Injection systems for ic engines
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Means to maintain said mechanical mode spring in an inoperable position during the primary fluid control mode of operation an elongate body having a bore therein Ī fuel nozzle at an inner end of said body for projecting within an associated cylinder combustion chamber for delivery of fuel therein, a fuel chamber adjacent the fuel nozzle and having pressurized fuel therein, and a valve seat between the fuel nozzle and fuel chamber Ī valve mounted within said bore on said valve seat and movable between open and closed positions relative to said valve seat and said nozzle, said valve being in communication with pressurized fuel in said fuel chamber and urged toward an open unseated position by said pressurized fuel for providing fuel to said nozzle for discharge into an associated cylinder Ī pressurized control fluid chamber in said body adjacent said valve and having pressurized control fluid therein for urging said valve toward a closed seated position on said valve seat to block the flow of fuel to said nozzle under a primary fluid control mode of operation Ī mechanical mode spring in said body operable upon the decrease in pressure of said control fluid below a predetermined minimum amount for urging said valve toward a seated closed position on said valve seat, said mechanical mode spring comprising a compression spring acting against the outer end of said valve for urging said valve toward a seated position and.An improved fuel injector adapted for use with a fuel injection system for a multi-cylinder internal combustion engine including a control fluid pressure source and a pressurized fuel source, said fuel injector comprising: