the intake and the output of the modulation solenoid valve (25) so that it carries out a previously determined reduction in the gas pressure in the passage from the intake to the output of the modulation solenoid valve (25), said gas supply system also comprising electronic means for controlling the solenoid of said modulation solenoid valve (25), said electronic means being provided for comparing a signal indicating the effective pressure (P rail) that exists in the distribution manifold or rail (2) with a pressure reference signal and to control, on the basis of said comparison according to a closed loop logic, the solenoid (39) of the modulation solenoid valve (25), in which: - the pressure reduction valve (7) and the modulation solenoid valve (25 ) are integrated in the body (44) of a single electronic pressure reducing or pressure regulating unit (43), - are provided in said body (44): - the intake (61) for the gas coming from the tank fuel (3); - the outlet (55) for the gas that is supplied to the distribution manifold or rail (2); - a step (56) for communication between the intake (61) and the pressure reducing valve (7); - a step (56, 64) for communication between the intake (61) and the modulation solenoid valve (25); - a passage (58) for communication between the modulation solenoid valve (25) and the pressure reduction valve (7); - a passage (58, 70-72) for communication between the modulation solenoid valve (25) and the output (55); and - a step for communication (54) between the pressure reducing valve (7) and the outlet (55), said system being characterized in that said unit (43) also incorporates an electronic control module (77) to control the solenoid (39) of the modulation solenoid valve (25), said electronic control module (77) comprising which is incorporated in said unit (43) the electronic means (110) mentioned above to compare the signal indicating the effective pressure (Prail) in the distribution manifold or rail (2) with the pressure reference signal and to control, on the basis of said comparison, according to a closed loop logic, the solenoid (39) of the modulation solenoid valve (25) and said system being also characterized in that the passage (58, 70-72) integrated in the body of said unit (43) which establishes in direct communication the output of the modulation solenoid valve (25) with the distribution manifold or rail (2), includes a limited section defined by a hole (71) of previously determined dimensions.