Patents by Inventor David A. Pierpont

David A. Pierpont 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).

  • Publication number: 20190218993
    Abstract: A method for controlling an engine in response to an increase in a load on the engine is disclosed. The engine includes a cylinder with a piston slidably disposed therein between a top dead center position and a bottom dead center position. The cylinder and the piston define a combustion chamber. The method includes initiating a first injection event and a second injection event. The first injection event includes introducing a first predetermined quantity of fuel into the combustion chamber at least 5 degrees before the piston reaches the top dead center position. The second injection event includes introducing a second predetermined quantity of fuel into the combustion chamber not earlier than 30 degrees after the piston moves away from the top dead center position.
    Type: Application
    Filed: January 16, 2018
    Publication date: July 18, 2019
    Applicant: Caterpillar Inc.
    Inventors: Ryan T. Sunley, David A. Pierpont, Jason J. Rasmussen
  • Patent number: 9664093
    Abstract: A method for calculating exhaust gas temperature indirectly at points in or around an engine exhaust after treatment system for use in determining an amount of unburned hydrocarbons resident therein at a given point in time.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: May 30, 2017
    Assignee: Caterpillar Inc.
    Inventors: Brandon Abel, David Pierpont, Adwait Joshi
  • Publication number: 20170123392
    Abstract: A system and method configured to model an engine cylinder system is disclosed. The engine cylinder system having a plurality of components including a cylinder and a piston slideably positioned within the cylinder. The method including operating the piston to move within the cylinder, sensing a first at least one engine operating parameter during operation of the piston, and calculating a second at least one engine operating parameter based on the first at least one engine operating parameter. Based on the first at least one engine operating parameter and the second at least one engine operating parameter, a heat flux for at least one of the plurality of components and an operating cylinder pressure are calculated.
    Type: Application
    Filed: October 28, 2015
    Publication date: May 4, 2017
    Applicant: Caterpillar Inc.
    Inventors: Keith Troisi, David Pierpont, Raghuvansh Ramaswamy
  • Publication number: 20160281574
    Abstract: A method for calculating exhaust gas temperature indirectly at points in or around an engine exhaust after treatment system for use in determining an amount of unburned hydrocarbons resident therein at a given point in time.
    Type: Application
    Filed: March 27, 2015
    Publication date: September 29, 2016
    Applicant: Caterpillar Inc.
    Inventors: Brandon Abel, David Pierpont, Adwait Joshi
  • Publication number: 20160273445
    Abstract: A system for controlling flow of exhaust gas into a turbocharger of an engine is provided. The system includes an exhaust manifold having a first outlet port and a second outlet port. A valve element is pivotally coupled between the first and the second outlet ports. The system includes a control module that determines a value of load condition of the engine. The control module actuates the valve element from a first position to a second position when the value of the load condition is less than a threshold. In the first position, the valve element directs exhaust gas received from a first set of cylinders and a second set of cylinders to the first outlet port and the second outlet port, respectively. In the second position, the valve element allows the exhaust gas to enter one of the first outlet port and the second outlet port.
    Type: Application
    Filed: May 31, 2016
    Publication date: September 22, 2016
    Applicant: Caterpillar Inc.
    Inventor: David A. Pierpont
  • Patent number: 9328693
    Abstract: A piston for reduced production of particulate matter during combustion of a fuel directly injected after a top dead center position includes a piston body defining a piston body diameter of about 263 mm, and a combustion face upon the first axial body end. The combustion face includes a combustion bowl, and an annular piston rim extending circumferentially around the combustion bowl. Inner and outer rim surfaces together comprise a horizontal width of the rim in a ratio of about 1:1 to about 2:1. The inner rim surface includes a chamfer sloping from about 9° to about 11°, such that a profile of the rim is relieved to limit deflection by the piston of the directly injected fuel toward a cylinder wall.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: May 3, 2016
    Assignee: Electro-Motive Diesel, Inc.
    Inventors: David A. Pierpont, John P. Timmons, Michael B. Goetzke, Kenneth M. Sinko, Reddy Pocha Siva Sankara
  • Patent number: 9238996
    Abstract: A piston for an internal combustion engine includes a piston body having an outer cylindrical surface defining a longitudinal piston axis, a combustion face defining a compound combustion bowl, and a compound rim extending radially outward from the compound combustion bowl to the outer cylindrical surface. The compound combustion bowl includes a convex inner bowl surface defining a conical projection and a concave outer bowl surface. The compound rim includes a flat outer rim surface adjoining the outer cylindrical surface, and a convex inner rim surface adjoining the compound combustion bowl. The convex inner bowl surface transitions smoothly to the concave outer bowl surface, and the convex inner rim surface transitions abruptly to the concave outer bowl surface at an edge of the compound combustion bowl.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: January 19, 2016
    Assignee: Caterpillar Inc.
    Inventors: William L. Easley, David A. Pierpont, Karthikeyan C. Venkatasubramaniam, John P. Timmons
  • Patent number: 9234451
    Abstract: A piston for a compression ignition internal combustion engine includes a piston body having a combustion face defining a combustion bowl, and the combustion face including a compound bowl surface and a compound rim surface. The combustion face is profiled to balance a combustion efficiency property of the piston with emissions properties of the piston. A ratio of a diameter of the combustion bowl to a diameter of the cylinder bowl bore is from 0.68 to 0.74. Other dimensional and proportional features of the piston support low smoke and NOx production during operation.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: January 12, 2016
    Assignee: Caterpillar Inc.
    Inventors: Aaron Karch, David A. Pierpont, Daniel Lang, James A. Subatch
  • Publication number: 20150128899
    Abstract: A piston for an internal combustion engine includes a piston body having an outer cylindrical surface defining a longitudinal piston axis, a combustion face defining a compound combustion bowl, and a compound rim extending radially outward from the compound combustion bowl to the outer cylindrical surface. The compound combustion bowl includes a convex inner bowl surface defining a conical projection and a concave outer bowl surface. The compound rim includes a flat outer rim surface adjoining the outer cylindrical surface, and a convex inner rim surface adjoining the compound combustion bowl. The convex inner bowl surface transitions smoothly to the concave outer bowl surface, and the convex inner rim surface transitions abruptly to the concave outer bowl surface at an edge of the compound combustion bowl.
    Type: Application
    Filed: January 20, 2015
    Publication date: May 14, 2015
    Applicant: Caterpillar Inc.
    Inventors: William L. Easley, David A. Pierpont, Karthikeyan C. Venkatasubramaniam, John P. Timmons
  • Patent number: 8978621
    Abstract: A piston for a compression ignition internal combustion engine includes a piston body having a combustion face defining a combustion bowl, and the combustion face including a compound bowl surface and a compound rim surface. The combustion face is profiled to balance a combustion efficiency property of the piston with emissions properties of the piston, and includes a profile of rotation defining a convex curve segment bisected by the longitudinal axis, and a plurality of concave curve segments outboard of the convex curve segment. The profile of rotation further includes a compound rim profile defining a plurality of convex curve segments corresponding to an inner rim surface. The convex curve segment of the compound bowl profile defines a relatively small radius of curvature, and the plurality of convex curve segments corresponding to the inner rim surface define a relatively large radius of curvature.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: March 17, 2015
    Assignee: Caterpillar Inc.
    Inventors: William L. Easley, David A. Pierpont, Karthikeyan C. Venkatasubramaniam, John P. Timmons
  • Publication number: 20150020767
    Abstract: A piston for reduced production of particulate matter during combustion of a fuel directly injected after a top dead center position includes a piston body defining a piston body diameter of about 263 mm, and a combustion face upon the first axial body end. The combustion face includes a combustion bowl, and an annular piston rim extending circumferentially around the combustion bowl. Inner and outer rim surfaces together comprise a horizontal width of the rim in a ratio of about 1:1 to about 2:1. The inner rim surface includes a chamfer sloping from about 9° to about 11°, such that a profile of the rim is relieved to limit deflection by the piston of the directly injected fuel toward a cylinder wall.
    Type: Application
    Filed: July 17, 2013
    Publication date: January 22, 2015
    Inventors: David A. Pierpont, John P. Timmons, Michael B. Goetzke, Kenneth M. Sinko, Reddy Pocha Siva Sankar
  • Publication number: 20150020765
    Abstract: A piston for a compression ignition internal combustion engine includes a piston body having an outer cylindrical surface defined along a longitudinal piston axis. A piston includes a combustion face defining a combustion bowl including an inner bowl surface, an inner rim portion and an outer rim portion. The combustion face includes a cross-sectional profile of rotation about the longitudinal piston axis. A first profile of the profile of rotation includes a convex curve segment, a linear segment outboard the convex curve segments and a first set of concave curve segments outboard the linear segment. The first set of concave curve segments defines a first radius of curvature. A second profile is provided outboard the first profile and includes a second set of concave curve segments. The second set of concave curve segments defines a second radius of curvature greater than the first radius of curvature.
    Type: Application
    Filed: July 18, 2013
    Publication date: January 22, 2015
    Inventors: David A. Pierpont, John P. Timmons, Michael B. Goetzke, Reddy Pocha Siva Sankara, Raghavendra Subramanya
  • Publication number: 20130239925
    Abstract: A piston for a compression ignition internal combustion engine includes a piston body having a combustion face defining a combustion bowl, and the combustion face including a compound bowl surface and a compound rim surface. The combustion face is profiled to balance a combustion efficiency property of the piston with emissions properties of the piston. A ratio of a diameter of the combustion bowl to a diameter of the cylinder bowl bore is from 0.68 to 0.74. Other dimensional and proportional features of the piston support low smoke and NOx production during operation.
    Type: Application
    Filed: May 13, 2013
    Publication date: September 19, 2013
    Applicant: Caterpillar, Inc.
    Inventors: Aaron Karch, David A. Pierpont, Daniel Lang, James A. Subatch, Jr.
  • Publication number: 20120023936
    Abstract: A turbine includes a turbine housing (215) including at least two gas passages (236) having substantially the same flow area and disposed on either side of at least one divider wall (240). A turbine wheel (212) includes a plurality of blades (214). A nozzle ring (238) is connected to the turbine housing (215) and disposed around the turbine wheel. The nozzle ring (238) includes an inner ring (242) disposed adjacent the divider wall (240) and at least one outer ring (238). A plurality of vanes (246) is fixedly disposed between the inner and outer rings. The vanes define a plurality of inlet openings (258) therebetween that are in fluid communication with a slot (230) formed in the ring and surrounding the turbine wheel (212). The inner ring (242) is disposed to block a portion of the inlet openings (258) that fluidly communicate with one of the at least two gas passages (236) in the turbine housing (215).
    Type: Application
    Filed: July 27, 2011
    Publication date: February 2, 2012
    Applicant: CATERPILLAR INC.
    Inventors: RICHARD W. KRUISWYK, KERRY A. DELVECCHIO, PAUL W. REISDORF, DAVID A. PIERPONT, STEVE O'HARA
  • Publication number: 20110253096
    Abstract: A piston for a compression ignition internal combustion engine includes a piston body having a combustion face defining a combustion bowl, and the combustion face including a compound bowl surface and a compound rim surface. The combustion face is profiled to balance a combustion efficiency property of the piston with emissions properties of the piston, and includes a profile of rotation defining a convex curve segment bisected by the longitudinal axis, and a plurality of concave curve segments outboard of the convex curve segment. The profile of rotation further includes a compound rim profile defining a plurality of convex curve segments corresponding to an inner rim surface. The convex curve segment of the compound bowl profile defines a relatively small radius of curvature, and the plurality of convex curve segments corresponding to the inner rim surface define a relatively large radius of curvature.
    Type: Application
    Filed: April 18, 2011
    Publication date: October 20, 2011
    Applicant: CATERPILLAR INC.
    Inventors: William L. Easley, David A. Pierpont, John P. Timmons, Karthikeyan C. Venkatasubramaniam
  • Publication number: 20090000604
    Abstract: An engine system for a power unit is disclosed. The engine system includes an exhaust system having at least one exhaust treatment device and an air induction system having at least one heater. The heater is configured to raise the temperature of an intake flow in the air induction system in response to a physical property of the exhaust treatment device.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Inventors: Michael S. Bond, George E. Donaldson, David J. Kapparos, David A. Pierpont
  • Patent number: 7006910
    Abstract: A method and apparatus for determining a parameter associated with a delivery of fuel in an engine. The method and apparatus includes determining an initial parameter value associated with the delivery of fuel, determining at least one compensation factor based on a heating effect of a fuel and a fuel system, and applying the at least one compensation factor to the initial parameter value to derive a compensated parameter value.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: February 28, 2006
    Assignee: Caterpillar Inc.
    Inventors: Scott R. Schuricht, David A. Pierpont, Travis E. Barnes
  • Publication number: 20060011159
    Abstract: A method of controlling an engine is provided. At least one operating parameter of the engine is sensed. The engine is operated in a first mode in response to the sensed operating parameter being at one of a predetermined first set of conditions. In the first mode, a cam assembly moves an intake valve from a first position when a piston starts an intake stroke and the cam assembly returns the intake valve to the first position when the piston completes the intake stroke. The engine is operated in a second mode in response to the sensed operating parameter being at one of a predetermined second set of conditions. In the second mode, the cam assembly moves the intake valve from the first position when the piston starts an intake stroke and an actuator prevents the intake valve from returning to the first position in response to the cam assembly.
    Type: Application
    Filed: July 13, 2005
    Publication date: January 19, 2006
    Inventors: Jason Bloms, James Faletti, Scott Leman, David Pierpont, James Weber
  • Publication number: 20050279329
    Abstract: A method of controlling a variable valve actuation system for an engine is provided. A cam assembly is operated to move an intake valve between a first position and a second position. A parameter indicative of an altitude at which the engine is operating is sensed. A first lookup map is accessed to determine a desired air-to-fuel ratio when the sensed parameter indicates that the engine is operating at an altitude below a first predetermined value. A second lookup map is accessed to determine a desired air-to-fuel ratio when the sensed parameter indicates that the engine is operating at an altitude above the first predetermined value. A desired valve actuation period is determined based on the determined air-to-fuel ratio. The intake valve is prevented from returning to the first position until the end of the determined valve actuation period.
    Type: Application
    Filed: March 30, 2005
    Publication date: December 22, 2005
    Inventors: David Pierpont, Thomas Crowell
  • Patent number: 6912458
    Abstract: A method of controlling a variable valve actuation system for an engine is provided. A cam assembly is operated to move an intake valve between a first position and a second position. A parameter indicative of an altitude at which the engine is operating is sensed. A first lookup map is accessed to determine a desired air-to-fuel ratio when the sensed parameter indicates that the engine is operating at an altitude below a first predetermined value. A second lookup map is accessed to determine a desired air-to-fuel ratio when the sensed parameter indicates that the engine is operating at an altitude above the first predetermined value. A desired valve actuation period is determined based on the determined air-to-fuel ratio. The intake valve is prevented from returning to the first position until the end of the determined valve actuation period.
    Type: Grant
    Filed: June 25, 2003
    Date of Patent: June 28, 2005
    Assignee: Caterpillar Inc
    Inventors: David A. Pierpont, Thomas J. Crowell