Patents by Inventor Dianqi Fang
Dianqi Fang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11098685Abstract: A fuel injector assembly includes a fuel injector and an annular filter coupled with the fuel injector, the annular filter being snap-fitted with one of a nozzle case or an injector body of the fuel injector and slip-fitted with the other of the nozzle case or the injector body. The annular filter has a perforated wall forming a filtration screen covering an actuation fluid inlet formed in the nozzle case and positioned upstream of the actuation fluid inlet to trap particulates in incoming actuation fluid.Type: GrantFiled: February 19, 2019Date of Patent: August 24, 2021Assignee: Caterpillar Inc.Inventors: Dianqi Fang, Daniel Bumpus, Diego Caceres, David Martin, Sudhindra Ayanji
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Publication number: 20200263648Abstract: A fuel injector assembly includes a fuel injector and an annular filter coupled with the fuel injector, the annular filter being snap-fitted with one of a nozzle case or an injector body of the fuel injector and slip-fitted with the other of the nozzle case or the injector body. The annular filter has a perforated wall forming a filtration screen covering an actuation fluid inlet formed in the nozzle case and positioned upstream of the actuation fluid inlet to trap particulates in incoming actuation fluid.Type: ApplicationFiled: February 19, 2019Publication date: August 20, 2020Applicant: Caterpillar Inc.Inventors: Dianqi Fang, Daniel Bumpus, Diego Caceres, David Martin, Sudhindra Ayanji
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Patent number: 9879645Abstract: A fuel injector control valve assembly is provided that comprises a valve actuating mechanism, a cage member that is operatively connected to the valve actuating mechanism, a poppet valve member that is operatively connected to the cage member and that defines a perimeter and a longitudinal axis, a valve sleeve member that is disposed about the poppet valve member, a shim that includes an upper surface that at least partially makes uninterrupted contact with the cage member and a lower surface that at least partially makes uninterrupted contact with the sleeve member, thereby providing a fluid seal about the perimeter of the poppet valve member, and a bounce limiting mechanism that is adjacent the shim and that is interposed between the cage member and at least one of either the poppet valve member and the valve sleeve member.Type: GrantFiled: February 18, 2016Date of Patent: January 30, 2018Assignee: Caterpillar Inc.Inventors: Norman D. Knapp, David E. Martin, Dianqi Fang
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Publication number: 20180019577Abstract: A remanufactured sparkplug includes a housing, an insulator within the housing, and first and second electrodes. The first electrode and the second electrode form a plurality of spark gaps at a plurality of new spark gap locations, and a plurality of spark-induced erosions are formed in the second electrode at a plurality of former spark gap locations that are circumferentially offset from the new spark gap locations.Type: ApplicationFiled: July 15, 2016Publication date: January 18, 2018Applicant: Caterpillar Inc.Inventors: Michael Gerstner, Timothy Graham, Dianqi Fang
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Patent number: 9859688Abstract: A remanufactured sparkplug includes a housing, an insulator within the housing, and first and second electrodes. The first electrode and the second electrode form a plurality of spark gaps at a plurality of new spark gap locations, and a plurality of spark-induced erosions are formed in the second electrode at a plurality of former spark gap locations that are circumferentially offset from the new spark gap locations.Type: GrantFiled: July 15, 2016Date of Patent: January 2, 2018Assignee: Caterpillar Inc.Inventors: Michael Gerstner, Timothy Graham, Dianqi Fang
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Publication number: 20170241392Abstract: A fuel injector control valve assembly is provided that comprises a valve actuating mechanism, a cage member that is operatively connected to the valve actuating mechanism, a poppet valve member that is operatively connected to the cage member and that defines a perimeter and a longitudinal axis, a valve sleeve member that is disposed about the poppet valve member, a shim that includes an upper surface that at least partially makes uninterrupted contact with the cage member and a lower surface that at least partially makes uninterrupted contact with the sleeve member, thereby providing a fluid seal about the perimeter of the poppet valve member, and a bounce limiting mechanism that is adjacent the shim and that is interposed between the cage member and at least one of either the poppet valve member and the valve sleeve member.Type: ApplicationFiled: February 18, 2016Publication date: August 24, 2017Applicant: Caterpillar Inc.Inventors: Norman D. Knapp, David E. Martin, Dianqi Fang
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Patent number: 9279391Abstract: A dual fuel system for an internal combustion engine includes a gaseous fuel subsystem and a liquid fuel subsystem. A plurality of fuel injectors each define a gaseous fuel passage fluidly connected to a gaseous fuel manifold of the gaseous fuel subsystem, a liquid fuel passage fluidly connected to a liquid fuel manifold of the liquid fuel subsystem, and a liquid fuel leak path from the liquid fuel passage to the gaseous fuel passage. A liquid fuel purging mechanism includes a drain conduit and at least one valve positioned fluidly between the drain conduit and the gaseous fuel manifold, and being adjustable to fluidly connect the drain conduit to the gaseous fuel manifold, to drain leaked liquid fuel to a low pressure outlet.Type: GrantFiled: April 23, 2013Date of Patent: March 8, 2016Assignee: Caterpillar Inc.Inventors: Dianqi Fang, Daniel Puckett
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Patent number: 9228507Abstract: A dual fuel common rail system may be operated in a regular mode in which a relatively large charge of gaseous fuel is ignited by compression igniting a relatively small injection quantity of liquid diesel fuel. The dual fuel system may be operated in a single fuel limp home mode in which liquid diesel fuel is injected at higher pressures. Over pressurization of the gaseous fuel side of the fuel system due to leaked liquid fuel is avoided by regularly injecting leaked liquid fuel, but not gaseous fuel, from the gaseous nozzle outlet set during the limp home mode of operation.Type: GrantFiled: January 2, 2013Date of Patent: January 5, 2016Assignee: Caterpillar Inc.Inventors: Cory A. Brown, Joshua W. Steffen, Dana R. Coldren, Alan R. Stockner, Hoisan Kim, Dianqi Fang
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Publication number: 20140311451Abstract: A dual fuel system for an internal combustion engine includes a gaseous fuel subsystem and a liquid fuel subsystem. A plurality of fuel injectors each define a gaseous fuel passage fluidly connected to a gaseous fuel manifold of the gaseous fuel subsystem, a liquid fuel passage fluidly connected to a liquid fuel manifold of the liquid fuel subsystem, and a liquid fuel leak path from the liquid fuel passage to the gaseous fuel passage. A liquid fuel purging mechanism includes a drain conduit and at least one valve positioned fluidly between the drain conduit and the gaseous fuel manifold, and being adjustable to fluidly connect the drain conduit to the gaseous fuel manifold, to drain leaked liquid fuel to a low pressure outlet.Type: ApplicationFiled: April 23, 2013Publication date: October 23, 2014Applicant: Caterpillar Inc.Inventors: Dianqi Fang, Daniel Puckett
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Publication number: 20140182552Abstract: A dual fuel common rail system may be operated in a regular mode in which a relatively large charge of gaseous fuel is ignited by compression igniting a relatively small injection quantity of liquid diesel fuel. The dual fuel system may be operated in a single fuel limp home mode in which liquid diesel fuel is injected at higher pressures. Over pressurization of the gaseous fuel side of the fuel system due to leaked liquid fuel is avoided by regularly injecting leaked liquid fuel, but not gaseous fuel, from the gaseous nozzle outlet set during the limp home mode of operation.Type: ApplicationFiled: January 2, 2013Publication date: July 3, 2014Applicant: CATERPILLAR INC.Inventors: Cory A. Brown, Joshua W. Steffen, Dana R. Coldren, Alan R. Stockner, Hoisan Kim, Dianqi Fang
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Patent number: 8505514Abstract: A common rail single fluid injection system including fuel injectors with the ability to produce multiple injection rate shapes. This is accomplished by including auxiliary filling orifices which selectively provide pressurized fluid to the check needle control chamber during injection events. In so doing, the speed and movement of the check needle is manipulated and differing injection rates may be achieved.Type: GrantFiled: March 9, 2010Date of Patent: August 13, 2013Assignee: Caterpillar Inc.Inventors: Dianqi Fang, Lin Zhang, Stephen Robert Lewis, Zhenlong Xu, Avinash R. Manubolu, Shriprasad G. Lakhapati, Christopher D. Hanson
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Publication number: 20110220064Abstract: A common rail single fluid injection system including fuel injectors with the ability to produce multiple injection rate shapes. This is accomplished by including auxiliary filling orifices which selectively provide pressurized fluid to the check needle control chamber during injection events. In so doing, the speed and movement of the check needle is manipulated and differing injection rates may be achieved.Type: ApplicationFiled: March 9, 2010Publication date: September 15, 2011Applicant: Caterpillar Inc.Inventors: Dianqi Fang, Lin Zhang, Stephen Robert Lewis, Zhenlong Xu, Avinash R. Manubolu, Shriprasad G. Lakhapati, Christopher D. Hanson
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Patent number: 7980224Abstract: A fuel system includes a plurality of fuel injectors fluidly connected to a common rail. Each of the fuel injectors has at least one body component and includes an intensifier control valve for controlling movement of an intensifier piston, a needle control valve for controlling movement of a needle valve member, and exactly one electrical actuator coupled with the intensifier control valve and the needle control valve via a coupling linkage. The intensifier control valve and the needle control valve each include a valve member that is movable with respect to a valve seat. The electrical actuator includes an intermediate position during which the valve member of one of the intensifier control valve and the needle control valve is in contact with the respective valve seat, and the valve member of the other of the intensifier control valve and the needle control valve is out of contact with the respective valve seat.Type: GrantFiled: February 3, 2009Date of Patent: July 19, 2011Assignee: Caterpillar Inc.Inventors: Stephen R. Lewis, Bradley E. Bartley, Avinash R. Manubolu, Shriprasad G. Lakhapati, Dianqi Fang, Michael Gerstner, Christopher D. Hanson, Jeffrey M. Mullinix
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Publication number: 20090194072Abstract: A fuel system includes a plurality of fuel injectors fluidly connected to a common rail. Each of the fuel injectors has at least one body component and includes an intensifier control valve for controlling movement of an intensifier piston, a needle control valve for controlling movement of a needle valve member, and exactly one electrical actuator coupled with the intensifier control valve and the needle control valve via a coupling linkage. The intensifier control valve and the needle control valve each include a valve member that is movable with respect to a valve seat. The electrical actuator includes an intermediate position during which the valve member of one of the intensifier control valve and the needle control valve is in contact with the respective valve seat, and the valve member of the other of the intensifier control valve and the needle control valve is out of contact with the respective valve seat.Type: ApplicationFiled: February 3, 2009Publication date: August 6, 2009Inventors: Stephen R. Lewis, Bradley E. Bartley, Avinash R. Manubolu, Shriprasad G. Lakhapati, Dianqi Fang, Michael Gerstner, Christopher D. Hanson, Jeffrey M. Mullinix
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Publication number: 20090165749Abstract: A control valve assembly includes a one-piece valve movable between a first position at which the valve closes a seat defined by a housing and positioned fluidly between a fluid inlet and a first fluid outlet, and a second position at which the valve is out of contact with the seat. The valve includes an outer diameter having an annular seating shoulder located thereon which is configured to contact a frustoconical surface of the seat when the valve is at the first position, and the annular seating shoulder is further configured to deform in response to contacting the frustonical surface without changing a seating diameter associated therewith. Closing the seat with the annular seating shoulder reduces performance variability of the valve over time.Type: ApplicationFiled: December 27, 2007Publication date: July 2, 2009Inventors: Daniel R. Ibrahim, Stephen R. Lewis, Dianqi Fang