Patents by Inventor Andrew N. Schifferer
Andrew N. Schifferer 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: 11649609Abstract: A hydraulic system for a machine includes an implement pump, a valve, and an implement valve subsystem. The implement pump includes a load sensing control, and the valve controls the flow of hydraulic fluid to the implement pump. The implement valve subsystem includes one or more implement control subsystems to control movement of an implement. The valve is an electrohydraulic proportional relief valve and includes a solenoid configured to adjust the pressure of hydraulic fluid delivered to the implement pump proportionally to a current delivered through the solenoid.Type: GrantFiled: November 9, 2020Date of Patent: May 16, 2023Assignee: Caterpillar Inc.Inventors: Patrick W. Sullivan, Jr., Ryan R. Stoffel, Beau D. Kuipers, Andrew N. Schifferer, Royce E. Leaders, Fuaad Sayeed
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Publication number: 20220145589Abstract: A hydraulic system for a machine includes an implement pump, a valve, and an implement valve subsystem. The implement pump includes a load sensing control, and the valve controls the flow of hydraulic fluid to the implement pump. The implement valve subsystem includes one or more implement control subsystems to control movement of an implement. The valve is an electrohydraulic proportional relief valve and includes a solenoid configured to adjust the pressure of hydraulic fluid delivered to the implement pump proportionally to a current delivered through the solenoid.Type: ApplicationFiled: November 9, 2020Publication date: May 12, 2022Applicant: Caterpillar Inc.Inventors: Patrick W. Sullivan, JR., Ryan R. Stoffel, Beau D. Kuipers, Andrew N. Schifferer, Royce E. Leaders, Fuaad Sayeed
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Patent number: 9783959Abstract: A method of operating a ride control system of a machine having an accumulator is provided. The method includes detecting a pressure at the accumulator. The method includes generating a first set of input data associated with a drive system and a brake pedal. The method includes generating a second set of input data associated with a lift cylinder. The method also includes determining a working mode of the ride control system based on the first set of input data and the second set of input data. The working mode of the ride control system includes a normal mode and an exposed mode. The method includes operating a ride control activation solenoid valve, upon determining the pressure at the accumulator to be above a predefined threshold, and the working mode of the ride control system to be the exposed mode.Type: GrantFiled: April 21, 2016Date of Patent: October 10, 2017Assignee: Caterpillar Inc.Inventors: Andrew N. Schifferer, Eric W. Cler, Eric C. Hughes
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Patent number: 9683498Abstract: A method for operating an internal combustion engine includes monitoring engine parameters using an electronic controller, determining a surge speed limit for the engine based on a compressor map, determining an offset engine speed based on a margin between the surge speed limit and an engine speed, determining a minimum engine speed based on the margin, applying the offset engine speed to an engine speed signal to provide an adjusted engine speed, and applying the adjusted engine speed to a desired engine speed when a speed of the engine approaches the surge speed limit.Type: GrantFiled: May 19, 2015Date of Patent: June 20, 2017Assignee: Caterpillar Inc.Inventors: Urvish Joshi, Travis Barnes, Eric W. Cler, Anand KrishnamurthyGopalan, Eric A. Hutchison, Kirti Tamhane, Andrew N. Schifferer, Tyler Bowman, Kevin Sergott, Matthew Mowers, Daniel R. Puckett
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Publication number: 20160341136Abstract: A method for operating an internal combustion engine includes monitoring engine parameters using an electronic controller, determining a surge speed limit for the engine based on a compressor map, determining an offset engine speed based on a margin between the surge speed limit and an engine speed, determining a minimum engine speed based on the margin, applying the offset engine speed to an engine speed signal to provide an adjusted engine speed, and applying the adjusted engine speed to a desired engine speed when a speed of the engine approaches the surge speed limit.Type: ApplicationFiled: May 19, 2015Publication date: November 24, 2016Applicant: Caterpillar Inc.Inventors: Urvish Joshi, Travis Barnes, Eric W. Cler, Anand KrishnamurthyGopalan, Eric A. Hutchison, Kirti Tamhane, Andrew N. Schifferer, Tyler Bowman, Kevin Sergott, Matthew Mowers, Daniel R. Puckett
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Publication number: 20160298314Abstract: A system for controlling operations of a machine is provided. A first sensor module generates a signal indicative of an operator command and a second sensor module is configured to generate a signal indicative of a current loading ratio associated with a load arm assembly of the machine. A control module is communicably coupled to the first sensor module and the second sensor module to receive a signal indicative of a current operating mode of the machine, and further to receive the signal indicative of the operator command and the signal indicative of the current loading ratio associated with the load arm assembly of the machine. Further, the control module compares the current loading ratio with a pre-determined load rating of the machine, and selectively limits an action associated with the operator command based on the comparison and the current operating mode of the machine.Type: ApplicationFiled: June 21, 2016Publication date: October 13, 2016Applicant: Caterpillar Inc.Inventors: Nathan R. Fogg, Darren M. Schambach, Andrew N. Schifferer, Eric W. Cler, Aaron R. Shatters, Scott A. McGregor
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Publication number: 20160237652Abstract: A method of operating a ride control system of a machine having an accumulator is provided. The method includes detecting a pressure at the accumulator. The method includes generating a first set of input data associated with a drive system and a brake pedal. The method includes generating a second set of input data associated with a lift cylinder. The method also includes determining a working mode of the ride control system based on the first set of input data and the second set of input data. The working mode of the ride control system includes a normal mode and an exposed mode. The method includes operating a ride control activation solenoid valve, upon determining the pressure at the accumulator to be above a predefined threshold, and the working mode of the ride control system to be the exposed mode.Type: ApplicationFiled: April 21, 2016Publication date: August 18, 2016Applicant: Caterpillar Inc.Inventors: Andrew N. Schifferer, Eric W. Cler, Eric C. Hughes
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Patent number: 8095285Abstract: A method for derating a power source to limit damage to a drive train of a machine including determining a first operational parameter associated with a power conversion unit and a second operational parameter associated with the power source, selecting, based on the first operational parameter associated with the power conversion unit and the second operational parameter associated with the power source, a power source derate value, and reducing an available power output associated with the power source according to the derate value.Type: GrantFiled: June 29, 2007Date of Patent: January 10, 2012Assignee: Caterpillar Inc.Inventors: Andrew N. Schifferer, Matthew A. Tobben, Alan W. Schweizer
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Patent number: 7867136Abstract: A method is provided for limiting a torque output associated with a power conversion unit. The method may include receiving data related to a pressure associated with an implement system hydraulic cylinder, determining, based on the data, a preferred torque value, wherein the preferred torque value is below a predetermined threshold value associated with one or more drive train components, and modifying a torque output associated with a power conversion unit to approximate the preferred torque value.Type: GrantFiled: March 15, 2007Date of Patent: January 11, 2011Assignee: Caterpillar IncInventor: Andrew N. Schifferer
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Patent number: 7797092Abstract: In one aspect, the present disclosure is directed to a method for controlling power distribution. The method includes monitoring at least one parameter associated with a power source including a fuel limit proximity of the power source, generating a control signal based on the at least one parameter, and reducing a load associated with the power source based on a characteristic of the control signal.Type: GrantFiled: November 6, 2006Date of Patent: September 14, 2010Assignee: Caterpillar IncInventors: Andrew N. Schifferer, John D. Baus
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Publication number: 20090000292Abstract: A method for derating a power source to limit damage to a drive train of a machine including determining a first operational parameter associated with a power conversion unit and a second operational parameter associated with the power source, selecting, based on the first operational parameter associated with the power conversion unit and the second operational parameter associated with the power source, a power source derate value, and reducing an available power output associated with the power source according to the derate value.Type: ApplicationFiled: June 29, 2007Publication date: January 1, 2009Inventors: Andrew N. Schifferer, Matthew A. Tobben, Alan W. Schweizer
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Publication number: 20080227596Abstract: A method is provided for limiting a torque output associated with a power conversion unit. The method may include receiving data related to a pressure associated with an implement system hydraulic cylinder, determining, based on the data, a preferred torque value, wherein the preferred torque value is below a predetermined threshold value associated with one or more drive train components, and modifying a torque output associated with a power conversion unit to approximate the preferred torque value.Type: ApplicationFiled: March 15, 2007Publication date: September 18, 2008Inventor: Andrew N. Schifferer
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Publication number: 20080104954Abstract: In one aspect, the present disclosure is directed to a method for controlling power distribution. The method includes monitoring at least one parameter associated with a power source including a fuel limit proximity of the power source, generating a control signal based on the at least one parameter, and reducing a load associated with the power source based on a characteristic of the control signal.Type: ApplicationFiled: November 6, 2006Publication date: May 8, 2008Inventors: Andrew N. Schifferer, John D. Baus