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Cummins : Researchers Submit Patent Application, "Fuel Injection Pressure Pulsation Dampening System", for Approval (USPTO 20150219054)

08/20/2015 | 02:21pm US/Eastern

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Peavler, Paul (Columbus, IN); Benson, Donald J. (Columbus, IN); Free, Paul Douglas (Hope, IN); Huang, Jeffrey C. (Greenwood, IN); Benham, Eric (Columbus, IN); Morris, JR., C. Edward (Columbus, IN), filed on January 31, 2014, was made available online on August 13, 2015.

The patent's assignee is Cummins Inc.

News editors obtained the following quote from the background information supplied by the inventors: "A fuel injector's principal function is to control the flow of injection fuel through an injector cavity into and through one or more injector orifices into a combustion chamber of an internal combustion engine. Because the injection fuel flows at high pressure and high velocity, the start and stop of flow through the injector orifice(s) generates pressure waves or pulsations in the injector cavity. The pressure waves or pulsations in the injection fuel leads to undesirable variations in fuel flow through the injector orifice(s)."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In various embodiments of the disclosure, a fuel injector for injecting fuel at high pressure into a combustion chamber of an internal combustion engine includes an injector body including a longitudinal axis, a fuel delivery circuit, and an injector orifice to discharge fuel from the fuel delivery circuit into the combustion chamber. The fuel delivery circuit includes an injector cavity and a plurality of injection fuel delivery passages extending longitudinally in the injector body in fluid communication with the injector cavity to deliver injection fuel to the injector orifice. Each of the plurality of injection fuel delivery passages includes a passage cross sectional flow area. At least one and less than a total number of the plurality of injection fuel delivery passages includes an orifice having an orifice cross sectional flow area less than the passage cross sectional flow area and is sized to reduce propagation of pressure waves.

"In various embodiments, the injector body further includes an upper body portion, a lower body portion in which is positioned the injector cavity, and a cover plate positioned between the upper body portion and the lower body portion. The injection fuel delivery passages extend through the cover plate and at least one orifice being positioned in the cover plate.

"The cover plate may be attached to the lower body portion to form a valve assembly. The valve assembly may include a stator housing, and the cover plate places a load on the stator housing. The fuel injector may further include a contact spring positioned longitudinally between the cover plate and the stator housing to impart a spring load to the stator housing.

"The plurality of injection fuel delivery passages may be arranged in the cover plate in an arc segment, when viewed along the longitudinal axis, having a first end and a second end. There may be at least three to four injection fuel delivery passages. The number of orifices can range one to three, or the injection fuel delivery passage at the first end and the injection fuel delivery passage at the second end can each include one orifice.

"In various other embodiments, the injector body may further include an upper body portion, a lower body portion, and an injection control valve assembly. The injection control valve assembly includes a valve housing positioned along the longitudinal axis in compressive abutment between the upper body portion and the lower body portion to create a force load on the valve housing. The injection control valve assembly further includes a control valve member positioned in the valve housing to move between a first position and a second position. An actuator is positioned in the valve housing and adapted to cause movement of the control valve member between the first and the second positions. The actuator includes a stator housing positioned in the valve housing, and a stator positioned in the stator housing. The injection control valve assembly includes a contact spring positioned longitudinally between the stator housing and the upper body portion to impart a spring load to the stator housing and further includes a cover plate. The cover plate is positioned longitudinally between the upper body portion and the valve housing, and the contact spring is positioned longitudinally between the cover plate and the stator housing. The injection fuel delivery passages extend through the cover plate and at least one orifice being positioned in the cover plate.

"In various embodiments, the orifice cross sectional flow area is about 6.25% of the passage cross sectional flow area. Further, in various embodiments, the passage cross sectional flow area of each fuel delivery passage is about the same diameter. Yet further, in various embodiments, each orifice is a sharp-edged orifice.

"In some embodiments, the injector body may include a plurality of injector passage surfaces forming the plurality of injection fuel delivery passages. An orifice wall extends transversely and radially inward, and each orifice is formed in one orifice wall. Each orifice wall also includes an orifice surface extending perpendicular to the transverse orifice wall and forming the orifice, and the intersection of each transverse orifice wall and each orifice surface forms an upper edge and a lower edge. The upper edge and the lower edge may have a radius less than 0.002 inches.

"While multiple embodiments are disclosed, still other embodiments of the present disclosure will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the disclosure. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a cross-sectional view of a portion of an internal combustion engine including a fuel injector according to an exemplary embodiment of the present disclosure.

"FIG. 2 is a cross-sectional view of a portion of the internal combustion engine showing detail of the fuel injector of FIG. 1.

"FIG. 3 is a perspective partially exploded view of a control valve assembly and upper body portion of the fuel injector of FIG. 2.

"FIG. 4 is a perspective exploded view of the control valve assembly of the fuel injector of FIG. 2.

"FIG. 5 is a cross-sectional view of a cover plate of the control valve assembly of FIG. 4 along the line 5-5.

"FIG. 6 is a graph showing a comparison between injection rate shape and injection body pressure versus time achieved using a fuel injector according to various embodiments of the present disclosure and a conventional fuel injector.

"FIG. 7 is a graph showing a comparison between injected quantity error versus hydraulic separation time achieved using a fuel injector according to various embodiments of the present disclosure and a conventional fuel injector.

"While the disclosure is amenable to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and are described in detail below. The intention, however, is not to limit the disclosure to the particular embodiments described. On the contrary, the disclosure is intended to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure as defined by the appended claims."

For additional information on this patent application, see: Peavler, Paul; Benson, Donald J.; Free, Paul Douglas; Huang, Jeffrey C.; Benham, Eric; Morris, JR., C. Edward. Fuel Injection Pressure Pulsation Dampening System. Filed January 31, 2014 and posted August 13, 2015. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4329&p=87&f=G&l=50&d=PG01&S1=20150806.PD.&OS=PD/20150806&RS=PD/20150806

Keywords for this news article include: Cummins Inc.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2015, NewsRx LLC

(c) 2015 NewsRx LLC, source Government & Education Newsletters

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