Patents by Inventor Frank A. DeMarco
Frank A. DeMarco 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: 8532889Abstract: A variator torque control system adjusts a variator output so that the actual output torque of the variator closely matches an expected output torque. In an example, pressure values of an existing torque control map are supplemented in real time with calculated pressure supplement values based on the current operation of the variator. The pressure supplement value for each mapped pressure value may be derived based on a prior application of the same or another map value.Type: GrantFiled: July 6, 2011Date of Patent: September 10, 2013Assignee: Caterpillar Inc.Inventors: Frank A. Demarco, Brian D. Kuras
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Patent number: 8355054Abstract: An arrangement for, and a method of, acquiring a monochrome image of a target, employ a solid-state imager for capturing return light from the target over a field of view, and for generating an output image data stream having image components arranged in a serial format at a clock frequency, a preprogrammed microprocessor operatively connected to the imager for serially receiving, sampling and processing the image components at a sampling frequency to generate the monochrome image of the target, and a clock frequency adjustment circuit operatively connected to the imager and the microprocessor for adjusting the clock frequency to enable the microprocessor to receive, sample and process the image components and generate the monochrome image.Type: GrantFiled: October 22, 2009Date of Patent: January 15, 2013Assignee: Symbol Technologies, Inc.Inventors: Bradley Carlson, Frank DeMarco, Alan Epshteyn
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Patent number: 8165765Abstract: A method and system for configuring a hydromechanical transmission having a hydraulic pump and a hydraulic motor driven by the hydraulic pump and a pressure-driven actuator employs a particular torque-pressure curve configuration to maximize torque resolution with respect to actuator pressure changes while ensuring that the curve is substantially monotonic in each dimension and at any available motor speed within a predetermined motor speed limit and any available actuator pressure within predetermined actuator pressure limits. The resultant four-dimensional association between actuator pressure, motor speed, primary power source speed and motor torque allows selection of an actuator pressure to provide a desired torque.Type: GrantFiled: May 28, 2010Date of Patent: April 24, 2012Assignee: Caterpillar Inc.Inventors: Frank A. DeMarco, Michael G. Cronin
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Patent number: 8074451Abstract: A hydraulic motor system for improved frequency response includes a hydraulic variator having a pump and a motor, wherein the pump includes a variable angle swash plate, and the system further includes an electric actuator for controlling an angle or torque of the swash plate, thereby controlling the motor output characteristics. The electric actuator for controlling the variable angle swash plate may comprise a linear electric motor, ball screw drive or a rotary electric motor. In an example, the rotary electric motor tilts the swash plate by applying a torque to the swash plate at a point away from its tilt axis. In a further example, the rotary electric motor tilts the swash plate via a worm drive or ball screw drive.Type: GrantFiled: June 2, 2008Date of Patent: December 13, 2011Assignee: Caterpillar Inc.Inventors: Brian D. Kuras, Michael G. Cronin, Frank A. DeMarco, Mustafa Guven, Michael J. Barngrover
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Publication number: 20110295473Abstract: A method and system for configuring a hydromechanical transmission having a hydraulic pump and a hydraulic motor driven by the hydraulic pump and a pressure-driven actuator employs a particular torque-pressure curve configuration to maximize torque resolution with respect to actuator pressure changes while ensuring that the curve is substantially monotonic in each dimension and at any available motor speed within a predetermined motor speed limit and any available actuator pressure within predetermined actuator pressure limits. The resultant four-dimensional association between actuator pressure, motor speed, primary power source speed and motor torque allows selection of an actuator pressure to provide a desired torque.Type: ApplicationFiled: May 28, 2010Publication date: December 1, 2011Applicant: Caterpillar, Inc.Inventors: Frank A. DeMarco, Michael G. Cronin
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Publication number: 20110269597Abstract: A variator torque control system adjusts a variator output so that the actual output torque of the variator closely matches an expected output torque. In an example, pressure values of an existing torque control map are supplemented in real time with calculated pressure supplement values based on the current operation of the variator. The pressure supplement value for each mapped pressure value may be derived based on a prior application of the same or another map value.Type: ApplicationFiled: July 6, 2011Publication date: November 3, 2011Applicant: CATERPILLAR INC.Inventors: FRANK A. DEMARCO, BRIAN D. KURAS
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Patent number: 8000863Abstract: A variator torque control system adjusts a variator output so that the actual output torque of the variator closely matches an expected output torque. In an example, pressure values of an existing torque control map are supplemented in real time with calculated pressure supplement values based on the current operation of the variator. The pressure supplement value for each mapped pressure value may be derived based on a prior application of the same or another map value.Type: GrantFiled: May 31, 2007Date of Patent: August 16, 2011Assignee: Caterpillar Inc.Inventors: Frank A DeMarco, Brian D Kuras
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Publication number: 20110096181Abstract: An arrangement for, and a method of, acquiring a monochrome image of a target, employ a solid-state imager for capturing return light from the target over a field of view, and for generating an output image data stream having image components arranged in a serial format at a clock frequency, a preprogrammed microprocessor operatively connected to the imager for serially receiving, sampling and processing the image components at a sampling frequency to generate the monochrome image of the target, and a clock frequency adjustment circuit operatively connected to the imager and the microprocessor for adjusting the clock frequency to enable the microprocessor to receive, sample and process the image components and generate the monochrome image.Type: ApplicationFiled: October 22, 2009Publication date: April 28, 2011Applicant: SYMBOL TECHNOLOGIES, INC.Inventors: Bradley CARLSON, Frank DeMARCO, Alan EPSHTEYN
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Patent number: 7920949Abstract: A variator torque control system and method utilize a hydraulic actuator to control the variator output via a torque control map, wherein the values of the torque control map are evaluated and modified during use of the map to improve map accuracy. In an example, errors in the map are evaluated to determine whether a system fault has occurred.Type: GrantFiled: May 22, 2007Date of Patent: April 5, 2011Assignee: Caterpillar Inc.Inventors: Brian D Kuras, Frank A DeMarco, Adam J Vaccari, Tyler Bowan
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Patent number: 7822532Abstract: A method of adjusting the operation of an engine-driven machine to avoid engine under-speeding entails converting a received speed or torque command into a power command. When an engine under-speed condition is sensed, the system performs underspeed correction in the power domain before converting the underspeed processed power command back into the units of the original domain. The converted underspeed processed power command is issued to the transmission or other component to alleviate the engine under-speeding condition.Type: GrantFiled: February 8, 2008Date of Patent: October 26, 2010Assignee: Caterpillar IncInventors: Brian D. Hoff, Frank A. DeMarco, Thomas M. Sopko, Michael Barngrover, Brian D. Kuras
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Patent number: 7797081Abstract: A system and method for controlling a variator operate to detect variator torques and/or internal pressures and generates a preliminary corrective command. The preliminary corrective command is transformed via a dynamic transform to account for system characteristics during transient operating conditions such as machine acceleration, such that the acceleration of the system during transient periods is not torque-limited by static torque-control map values. In an embodiment, the acceleration may be positive or negative, and in a further embodiment, braking is automatically applied in the case of negative requested power or desired machine retarding.Type: GrantFiled: June 28, 2007Date of Patent: September 14, 2010Assignee: Caterpillar IncInventors: Frank A DeMarco, Hongliu Du, Brian D Kuras, Thomas M Sopko
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Patent number: 7670260Abstract: A method is provided for increasing a temperature of oil in a continuously variable transmission during engine start-up, the transmission including a fluid pump and motor, and a mechanical transmission. The method includes starting the engine, maintaining the fluid pump at substantially zero displacement, and heating the transmission oil by relative rotation of a first clutch disc and first clutch hub of a first clutch assembly and by relative rotation of a second clutch disc and second clutch hub of a second clutch assembly. The method further includes maintaining a substantially zero net torque from the transmission during the heating of the oil by the first and second clutch assemblies.Type: GrantFiled: May 28, 2008Date of Patent: March 2, 2010Assignee: Caterpillar Inc.Inventor: Frank A. DeMarco
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Patent number: 7660657Abstract: A system and method for largely controlling transmission gear ratio oscillation is disclosed. When shifts are executed substantially at synchronous points rendering hysteretic anti-hunting schemes impractical, the disclosed techniques in any combination thereof may allow for oscillation control via an overridable lock-out timer. For oscillation control during incline navigation and other similar loading scenarios, the transmission may be selectively locked if certain operational criteria are met.Type: GrantFiled: June 29, 2007Date of Patent: February 9, 2010Assignee: Caterpillar Inc.Inventors: Frank A DeMarco, Brian D Kuras, Alberto Martinez, Jr.
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Publication number: 20090298635Abstract: A hydraulic motor system for improved frequency response includes a hydraulic variator having a pump and a motor, wherein the pump includes a variable angle swash plate, and the system further includes an electric actuator for controlling an angle or torque of the swash plate, thereby controlling the motor output characteristics. The electric actuator for controlling the variable angle swash plate may comprise a linear electric motor, ball screw drive or a rotary electric motor. In an example, the rotary electric motor tilts the swash plate by applying a torque to the swash plate at a point away from its tilt axis. In a further example, the rotary electric motor tilts the swash plate via a worm drive or ball screw drive.Type: ApplicationFiled: June 2, 2008Publication date: December 3, 2009Applicant: Caterpillar Inc.Inventors: Brian D. Kuras, Michael G. Cronin, Frank A. DeMarco, Mustafa Guven, Michael J. Barngrover
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Publication number: 20090199814Abstract: A method of adjusting the operation of an engine-driven machine to avoid engine under-speeding entails converting a received speed or torque command into a power command. When an engine under-speed condition is sensed, the system performs underspeed correction in the power domain before converting the underspeed processed power command back into the units of the original domain. The converted underspeed processed power command is issued to the transmission or other component to alleviate the engine under-speeding condition.Type: ApplicationFiled: February 8, 2008Publication date: August 13, 2009Applicant: CATERPILLAR INC.Inventors: Brian D. Hoff, Frank A. DeMarco, Thomas M. Sopko, Michael Barngrover, Brian D. Kuras
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Publication number: 20090011901Abstract: A method is provided for increasing a temperature of oil in a continuously variable transmission during engine start-up, the transmission including a fluid pump and motor, and a mechanical transmission. The method includes starting the engine, maintaining the fluid pump at substantially zero displacement, and heating the transmission oil by relative rotation of a first clutch disc and first clutch hub of a first clutch assembly and by relative rotation of a second clutch disc and second clutch hub of a second clutch assembly. The method further includes maintaining a substantially zero net torque from the transmission during the heating of the oil by the first and second clutch assemblies.Type: ApplicationFiled: May 28, 2008Publication date: January 8, 2009Applicant: Caterpillar Inc.Inventor: Frank A. DeMarco
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Publication number: 20090005941Abstract: A system and method for largely controlling transmission gear ratio oscillation is disclosed. When shifts are executed substantially at synchronous points rendering hysteretic anti-hunting schemes impractical, the disclosed techniques in any combination thereof may allow for oscillation control via an overridable lock-out timer. For oscillation control during incline navigation and other similar loading scenarios, the transmission may be selectively locked if certain operational criteria are met.Type: ApplicationFiled: June 29, 2007Publication date: January 1, 2009Applicant: Caterpillar Inc.Inventors: Frank A. DeMarco, Brian D. Kuras, Alberto Martinez, JR.
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Publication number: 20090005914Abstract: A system and method for controlling a variator operate to detect variator torques and/or internal pressures and generates a preliminary corrective command. The preliminary corrective command is transformed via a dynamic transform to account for system characteristics during transient operating conditions such as machine acceleration, such that the acceleration of the system during transient periods is not torque-limited by static torque-control map values. In an embodiment, the acceleration may be positive or negative, and in a further embodiment, braking is automatically applied in the case of negative requested power or desired machine retarding.Type: ApplicationFiled: June 28, 2007Publication date: January 1, 2009Applicant: Caterpillar Inc.Inventors: FRANK A. DEMARCO, Hongliu Du, Brian D. Kuras, Thomas M. Sopko
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Publication number: 20080300103Abstract: A variator torque control system adjusts a variator output so that the actual output torque of the variator closely matches an expected output torque. In an example, pressure values of an existing torque control map are supplemented in real time with calculated pressure supplement values based on the current operation of the variator. The pressure supplement value for each mapped pressure value may be derived based on a prior application of the same or another map value.Type: ApplicationFiled: May 31, 2007Publication date: December 4, 2008Applicant: Caterpillar Inc.Inventors: Frank A. DeMarco, Brian D. Kuras
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Patent number: D1019785Type: GrantFiled: March 22, 2021Date of Patent: March 26, 2024Assignee: ARISTOCRAT TECHNOLOGIES, INC.Inventors: Bruce Urban, Rena Schoonmaker, Dominic DeMarco, Timothy Barbour, Frank Rodriguez, Rajendrasinh Jadeja, Ariel Turgel, Carlos Terminel Iberri, Tatsuya Adachi, Masataka Kimura, Timothy Hession