Fuel injector

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the intensifier pressure chamber having a fuel inlet port and being in direct fluid communication with a surface during the injection of fuel, a certain pressure bearing on the surface acting to open the needle valve, the fuel injector comprising:

• a spill port intersecting the cylinder wall, the spill port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired such that no fuel injection occurs while the spill port is open.

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the intensifier pressure chamber having a fuel inlet port and being in direct fluid communication with a surface during the injection of fuel, a certain pressure bearing on the surface acting to open the needle valve, the fuel injector comprising:

• a control valve having a spool shiftable between a first position and a second position, defining a round trip of the valve spool, the round trip being translating motion between the first position and the second position and a returning translating motion to the first position,
• a spill port intersecting the cylinder wall, the spill port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired such that no fuel injection occurs until the spill port is closed by the intensifier plunger.

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber and being in direct fluid communication with a surface during an injection of fuel, a certain pressure bearing on the surface acting to open an injector needle valve to effect the fuel injection, the intensifier pressure chamber having a fuel inlet port, the fuel injector comprising:

• a first control port, the control port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired to control the opening motion of the injector needle valve such that no fuel injection occurs when the control port is open.

A fuel injector having an intensifier plunger and a needle valve, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the needle valve being translatable between an open position and a closed position, a fuel injection orifice being open in the needle valve open disposition, the needle valve having a needle back surface, the needle back surface defining in part a needle back chamber, the fuel injector comprising:

• a control port including a control port passageway being fluidly couplable to the needle back surface.

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the fuel injector comprising:

• a first control port, the first control port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired to control the opening motion of an injector needle valve;
• and
• a second control port, the second control port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired to control the opening motion of the injector needle valve.

A fuel injector for generating a fuel injection event in the combustion chamber of an internal combustion engine, having a controller being shiftable from a first disposition toward a second disposition and returnably shiftable to the first disposition, such shifting acting to port an actuating fluid to stroke an intensifier plunger for compressing fuel in an intensifier pressure chamber, the pressure chamber being in direct fluid communication with a surface during an injection of fuel, a certain pressure bearing on the surface acting to open an injector needle valve to effect the fuel injection, the intensifier pressure chamber having a fuel inlet port, comprising:

• a spill passageway operably disposed in fluid communication with the intensifier pressure chamber, the spill passageway spilling fuel from the pressure chamber for a select duration of time after initiation of the intensifier plunger compressive stroke motion, the spill passageway effecting a selected hydraulic delay between the initiation of an actuation command to the controller and the commencement of fuel injection the spill passageway having a spill port opening into the intensifier pressure chamber, the spill port being open when the intensifier plunger is in a first retracted position.

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the pressure chamber being in direct fluid communication with a surface during an injection of fuel, a certain pressure bearing on the surface acting to open an injector needle valve to effect the fuel injection, the intensifier pressure chamber having a fuel inlet port, the fuel injector comprising:

• a spill port intersecting the cylinder wall, the spill port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired, the intensifier plunger acting cooperatively with the spill port to delay the beginning of fuel injection with respect to initiation of intensifier plunger valve motion.

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the pressure chamber being in direct fluid communication with a surface during an injection of fuel, a certain pressure bearing on the surface acting to open an injector needle valve to effect the fuel injection, the intensifier pressure chamber having a fuel inlet port, the fuel injector comprising:

• a spill port intersecting the cylinder wall, the spill port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired, the intensifier plunger acting cooperatively with the spill port to delay the beginning of fuel injection with respect to initiation of actuation of an injector control valve.

A fuel injector having an intensifier plunger, the intensifier plunger being translatable in a cylinder between a retracted position and a full stroke position, the cylinder being defined by a cylinder wall, the cylinder wall defining in part a variable volume intensifier pressure chamber, the pressure chamber being in direct fluid communication with a surface during an injection of fuel, a certain pressure bearing on the surface acting to open an injector needle valve to effect the fuel injection, the intensifier pressure chamber having a fuel inlet port, the fuel injector comprising:

• a spill port intersecting the cylinder wall, the spill port being variably openable and closeable by the intensifier plunger during the translating motion of the intensifier piston for spilling fuel from the variable volume intensifier pressure chamber as desired, the intensifier plunger acting cooperatively with the spill port to delay the beginning of fuel injection with respect to initiation of actuation of an injector control valve.