Abstract: An engine has an injector communicating with a combustion chamber to introduce a plurality of dosing shots to mix with exhaust gases and regenerate an aftertreatment device downstream of the combustion chamber. An apportionment strategy can apportion a per cylinder quantity, representing the quantity of dosing fuel to introduce per cylinder per combustion cycle, among a predefined number of dosing shots each having a first per shot quantity. The strategy compares the predefined number of dosing shots with a temporal dosing window to determine if predefined number of dosing shots can be conducted within the temporal dosing window. If so, the strategy proceeds to introduce the predefined number of dosing shots and if not, the strategy may recalculate a reduced number of dosing shots and reapportions a second per shot quantity.

Abstract: A fluid conditioning system includes a first filter mount having a first filter inlet port and a first filter outlet port, a first motor, a first pump operatively coupled to the first motor, a second filter mount having a second filter inlet port, a second pump, and a controller operatively coupled to the first motor. The controller is configured to operate the first pump at a flowrate that is higher than a flowrate of the second pump. An outlet of the first pump is fluidly coupled to the first filter inlet port via a first filter inlet conduit, and an inlet of the first pump is fluidly coupled the first filter outlet port via a first filter outlet conduit. An inlet of the second pump is fluidly coupled to the first filter outlet port via the first filter outlet conduit.

Abstract: An engine has an injector communicating with a combustion chamber to introduce a plurality of dosing shots to mix with exhaust gases and regenerate an aftertreatment device downstream of the combustion chamber. An apportionment strategy can apportion a per cylinder quantity, representing the quantity of dosing fuel to introduce per cylinder per combustion cycle, among a predefined number of dosing shots each having a first per shot quantity. The strategy compares the predefined number of dosing shots with a temporal dosing window to determine if predefined number of dosing shots can be conducted within the temporal dosing window. If so, the strategy proceeds to introduce the predefined number of dosing shots and if not, the strategy may recalculate a reduced number of dosing shots and reapportions a second per shot quantity.

Abstract: A fluid conditioning system includes a first filter mount having a first filter inlet port and a first filter outlet port; a motor unit; a recirculation pump unit operatively coupled to the motor unit, an outlet of the recirculation pump unit being fluidly coupled to the first filter inlet port via a first filter inlet conduit, an inlet of the recirculation pump unit being fluidly coupled to the first filter outlet port via a first filter outlet conduit; a second filter mount having a second filter inlet port; and a delivery pump unit operatively coupled to the motor unit. The inlet of the delivery pump unit is fluidly coupled to the first filter outlet port via the first filter outlet conduit, and the outlet of the delivery pump unit is fluidly coupled to the second filter inlet port via a second filter inlet conduit.

Abstract: A fluid conditioning system includes a first filter mount having a first filter inlet port and a first filter outlet port, a first motor, a first pump operatively coupled to the first motor, a second filter mount having a second filter inlet port, a second pump, and a controller operatively coupled to the first motor. The controller is configured to operate the first pump at a flowrate that is higher than a flowrate of the second pump. An outlet of the first pump is fluidly coupled to the first filter inlet port via a first filter inlet conduit, and an inlet of the first pump is fluidly coupled the first filter outlet port via a first filter outlet conduit. An inlet of the second pump is fluidly coupled to the first filter outlet port via the first filter outlet conduit.

Abstract: A fuel filtration system is provided. The fuel filtration system includes a pump configured to receive a flow of fuel from a fuel storage tank and at least one filter positioned downstream to the fuel filtration system and fluidly coupled to the pump. The fuel filtration system further comprises a recirculation loop configured to recirculate at least a portion of the fuel through the at least one filter. The recirculation loop is also configured to provide a remaining portion of the fuel to an engine during the recirculation. The remaining portion of the fuel is determined based on a fuel consumption of the engine.

Abstract: A fuel system for providing fuel to an engine and to a regeneration system associated with the engine, including a fuel source, and a pump associated with the fuel source, the pump operable in a first state to pump fuel from the fuel source to the engine, and the pump operable in a second state to pump fuel from the fuel source to the regeneration system, wherein the first state corresponds to a first rotational direction of the pump and the second state corresponds to a second rotational direction of the pump. In one embodiment, the pump is an electric fuel pump.

Abstract: The pump described herein provides a potentially lower cost alternative to conventional high-pressure pumps by providing a head, a plunger, and a control valve assembly. The head defines a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having a third diameter. The plunger is configured to reciprocate within the plunger bore. The plunger, the plunger bore, and the intermediate chamber at least partially define a pumping chamber. The control valve assembly is coupled to the head and includes an actuator moveable in response to an input signal and a valve element coupled to the actuator. The valve element is received within the valve bore and moveable between an open and a closed position. The valve element includes a body having a fourth diameter and a valve head having a fifth diameter. The first diameter is no larger than the second diameter.

Abstract: Reducing leakage within fuel injectors is one way in which the efficiency of the overall fuel injection system can be improved. In most fuel injectors that include a direct control needle valve, the needle valve member is still biased toward a closed position by a spring that is located in a spring chamber connected to a low pressure vent. In many instances, the needle valve member is guided in a tight clearance region adjacent the spring chamber. Since the internal plumbing of the fuel injector is connected to a high pressure rail during and between injection events, static leakage across the guide region of the needle valve member can reduce efficiency. Static leakage is reduced in the present invention by connecting the spring chamber to the common rail instead of to a low pressure vent.

Abstract: Reducing leakage within fuel injectors is one way in which the efficiency of the overall fuel injection system can be improved. In most fuel injectors that include a direct control needle valve, the needle valve member is still biased toward a closed position by a spring that is located in a spring chamber connected to a low pressure vent. In many instances, the needle valve member is guided in a tight clearance region adjacent the spring chamber. Since the internal plumbing of the fuel injector is connected to a high pressure rail during and between injection events, static leakage across the guide region of the needle valve member can reduce efficiency. Static leakage is reduced in the present invention by connecting the spring chamber to the common rail instead of to a low pressure vent.

Abstract: An actuation fluid control valve for a hydraulically actuated fuel injector has a valve body having an inlet seat, a bore having a bore axis and a bore wall, an actuation control cavity, a low pressure actuation fluid drain, an actuation fluid inlet for admitting high pressure actuation fluid to the bore from outside the fuel injector, an inlet seat at a border between the actuation control cavity and the bore, and a drain seat at a border between the actuation control cavity and the actuation fluid drain. An actuator is attached with the valve body.

Abstract: A pilot actuated spool valve assembly includes a valve body that defines a first passage, a second passage and a flow passage. A unitary pilot body is at least partially positioned in the valve body and has a first valve seat and a second valve seat. A pilot member is moveable in the pilot body between an up position in which the pilot member closes the first valve seat and a down position in which the pilot member closes the second valve seat. A spool valve member has a control hydraulic surface and is positioned in the valve body. It is moveable between a first position in which the first passage is open to the flow passage, and a second position in which the second passage is open to the flow passage. At least one of the valve body, the pilot body, the pilot member and the spool valve member define a control volume fluidly connected to the first passage when the pilot member is in one of its up position and its down position.

Abstract: A hydraulically actuated fuel injector comprises a valve body and a stepped valve member. The valve body has a wide bore portion and a narrow bore portion. The stepped valve member has a wide member section and a narrow member section. The wide member section is slidably disposed in the wide bore portion and defines a first diametrical clearance therebetween. The narrow member section and the wide bore portion define a damping chamber therebetween that is wider than the first diametrical clearance. The stepped valve member is slidable between a first position at which the damping chamber is substantially fluidly open to a low pressure hydraulic fluid reservoir, and a second position at which a fractional portion of the narrow member section is slidably disposed within a portion of the narrow bore portion defining a second diametrical clearance therebetween that is less wide than the damping chamber and substantially restricts fluid communication between the damping chamber and the reservoir.

Abstract: An injector body defines a fuel pressurization chamber, a spill passage, a stop volume and a nozzle outlet. Positioned within the injector body is a plunger which is movable between a retracted position and an advanced position. The plunger opens the spill passage to the fuel pressurization chamber over a portion of the distance between the retracted and advanced positions. The injector body also contains a needle valve member which includes a closing hydraulic surface that is exposed to fluid pressure in the stop volume. The stop volume is pressure coupled to the spill passage.

Abstract: A hydraulically-actuated fuel injector includes an injector body that defines an actuation fluid inlet that is open to a first actuation fluid cavity, and a second actuation fluid cavity that is connected to the first actuation fluid cavity via a connection passage. The injector body also defines at least one actuation fluid drain. A source of relatively high pressure actuation fluid is connected to the actuation fluid inlet. A relatively low pressure reservoir is connected to the at least one actuation fluid drain. A control valve is attached to the injector body and is moveable between a first position in which the second actuation fluid cavity is open to the first actuation fluid cavity, and a second position in which the second actuation fluid cavity is open to the at least one actuation fluid drain.

Abstract: A hydraulically-actuated fuel injector includes an injector body having a nozzle chamber that opens to a nozzle outlet and a plunger bore, and further has a prime spill port and an idle stability port that open to the plunger bore. A hydraulic means for pressurizing fuel in the nozzle chamber includes a plunger mounted to reciprocate in the plunger bore between a retracted position and an advanced position. A portion of the plunger bore and plunger define a fuel pressurization chamber. A needle valve member is mounted to reciprocate in the nozzle chamber between an open position in which the nozzle outlet is open and a closed position in which the nozzle outlet is closed. A portion of the plunger blocks the prime spill port when the plunger is in its retracted position. A different portion of the plunger blocks the idle stability port when the plunger is in its retracted position.

Abstract: A control valve, preferably for use in a fuel injector, includes a valve body that defines a first passage and a second passage. A solenoid is attached to the valve body and has an armature. A multi piece valve member is attached to the armature and is positioned in the valve body. The multi piece valve member is moveable between a first position in which the first passage is open to the second passage, and a second position in which the first passage is closed to the second passage. The multi piece valve member includes a second valve member piece moveable with respect to a first valve member piece between a contact position in which a portion of the second valve member piece is in contact with the first valve member piece, and a separated position in which the portion is a distance away from the first valve member piece. A damping spring is compressed between the second valve member piece and the first valve member piece when the second valve member piece is in its separated position.