Gm Global Technolgoy Operations, Inc.

Delphi Technologies, Inc.

Brent J Wahba

Charles Wilson Braun

Ahmet T Becene

Kevin Richard Keegan

Ronald John Krefta

Gary John Deangelis

Harrie William Bonnah, Ii

Michael Raymond Raney

Michael Schneider

Kern E Haynes

Steven J Fogarassy

Paul B Rissi

Steven M Curran

Philippe S Farah

Christopher A Tucker

Leonard Lee Shebert, Jr

George A Kotkowicz

David J Thompson, Jr

Eugene A Kobos

James M Banna

Michael Brian Lavan

A system and method for controlling an injection time of a fuel injector. The system includes a drive circuit configured to output a drive signal having a pulse width, wherein the injection time is influenced by the pulse width and a closing electrical decay of the fuel injector. A controller is configured to determine the closing electrical decay of the fuel injector and adapt the pulse width based on the closing electrical decay to control the injection time. The closing electrical decay includes a closing response. The controller determines the closing response based on an injector signal, such as a coil voltage of the fuel injector. By determining the closing response, the pulse width can be adjusted to compensate for fuel injector part-to-part variability, fuel injector wear, variations in fuel pressure received by the fuel injector, dirt in the fuel injector, and the like.

System and method for controlling an injection time of a fuel injector based on closing electrical decay

The present invention generally includes a composite fuel rail with integral damping provided by flat sections, molded into the rail conduit, that flex in response to a pressure pulsation and a co-injected composite laminate structure wherein the compounds of the laminates can be selectively varied to provide impact resistance, chemical resistance and a vapor permeation barrier, as needed.

Composite fuel rail with integral damping and a co-injected non-permeation layer

An engine fuel injector includes an internal fuel passage in which pressure waves can develop upon opening and closing of an injection valve. A fuel pressure damper is associated with the fuel passage and operates to vary the internal volume of the fuel passage in a manner to reduce the amplitude of pressure variations and pressure waves in the fuel passage. A variety of fuel pressure damper embodiments are disclosed.

Fuel injector with integral damper

A fuel injector includes a tubular injector body which has an open, upper end and defines an axial fuel passage. A solenoid actuator assembly is disposed in the injector body and includes a spool-like bobbin with a central through-bore and a wound wire coil supported thereon. A magnetic circuit pole subassembly includes a fuel tube, a valve guide, and a pole piece. The fuel tube has a tubular portion and a lower circular flange portion radially extending from a lower terminal end of the tubular portion to contact the open, upper end of the injector body. The nonmagnetic valve guide has a guide cylindrical portion, extending axially downward through the central throughbore and is closely encircled by the bobbin, and a guide circular flange portion radially extending from an upper end of the guide cylindrical portion and mating with the lower circular flange portion of the fuel tube. The pole piece is configured as a constant section cylinder to be received by the fuel tube tubular portion and the guide cylindrical portion. A valve armature is disposed within the injector body downstream of the pole piece where upon energization of the solenoid actuator assembly, the injector body, fuel tube, pole piece, and armature conduct a magnetic circuit to axially draw the valve armature permitting fuel injection.

Fuel Injector

A fuel injector for discharging fuel to an internal combustion engine is disclosed. The injector has a nozzle body with an annular valve seat surrounding a fuel discharge opening. A valve member is disposed in the internal cylindrical cavity and is moveable between a first, sealing position relative to the valve seat and a second, open position off of the seat. The valve member is guided in its movement, with respect to the valve seat by a valve guide member disposed in the nozzle, closely adjacent the annular valve seat. The valve guide member includes a disc shaped member having an outer perimeter which is configured for placement within the nozzle body and a tubular central portion which defines a central, valve guide opening. The valve guide opening extends through the tubular central portion to open adjacent the annular valve seat and is configured for circumjacent disposition relative to the valve member to guide movement of the valve. Fuel openings extend through the valve guide and are disposed circumferentially about the valve guiding central opening to conduct fuel around the valve guide member.

Fuel injector deep drawn valve guide

An electromagnetic fuel injector is disclosed having an orificed fuel injector plate, mounted downstream of a solenoid actuated valve and an associated main orifice passage opened and closed by the valve, to receive fuel when the valve is moved to an open position from an associated valve seat for controlling and directing fuel flow from the injector. The director plate is provided with a plurality of injection orifices to direct fuel streams towards the valve head of an engine intake poppet valve while avoiding targeting the valve stem to thereby reduce the incidence of fuel reflection from the valve stem and associated intake surface wetting.

Fuel injector

An electromagnetic fuel injector for delivering fuel to an internal combustion engine having a solenoid energizeable by an electrical signal from a controller to establish a magnetic field operable to lift a valve member from a seat. The solenoid assembly having a tubular pole piece with an area of increased reluctance adjacent the working surface of the pole piece and an adjustment rod disposed for movement within the high reluctance region to thereby vary the location at which the high reluctance region begins. Leakage flux from the high reluctance region of the magnetic circuit may be directed to operate on a particular element of the magnetic circuit based on the location of the adjustment rod thereby allowing the leakage flux to exert a force on the element to thereby vary the dynamic response characteristics of the injector.

Fuel injector calibration through directed leakage flux

An electromagnetic actuator having an integral capacitor and secondary coil for reducing opening and closing response times without the need for switching circuits. The secondary coil produces a magnetic field during energization which aids the primary coil in opening the actuator. A capacitor progressively reduces the current flow through the secondary coil as it charges up. During deenergization, the capacitor discharges through the secondary coil, producing a magnetic field which opposes the primary coil's residual magnetic field and aids the closing of the actuator.

Rapid response dual coil electromagnetic actuator with capacitor

An electromagnetic fuel injector and novel method for assembly and calibration having a solenoid assembly with a pole piece, a valve assembly including an armature, and a working air gap separating the valve assembly from the pole piece when the injector is in a de-energized state. A shim having a thickness equivalent to the length of the working air gap is placed between the pole piece and the valve member during construction of the injector. Following assembly, a solvent is introduced into the injector to dissolve the shim, which is constructed of a material readily dissolvable in the desired solvent, to define the working air gap and, therefore, the static flow through the injector.

Fuel injector stroke calibration through dissolving shim

An electromagnetic actuator having an integral calibration mechanism for easy adjustment of armature response times. An additional (secondary) coil is incorporated into the device for providing a magnetic field opposing the magnetic field produced by the actuator's primary coil. A variable resistive element, used in conjunction with the secondary coil, provides a means for adjusting the current flow through the secondary coil and thereby the strength of the resultant magnetic field experienced by the armature. Since an is armature's response is proportional to the strength of the magnetic field to which it is subjected, this invention provides a means of calibrating the armature response times of an actuator. The availability of establishing a uniform, desired response results in improved multiple actuator system functionality and more reliable actuator interchangeability.

Electromagnetic actuator with response time calibration

In an injector adapted to deliver a charge of fuel and air directly into the combustion chamber of a two-stroke cycle engine, a pair of solenoid coils are aligned along a common axis between an armature that serves as a fuel metering valve and an armature that operates a charge delivery valve.

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Honeoye Falls, NY, United States of America

Brent J Wahba