Patent ID: 6520150
Filing Date: 2003-02-18
Classification: F02M

Abstract:
A fuel injector assembly, comprising:a fuel injector housing comprising a plunger cavity and a first fuel chamber; a pressurization control valve assembly structured and arranged for electrical connection to an electronic control module and comprising a second fuel chamber, in fluidic communication with said first fuel chamber, and further comprising a first valve member, said first valve member being operable to open and close fuel flow between said first fuel chamber and said second fuel chamber in response to electronic control module signals; a spill circuit conduit; a control rod housing comprising a first pressure chamber in fluidic communication with said plunger cavity, and a control rod cavity; a timing control valve assembly structured and arranged for electrical connection to an electronic control module and comprising a second valve member, said spill circuit conduit being in fluidic communication with said timing control valve assembly; a first fuel conduit extending between said first pressure chamber and said timing control valve assembly, said third valve member being operable to open and close fuel flow between said first fuel conduit and said spill circuit conduit in response to electronic control module signals; a needle assembly housing comprising a second pressure chamber, a needle cavity and a fuel outlet, said needle cavity comprising a first segment adjacent said control rod cavity and a second segment in fluidic communication with said fuel outlet and said second pressure chamber; a second fuel conduit extending between said plunger cavity and said second pressure chamber; a plunger extending into said plunger cavity and structured and arranged for reciprocating movement within said plunger cavity; an actuator associated with said plunger and structured and arranged for reciprocating said plunger in said plunger cavity; a control rod extending into said control rod cavity and having a control rod segment, extending into said first segment of said needle cavity, and a control rod surface exposed to said first pressure chamber, said control rod structured and arranged for reciprocating movement within said control rod cavity; a needle having a first end extending into said first segment of said needle cavity, said first end including a first abutment surface engaging said control rod segment, and an opposite second end extending into said second segment of said needle cavity, said second end comprising a needle portion exposed to said second pressure chamber, said needle structured and arranged for reciprocating movement within said needle cavity to open and close said fuel outlet; a third fuel conduit extending between said plunger cavity and said first fuel chamber; a fourth fuel conduit extending between said second fuel chamber and a fuel supply conduit; and a fifth fuel conduit extending between said first fuel chamber and said spill circuit conduit, said second valve member being operable to open and close fuel flow between said first fuel chamber and said spill circuit, when said first valve member is closed and opened, respectively.