Patents by Inventor Adya S. Tripathi
Adya S. Tripathi 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: 8099224Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. In various embodiments, the appropriate firings are determined dynamically during operation of the engine on a firing opportunity by firing opportunity basis and/or without the use of predefined firing patterns.Type: GrantFiled: May 4, 2011Date of Patent: January 17, 2012Assignee: Tula Technology, Inc.Inventors: Adya S. Tripathi, Chester J. Silvestri
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Publication number: 20110251773Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. In some aspects, methods and arrangements are described for operating an engine in a throttled skip fire mode. In other aspects, methods and arrangements are described for controlling the operational state of a variable displacement engine.Type: ApplicationFiled: January 11, 2011Publication date: October 13, 2011Applicant: TULA TECHNOLOGY, INC.Inventors: Farzad SAHANDIESFANJANI, Chris HAND, Mohammad PIRJABERI, Adya S. TRIPATHI
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Publication number: 20110213541Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Predictive Adaptive control is used to dynamically determine the working cycles to be skipped to provide a desired engine output.Type: ApplicationFiled: May 4, 2011Publication date: September 1, 2011Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20110213540Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. In some aspects, methods and arrangements are described for operating an engine in a throttled skip fire mode. In other aspects, methods and arrangements are described for controlling the operational state of a variable displacement engine.Type: ApplicationFiled: January 11, 2011Publication date: September 1, 2011Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20110208405Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. In various embodiments, the appropriate firings are determined dynamically during operation of the engine on a firing opportunity by firing opportunity basis and/or without the use of predefined firing patterns.Type: ApplicationFiled: May 4, 2011Publication date: August 25, 2011Applicant: Tula Technology, Inc.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Patent number: 7954474Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: GrantFiled: November 9, 2009Date of Patent: June 7, 2011Assignee: Tula Technology, Inc.Inventors: Adya S. Tripathi, Chester J. Silvestri
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Publication number: 20110048372Abstract: The present invention relates to a diesel engine control system and methods for substantially operating a diesel engine at stoichiometric fuel to air ratios. The system may include a fuel processor which receives instructions for a desired engine output and current operating conditions. The fuel processor may also generate fueling instructions for the cylinders, including: substantially regulating fuel delivery into to a first group of cylinders at or near stoichiometric fuel levels, and substantially disabling fuel injection into to a second grouping of cylinders. The number of cylinders being fueled, and therefore undergoing a combustion event corresponds to the desired engine output. This may be calculated by dividing the desired output by the power provided by one cylinder operating at substantially stoichiometric fuel levels. The number of cylinders receiving fuel may be varied over a succession of engine revolutions such that the actual average engine power output conforms to the desired output.Type: ApplicationFiled: July 9, 2010Publication date: March 3, 2011Inventors: Robert W. Dibble, Adya S. Tripathi, Chester J. Silvestri
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Patent number: 7886715Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: GrantFiled: November 9, 2009Date of Patent: February 15, 2011Assignee: Tula Technology, Inc.Inventors: Adya S. Tripathi, Chester J. Silvestri
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Publication number: 20110030657Abstract: A variety of methods and arrangements for controlling the operation of an internal combustion engine in a skip fire variable displacement mode are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. In the variable displacement mode, selected combustion events are skipped so that other working cycles can operate at better thermodynamic efficiency. More specifically, selected “skipped” working cycles are not fired while other “active” working cycles are fired. Typically, fuel is not delivered to the working chambers during skipped working cycles. In one aspect of the invention, a firing pattern is determined that is not fixed but the active working cycles are selected to favor the firing of working chambers that have recently been fired at least in part to reduce wall wetting losses.Type: ApplicationFiled: July 9, 2010Publication date: February 10, 2011Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI, Christopher W. Chandler, Chris Hand, Joshua P. Switkes, Mark Wilcutts
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Patent number: 7849835Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: GrantFiled: November 9, 2009Date of Patent: December 14, 2010Assignee: Tula Technology, Inc.Inventors: Adya S. Tripathi, Chester J. Silvestri
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Publication number: 20100100299Abstract: The present invention relates to system and methods for improving efficiency of an internal combustion engine. This system may include a fuel processor. The system receives instructions for a desired engine output and operating conditions. The system may then determine an operational state corresponding to the desired output. The operational state includes designating the cylinders into one of three categories: working, deactivated and passive. The number of working cylinders is calculated by dividing the desired output by the power provided by one cylinder operating at substantially optimal efficiency. Then the system substantially disables fuel flow to and air flow to the deactivated cylinders, substantially disables fuel flow to and firing of the passive cylinders, and substantially regulates fuel flow to, air flow to and firing of the working cylinders. Firing of the working cylinders is synchronized with engine speed to reduce unwanted engine vibrations.Type: ApplicationFiled: July 10, 2009Publication date: April 22, 2010Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20100050985Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: ApplicationFiled: November 9, 2009Publication date: March 4, 2010Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20100050986Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: ApplicationFiled: November 9, 2009Publication date: March 4, 2010Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20100037857Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: ApplicationFiled: November 9, 2009Publication date: February 18, 2010Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20100006065Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, an engine is controlled to operate in a skip fire variable displacement mode. Feedback control is used to dynamically determine the working cycles to be skipped to provide a desired engine output. In some embodiments a substantially optimized amount of air and fuel is delivered to the working chambers during active working cycles so that the fired working chambers can operate at efficiencies close to their optimal efficiency. In some embodiments, the appropriate firing pattern is determined at least in part using predictive adaptive control. By way of example, sigma delta controllers work well for this purpose. In some implementations, the feedback includes feedback indicative of at least one of actual and requested working cycle firings. In some embodiments, the appropriate firings are determined on a firing opportunity by firing opportunity basis.Type: ApplicationFiled: July 10, 2009Publication date: January 14, 2010Applicant: TULA TECHNOLOGY, INC.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Publication number: 20100010724Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, selected combustion events are skipped during operation of the internal combustion engine so that other working cycles can operate at a better thermodynamic efficiency. In one aspect of the invention, an engine is controlled to operate in a variable displacement mode. In the variable displacement mode, fuel is not delivered to the working chambers (e.g. cylinders) during selected “skipped” working cycles. During active (“non-skipped”) working cycles, a maximum (e.g., unthrottled) amount of air and an optimized amount of fuel is delivered to the relevant working chambers so that the fired working chambers can operate at efficiencies closer to their optimal efficiency. A controller is used to dynamically determine the chamber firings required to provide the engine torque based on the engine's current operational state and conditions.Type: ApplicationFiled: January 16, 2009Publication date: January 14, 2010Applicant: Tula Technology, Inc.Inventors: Adya S. TRIPATHI, Chester J. SILVESTRI
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Patent number: 7577511Abstract: A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, selected combustion events are skipped during operation of the internal combustion engine so that other working cycles can operate at a better thermodynamic efficiency. In one aspect of the invention, an engine is controlled to operate in a variable displacement mode. In the variable displacement mode, fuel is not delivered to the working chambers (e.g. cylinders) during selected “skipped” working cycles. During active (“non-skipped”) working cycles, a maximum (e.g., unthrottled) amount of air and an optimized amount of fuel is delivered to the relevant working chambers so that the fired working chambers can operate at efficiencies closer to their optimal efficiency. A controller is used to dynamically determine the chamber firings required to provide the engine torque based on the engine's current operational state and conditions.Type: GrantFiled: March 17, 2009Date of Patent: August 18, 2009Assignee: Tula Technology, Inc.Inventors: Adya S. Tripathi, Chester J. Silvestri
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Patent number: 7486937Abstract: Power-efficient front-end topologies for radio frequency power amplifiers are described which may be used to implement full-duplex transceivers for wireless mobile terminals such as, for example, cellular phones. At least some of the described topologies employ highly efficient power amplifiers having well-optimized global feedback loops with noise-shaping capability.Type: GrantFiled: May 11, 2006Date of Patent: February 3, 2009Assignee: Cirrus Logic, Inc.Inventors: Gurmail Kandola, Adya S. Tripathi
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Patent number: 7352246Abstract: A generalized amplifier architecture is described which employs noise-shaping feedback, and for which the output waveform closely resembles the input waveform.Type: GrantFiled: September 7, 2007Date of Patent: April 1, 2008Assignee: Cirrus Logic, Inc.Inventors: Babak Mazda, Farzad Sahandiesfanjani, Adya S. Tripathi
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Patent number: 7283001Abstract: A generalized amplifier architecture is described which employs noise-shaping feedback, and for which the output waveform closely resembles the input waveform.Type: GrantFiled: May 10, 2006Date of Patent: October 16, 2007Assignee: Cirrus Logic, Inc.Inventors: Babak Mazda, Farzad Sahandiesfanjani, Adya S. Tripathi