Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2002-07-29
2004-04-27
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S300000, C123S305000
Reexamination Certificate
active
06725838
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to nozzle assemblies, and more particularly to fuel injectors having dual mode capabilities.
BACKGROUND ART
In an effort to reduce emissions and to comply with more strict clean air standards, manufacturers of various diesel engine components have begun exploring alternative engine strategies. One such strategy that appears to have promise is the alteration of the manner in which fuel is injected. For instance, in a traditional diesel engine, fuel injection is timed to occur when the cylinder piston is near a top dead center position for its compression stroke. When the fuel and air reach an auto-ignition point, combustion occurs. This can be virtually instantaneous or after some ignition delay.
Engineers have learned that it is possible to reduce engine emissions if a small amount of fuel is injected while the cylinder piston is at the beginning of the compression stroke. In other words, when the piston is closer to a bottom dead center position than the top dead center position for the compression stroke. The injected fuel mixes with the air as it is being compressed to form a relatively homogeneous mixture that combusts when the piston is near its top dead center position. This mode of operation is typically referred to as homogeneous charge compression ignition. Because the fuel mixture is relatively homogeneous when combustion occurs, fewer emissions are produced during this type of injection event than a typical injection event. In other words, uniform air/fuel distribution and associated lower combustion temperatures contribute to significant NO
x
, and particulate reductions.
One example of an engine utilizing the homogeneous charge compression ignition is described in U.S. Pat. No. 5,875,743, which issued to Dickey on Mar. 2, 1999 and is entitled Apparatus and Method For Reducing Emissions in a Dual Combustion Mode Diesel Engine. The apparatus disclosed by Dickey includes a port diesel fuel injector that is capable of delivering fuel to an engine cylinder for a homogeneous charge compression ignition injection event in addition to a fuel injector positioned to perform a more traditional injection event. While the fuel injection system of Dickey is capable of reducing emissions, there is still room for improvement.
For instance, engineers have determined that a reduction in the number of engine components can result in a more robust operating system. As indicated, the fuel injection system taught by Dickey includes multiple fuel injectors for the performance of two distinct injection events. However, it should be appreciated that the fuel injection system could be more robust if there was only a single fuel injector which had a limited number of components. In other words, a reduction in the number of fuel injectors, and/or fuel injector components, could make the system more robust because there would be less components that could fail or malfunction. In addition, in contradiction to the teachings of Dickey, engineers have learned that for certain engine load conditions, homogeneous charge compression ignition events may not be desirable.
The present invention is directed to overcoming one or more of the problems set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, a nozzle assembly includes a nozzle body that has a centerline and defines a plurality of nozzle outlets. A first portion of the plurality of nozzle outlets are oriented at a first angle with respect to the centerline. A second portion of the plurality of nozzle outlets are oriented at a second angle with respect to the centerline. A needle valve is positioned adjacent the plurality of nozzle outlets.
In another aspect of the present invention, an engine that has at least two modes of operation includes an engine housing defining a plurality of cylinders. A solitary fuel injector is provided for each of the cylinders and each has a tip at least partially positioned in one of the plurality of cylinders. The fuel injector has a first configuration for a homogeneous charge compression ignition mode of operation. The fuel injector has a second configuration for a conventional mode of operation.
REFERENCES:
patent: 2898051 (1959-08-01), Teichert
patent: 3425635 (1969-02-01), Guertler
patent: 3633823 (1972-01-01), Steiger
patent: 3640466 (1972-02-01), Steiger
patent: 4006859 (1977-02-01), Thoma
patent: 4156560 (1979-05-01), Cheklich et al.
patent: 4200231 (1980-04-01), Knape
patent: 4202500 (1980-05-01), Keiczek
patent: 4269360 (1981-05-01), Kopse
patent: 4284043 (1981-08-01), Happel
patent: 4448168 (1984-05-01), Komada et al.
patent: 4546739 (1985-10-01), Nakajima et al.
patent: 4595144 (1986-06-01), Wiegand et al.
patent: 4628881 (1986-12-01), Beck et al.
patent: 4758169 (1988-07-01), Steiger
patent: 4790270 (1988-12-01), McKay et al.
patent: 4796577 (1989-01-01), Baranescu
patent: 4856713 (1989-08-01), Burnett
patent: 4958605 (1990-09-01), O'Neal et al.
patent: 4984738 (1991-01-01), Winquist
patent: 4987887 (1991-01-01), Kelly
patent: 5058549 (1991-10-01), Hashimoto et al.
patent: 5078107 (1992-01-01), Morikawa
patent: 5086737 (1992-02-01), Watanabe et al.
patent: 5163621 (1992-11-01), Kato et al.
patent: 5211340 (1993-05-01), Yoshizu
patent: 5241935 (1993-09-01), Beck et al.
patent: 5315973 (1994-05-01), Hill et al.
patent: 5458292 (1995-10-01), Hapeman
patent: 5497743 (1996-03-01), Clarke
patent: 5647316 (1997-07-01), Hellén et al.
patent: 5669355 (1997-09-01), Gibson et al.
patent: 5709194 (1998-01-01), Moncelle
patent: 5740775 (1998-04-01), Suzuki et al.
patent: 5769060 (1998-06-01), Matsumoto
patent: 5775289 (1998-07-01), Yoshida et al.
patent: 5875743 (1999-03-01), Dickey
patent: 5899389 (1999-05-01), Pataki et al.
patent: 5996558 (1999-12-01), Ouellette et al.
patent: 6019091 (2000-02-01), Spoolstra
patent: 6119960 (2000-09-01), Graves
patent: 6220528 (2001-04-01), Cooke et al.
patent: 6279840 (2001-08-01), Buckley
patent: 6298822 (2001-10-01), Radue
patent: 6338445 (2002-01-01), Lambert et al.
patent: 6340121 (2002-01-01), Lambert
patent: 6378503 (2002-04-01), Lambert
patent: 6422199 (2002-07-01), Buckley et al.
patent: 3824467 (1990-01-01), None
patent: 3824467 (1990-01-01), None
patent: 0 470 348 (1992-02-01), None
patent: 1 041 272 (2000-03-01), None
patent: 1069308 (2001-01-01), None
patent: 11280609 (1999-10-01), None
patent: 2000303936 (2000-10-01), None
patent: WO 98/07973 (1998-02-01), None
patent: WO 98/10179 (1998-03-01), None
patent: WO 99/42718 (1999-08-01), None
DW Gill, G Heimel, and P Herzog; AVariable Nozzle Concept for High-Speed DI Diesel Engines; pp. 163-181; Place, Title and Date of Publication unknown.
Quentin A. Baker; Expanding Diesel Engine Cetane Limits Through Staged Injection; 1983; pp. 1-15; SAE 830246; Society of Automotive Engineers, inc., USA.
Rudolph H. Stanglmaier and Charles E. Roberts; Homogeneous Charge Compression Ignition (HCCI): Benefits, Compromises, and Future Engine Applications; SAE 1999-01-3682; 1999 Society of Automotive Engineers, Inc., pp. 1-8, USA.
Angelino Joseph
Cotton Clifford
Dieffenbach Robert
Holtman Richard
Shafer Scott
Caterpillar Inc
Liell & McNeil
Miller Carl S.
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