DAVID ANDREW PIERPONT
Pilots at Windcrest Ct, Lake Of The Woods, IL

6799552, Oct 5, 2004

Sep 20, 2002

10/247642

Thomas J. Crowell - Peoria IL
David Andrew Pierpont - Dunlap IL

Caterpillar Inc - Peoria IL

F02D 1302

123316, 123 9016

A system for operating an internal combustion engine includes an intake valve moveable between a first position at which fluid is blocked from flowing to or from the cylinder and a second position at which fluid is allowed to pass to or from the cylinder. The system includes a fluid actuator selectively operable to hold the intake valve from moving to the first position during a portion of a compression stroke and a control valve configured to control fluid flow between a source of fluid and the fluid actuator. A fuel supply system supplies a predetermined amount of fuel to the cylinder at an appropriate time during an engine cycle based on at least one engine operating parameter, and a controller determines a need to de-rate the engine based on a sensed parameter relating to source fluid viscosity during a cycle in which the fluid actuator is not operated.

2005027, Dec 22, 2005

Mar 30, 2005

11/092623

David Pierpont - Dunlap IL, US
Thomas Crowell - Metamora IL, US

F02M051/00, F01L001/34, F02B075/02

123478000, 123316000, 123090160

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.

7891345, Feb 22, 2011

Aug 18, 2008

12/222847

David Andrew Pierpont - Dunlap IL, US

Caterpillar Inc. - Peoria IL

F02B 47/08, F02M 25/07

12356817, 12356812, 606052

An exhaust gas recirculation system for a use with an engine having a plurality of cylinders is disclosed. The exhaust gas recirculation system may have an intake passage configured to direct combustion air to all of the plurality of cylinders, and an exhaust passage configured to receive exhaust from fewer than all of the plurality of cylinders. The exhaust gas recirculation system may also have a plurality of separate exhaust conduits in parallel communication with the exhaust passage and configured to direct exhaust from the exhaust passage to the intake passage at multiple locations along a length direction of the intake passage. The multiple locations may be separated from each other by a volume within the intake passage, and the volume may be a function of a total number of the plurality of cylinders, a number of the plurality of cylinders contributing exhaust to the exhaust passage, and a number of the multiple locations.

2008002, Jan 31, 2008

Jul 28, 2006

11/494525

David Andrew Pierpont - Dunlap IL, US
Scott Alan Leman - Eureka IL, US

F01L 1/34, F01N 3/00

60285, 60295, 60297, 123 9015

A power source may have at least one combustion chamber, a first valve configured to control an airflow between an air source and the at least one combustion chamber and a second valve configured to control an exhaust gas flow between the combustion chamber and an exhaust system. The power source may also have a fuel source configured to supply a fuel to the at least one combustion chamber and a controller operatively connected to the first valve and the second valve. The controller may be configured to determine one or more temperatures and, if the one or more temperatures are below a predetermined threshold, cause the first valve to substantially limit the airflow to the combustion chamber and cause the second valve to substantially limit the exhaust gas flow from the combustion chamber, such that a combustion stroke of one or more combustion cycles is executed with air substantially provided during an intake stroke of a previous combustion cycle.

2012022, Sep 6, 2012

May 15, 2012

13/472175

Craig Phillip Hittle - Peoria IL, US
Jonathan P. Kilkenny - Peoria IL, US
David Andrew Pierpont - Dunlap IL, US
Stephan Donald Roozenboom - Washington IL, US

F02B 33/40, F01D 17/10

606051, 415145

A turbocharger for a use with a combustion engine is provided. The turbocharger may have a turbine housing with a first volute, a second volute, and a common outlet. The turbocharger may also have a turbine wheel disposed between the common outlet and the first and second volutes. The turbocharger may further have a first valve configured to selectively fluidly communicate the first volute with the second volute upstream of the turbine wheel, a second valve configured to selectively fluidly communicate the second volute with the common outlet to bypass the turbine wheel, and a common actuator configured to move the first and second valves.

2006001, Jan 19, 2006

Jul 13, 2005

11/179808

Jason Bloms - Peoria IL, US
James Faletti - Spring Valley IL, US
Scott Leman - Eureka IL, US
David Pierpont - Dunlap IL, US
James Weber - Lacon IL, US

F01L 9/02, F01L 1/34

123090120, 123090160

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.

2013023, Sep 19, 2013

May 13, 2013

13/892612

David A. Pierpont - Dunlap IL, US
Daniel Lang - Washington IL, US

Caterpillar, Inc. - Peoria IL

F02B 23/06

123294, 1231936

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.

8096124, Jan 17, 2012

Sep 30, 2008

12/285145

David Andrew Pierpont - Dunlap IL, US
John Parker Timmons - Chillicothe IL, US
Jonathan P. Kilkenny - Peoria IL, US

Caterpillar Inc. - Peoria IL

F02B 33/44

606052, 60612

An exhaust system for a use with a combustion engine is provided. The exhaust system may have a first exhaust manifold configured to receive exhaust from the engine, and at least one turbocharger driven by exhaust from the first exhaust manifold. The exhaust system may also have a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold, and at least two turbochargers driven by exhaust from the second exhaust manifold. The exhaust manifold may further have an exhaust gas recirculation circuit in fluid communication with only the first exhaust manifold. A number of turbochargers that receives exhaust from the first exhaust manifold may be less than a number of turbochargers that receives exhaust from the second exhaust manifold.

6837212, Jan 4, 2005

Dec 19, 2002

10/324291

Jason K. Bloms - Peoria IL, US
Brian G. McGee - Chillicothe IL, US
David Andrew Pierpont - Dunlap IL, US
Jeffrey A. L. Smith - Metamora IL, US

Caterpillar Inc. - Peoria IL

F02B 300

123299, 123300

Apparatuses and methods for delivering fuel to at least two combustion chambers of an engine. A fuel controller receives a first fuel quantity signal indicative of a first desired quantity of fuel to be delivered to each combustion chamber of the engine during a combustion cycle. The fuel controller transmits at least one second fuel quantity signal as a function of the first fuel quantity signal, and transmits at least one third fuel quantity signal as a function of the first fuel quantity signal. The second and third fuel quantity signals are indicative of a respective second and third desired quantities of fuel to be delivered during a combustion cycle. The sum of the fuel quantities corresponding to the second fuel quantity signals transmitted during a combustion cycle are less than the first desired fuel quantity.

2013019, Aug 1, 2013

Jan 31, 2012

13/363017

David Andrew Pierpont - Dunlap IL, US

F02B 37/007

606052

An exhaust system for an engine includes a first exhaust manifold configured to receive exhaust from the engine, a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold, and at least two turbochargers configured to receive exhaust from the first and second exhaust manifolds. The system also includes a first turbocharger valve fluidly connected to one of the at least two turbochargers. The first turbocharger valve is configured to selectively fluidly connect the one of the at least two turbochargers to the first and second exhaust manifolds. The system further includes a recirculation circuit in fluid communication with the first exhaust manifold. The recirculation circuit includes a first recirculation valve configured to regulate passage of exhaust through the recirculation circuit.