Patent ID: 6532943
Filing Date: 2003-03-18
Classification: F02M

Abstract:
A fuel injector for use in an internal combustion engine comprising a fuel injector housing including an inlet port for said fuel, a spill port for release of said fuel, a working chamber, a piston disposed for reciprocal movement within said working chamber, a plunger attached to said piston, a nozzle for injecting said fuel into said internal combustion engine in response to the action of said plunger, a hydraulic valve movable between a closed position, an open position, and at least one intermediate position therebetween, said hydraulic valve including a first side and a second side, said first side of said hydraulic valve facing a control chamber and said second side of said hydraulic valve facing a poppet chamber, whereby said hydraulic valve moves between said control chamber and said poppet chamber, said hydraulic valve including a poppet defining said poppet chamber, said poppet including a first side and a second side, said first side of said poppet defining said poppet chamber and being in communication with said inlet port and said second side of said poppet being in communication with said working chamber, said poppet disposed with respect to said working chamber so as to provide a throttling slot between said working chamber and said poppet chamber, biasing means for urging said hydraulic valve towards said closed position in which said poppet chamber is not in communication with said inlet port, a control valve disposed between said control chamber and said spill port, and a primary bypass channel for connecting said poppet chamber to said control chamber, whereby during at least a portion of the initial movement of said hydraulic valve from said closed position to said open position said primary bypass channel is closed and when said hydraulic valve reaches said at least one intermediate position said primary bypass channel is open.