Patent ID: 6595189
Filing Date: 2003-07-22
Classification: F02M

Abstract:
A mechanically actuated direct control fuel injection system comprising:a plurality of mechanically actuated fuel injectors including an injector body, each of said injector bodies defining a fuel pressurization chamber, a needle control chamber, a fuel inlet and a spill passage; a noise producing linkage coupling each of said fuel injectors to an engine; a direct control needle valve being movably positioned in each of said plurality of fuel injectors and including a closing hydraulic surface exposed to fluid pressure in said needle control chamber; a spill valve member being positioned in each of said plurality of fuel injectors and being movable between an open position in which said fuel pressurization chamber is open to said fuel inlet and a closed position in which said fuel pressurization chamber is blocked from said fuel inlet; and a flow restriction positioned in said spill passage and having a flow area sufficiently small to reduce noise produced by said noise producing linkage to below a predetermined noise level and sufficiently large to maintain energy losses due to said flow restriction below a predetermined loss level.