초록 ▼

A fuel injection system is provided with a purging device (14) for purging gas, including air and vapor, from the system. The device includes a pressure responsive valve (22) permitting gas to flow from an inlet (16) connected to the high pressure fuel injection line (8) to a vent outlet (18), and b

A fuel injection system is provided with a purging device (14) for purging gas, including air and vapor, from the system. The device includes a pressure responsive valve (22) permitting gas to flow from an inlet (16) connected to the high pressure fuel injection line (8) to a vent outlet (18), and blocking flow when gas has been purged from the system and fuel pressure rises. A first branch passage (24) communicates between the inlet (16) and one side (26) of the valve (22), and a second branch passage (28) communicates between the inlet (16) and the other side (30) of the valve (22) and also with the outlet (18). A restriction orifice (34) in the second branch passage (28) provides a fuel pressure drop thereacross but does not substantially drop gas pressure thereacross, such that pressurized fuel causes a higher pressure on the one side (26) of the valve (22) than on the other side (30) of the valve ( 22), which pressure differential closes the valve.

대표청구항 ▼

In a fuel injection system for an internal combustion engine having a fuel pump communicating with a fuel tank and delivering pressurized fuel through a pressure line to a fuel injector, the improvement comprising purging means for purging gas, including air and vapor, from said system, comprising:

In a fuel injection system for an internal combustion engine having a fuel pump communicating with a fuel tank and delivering pressurized fuel through a pressure line to a fuel injector, the improvement comprising purging means for purging gas, including air and vapor, from said system, comprising: a housing having an inlet communicating with said pressure line, and having an outlet; pressure responsive valve means in said housing movable between an open position permitting flow from said inlet to said outlet, and a closed position blocking flow from said inlet to said outlet; a first branch passage in said housing communicating between said inlet and one side of said valve means; a second branch passage in said housing communicating between said inlet and the other side of said valve means; restriction means in said second branch passage selected to provide a fuel pressure drop thereacross but not substantially dropping gas pressure thereacross, such that pressurized fuel in said inlet is transmitted through said first and second branch passages to respective said one and other sides of said valve means and causes a higher pressure on said one side of said valve means than on said other side of said valve means to close said valve means to said closed position, and such that gas in said inlet is transmitted through said first and second branch passages to respective said one and other sides of said valve means but does not cause sufficient pressure differential across said valve means to close same such that said valve means is in said open position.