Patents by Inventor Kaushik Rajashekara

Kaushik Rajashekara 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).

  • Patent number: 9586690
    Abstract: A control for a hybrid turbo electric aero-propulsion system prioritizes and optimizes the operating parameters, according to a desired optimization objective, for and across a number of different control optimization subsystems of the hybrid turbo electric aero-propulsion system. The control subsystems may include, for example, a propulsion control optimization subsystem and a power plant control optimization subsystem. The optimizations may be based on a system model, which is developed and updated during the operation of the hybrid turbo electric aero-propulsion system.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: March 7, 2017
    Assignees: Rolls-Royce Corporation, Rolls-Royce North American Technologies, Inc.
    Inventors: Kaushik Rajashekara, Christine A. H. Ross, Michael Armstrong, Mark Blackwelder
  • Publication number: 20150367950
    Abstract: A control for a hybrid turbo electric aero-propulsion system prioritizes and optimizes the operating parameters, according to a desired optimization objective, for and across a number of different control optimization subsystems of the hybrid turbo electric aero-propulsion system. The control subsystems may include, for example, a propulsion control optimization subsystem and a power plant control optimization subsystem. The optimizations may be based on a system model, which is developed and updated during the operation of the hybrid turbo electric aero-propulsion system.
    Type: Application
    Filed: November 20, 2013
    Publication date: December 24, 2015
    Inventors: Kaushik RAJASHEKARA, Christine A.H. ROSS, Michael ARMSTRONG, Mark BLACKWELDER
  • Publication number: 20150249417
    Abstract: A control method for a synchronous generator system is disclosed including performing a first parametric optimization to determine a desired stator current angle assuming fixed stator current magnitude and fixed field current magnitude. A second parametric optimization is then performed to determine a desired field current magnitude assuming fixed stator current magnitude and fixed stator current angle. A desired stator current magnitude is calculated using the desired stator current angle and the desired field current magnitude. Finally, the desired stator current magnitude, the desired stator current angle and the desired field current magnitude are output.
    Type: Application
    Filed: December 22, 2014
    Publication date: September 3, 2015
    Inventors: Paul Rancuret, Kaushik Rajashekara, John T. Alt
  • Patent number: 8829692
    Abstract: One embodiment is a packaged device having multiple layers. Another embodiment is a method of forming a packaged device having multiple layers. Conductive layers and insulating layers can be formed with openings exposing semiconductor devices. The semiconductor devices can be wire-bonded to the conductive layers. In some embodiments, parasitic effects and a relative footprint of the packaged device can be reduced.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: September 9, 2014
    Assignee: Rolls-Royce Corporation
    Inventors: Kaushik Rajashekara, Ruxi Wang, Zheng Chen, Dushan Boroyevich
  • Patent number: 8820677
    Abstract: One embodiment of the present application is directed to a unique method for powering one or more critical loads in an aircraft. Another embodiment is a unique apparatus for powering one or more critical loads upon failure of one or more engines. Other embodiments include unique methods, systems, devices, and apparatus' for powering power loads in an aircraft. Further embodiments, forms, features, aspects, benefits, and advantages of the present application shall become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: June 18, 2011
    Date of Patent: September 2, 2014
    Inventors: Kaushik Rajashekara, George A. Pontones
  • Patent number: 8786262
    Abstract: One embodiment of the present invention is a unique method of controlling the output of a synchronous electrical machine. Another embodiment is a unique method of controlling the output of a synchronous electrical machine for powering a load. Still another embodiment is a unique aircraft power generation system. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for fluid driven actuation systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: July 22, 2014
    Assignee: Rolls-Royce Corporation
    Inventors: Kaushik Rajashekara, John Timothy Alt
  • Patent number: 8727270
    Abstract: One embodiment of the present invention is a unique aircraft. Another embodiment is a unique aircraft propulsion system. Still another embodiment is a unique system for taxiing an aircraft without starting one or more main aircraft propulsion engines. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for aircraft taxiing and propulsion systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: May 20, 2014
    Assignee: Rolls-Royce Corporation
    Inventors: Donald Burns, Kaushik Rajashekara
  • Patent number: 8690099
    Abstract: One embodiment of the present invention is a unique aircraft. Another embodiment is a unique propulsion system for an aircraft. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for aircraft and aircraft propulsion systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: April 8, 2014
    Assignee: Rolls-Royce Corporation
    Inventors: Donald Burns, Kaushik Rajashekara
  • Patent number: 8684304
    Abstract: One embodiment of the present invention is a unique aircraft. Another embodiment is a unique aircraft propulsion system. Still another embodiment is a unique system for taxiing an aircraft without starting one or more main aircraft propulsion engines. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for aircraft taxiing and propulsion systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: April 1, 2014
    Assignee: Rolls-Royce Corporation
    Inventors: Donald Burns, Kaushik Rajashekara
  • Publication number: 20140061879
    Abstract: One embodiment is a packaged device having multiple layers. Another embodiment is a method of forming a packaged device having multiple layers. Conductive layers and insulating layers can be formed with openings exposing semiconductor devices. The semiconductor devices can be wire-bonded to the conductive layers. In some embodiments, parasitic effects and a relative footprint of the packaged device can be reduced.
    Type: Application
    Filed: September 4, 2012
    Publication date: March 6, 2014
    Inventors: Kaushik Rajashekara, Ruxi Wang, Zheng Chen, Dushan Boroyevich
  • Patent number: 8570774
    Abstract: An electrical power system includes an alternating current (AC) power source configured to output an AC signal, a single phase pulse-width modulated (PWM) rectifier coupled to the AC power source and to an electrical load; a DC link capacitor coupled in parallel to the load and the PWM rectifier; and an active ripple energy storage circuit. The active ripple energy storage circuit has a first terminal, a second terminal and a third terminal, the active ripple energy storage circuit being coupled in parallel to the electrical load, the PWM rectifier and the DC link capacitor via the first terminal and the second terminal, the third terminal being coupled to the second terminal, the active ripple energy storage circuit being configured to selectively absorb and discharge at least part of the ripple energy.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: October 29, 2013
    Inventors: Ruxi Wang, Fred Wang, Rolando Burgos, Dushan Boroyevich, Kaushik Rajashekara, Stephen A. Long
  • Publication number: 20130027002
    Abstract: One embodiment of the present invention is a unique method of controlling the output of a synchronous electrical machine. Another embodiment is a unique method of controlling the output of a synchronous electrical machine for powering a load. Still another embodiment is a unique aircraft power generation system. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for fluid driven actuation systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Application
    Filed: July 25, 2011
    Publication date: January 31, 2013
    Inventors: Kaushik Rajashekara, John Timothy Alt
  • Publication number: 20120318914
    Abstract: One embodiment of the present application is directed to a unique method for powering one or more critical loads in an aircraft. Another embodiment is a unique apparatus for powering one or more critical loads upon failure of one or more engines. Other embodiments include unique methods, systems, devices, and apparatus' for powering power loads in an aircraft. Further embodiments, forms, features, aspects, benefits, and advantages of the present application shall become apparent from the description and figures provided herewith.
    Type: Application
    Filed: June 18, 2011
    Publication date: December 20, 2012
    Inventors: Kaushik Rajashekara, George A. Pontones
  • Publication number: 20120153076
    Abstract: One embodiment of the present invention is a unique aircraft. Another embodiment is a unique aircraft propulsion system. Still another embodiment is a unique system for taxiing an aircraft without starting one or more main aircraft propulsion engines. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for aircraft taxiing and propulsion systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Application
    Filed: November 16, 2010
    Publication date: June 21, 2012
    Inventors: Donald Burns, Kaushik Rajashekara
  • Publication number: 20120119021
    Abstract: One embodiment of the present invention is a unique aircraft. Another embodiment is a unique propulsion system for an aircraft. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for aircraft and aircraft propulsion systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Application
    Filed: November 16, 2010
    Publication date: May 17, 2012
    Inventors: Donald Burns, Kaushik Rajashekara
  • Publication number: 20120119020
    Abstract: One embodiment of the present invention is a unique aircraft. Another embodiment is a unique aircraft propulsion system. Still another embodiment is a unique system for taxiing an aircraft without starting one or more main aircraft propulsion engines. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for aircraft taxiing and propulsion systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Application
    Filed: November 16, 2010
    Publication date: May 17, 2012
    Inventors: Donald Burns, Kaushik Rajashekara
  • Patent number: 8043758
    Abstract: A method of operating a fuel cell includes the step of selectively connecting and disconnecting the fuel cell to at least one electrical load dependent at least in part upon at least one of a fuel cell voltage, a fuel cell current and a fuel cell temperature.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: October 25, 2011
    Assignee: Delphi Technologies, Inc.
    Inventors: John G. Noetzel, Karl J. Haltiner, Jr., Kaushik Rajashekara
  • Patent number: 7968237
    Abstract: A hybrid fuel cell system comprising a solid-oxide fuel cell system, a proton exchange membrane fuel cell system, a hydrocarbon reformer and a hydrogen separator. A large PEM provides output power, such as motive power for a vehicle, using hydrogen storage that may be resupplied from a separate hydrogen refilling station or from the onboard reformer. The SOFC is preferably small and provides heat and exhaust water that, when recycled into the reformer, allow the reformer to operate endothermically without requiring atmospheric air, thus excluding nitrogen from the reformate stream. Alternatively, the reformer and SOFC are stationary at a base station and the PEM is aboard the vehicle. The SOFC and reformer have sufficient capacity to recharge hydrogen storage in the vehicle in a relatively short period of time, such as overnight.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: June 28, 2011
    Assignee: Delphi Technologies, Inc.
    Inventors: Malcolm James Grieve, Kaushik Rajashekara
  • Publication number: 20100285378
    Abstract: A hybrid fuel cell system comprising a solid-oxide fuel cell system, a proton exchange membrane fuel cell system, a hydrocarbon reformer and a hydrogen separator. A large PEM provides output power, such as motive power for a vehicle, using hydrogen storage that may be resupplied from a separate hydrogen refilling station or from the onboard reformer. The SOFC is preferably small and provides heat and exhaust water that, when recycled into the reformer, allow the reformer to operate endothermically without requiring atmospheric air, thus excluding nitrogen from the reformate stream. Alternatively, the reformer and SOFC are stationary at a base station and the PEM is aboard the vehicle. The SOFC and reformer have sufficient capacity to recharge hydrogen storage in the vehicle in a relatively short period of time, such as overnight.
    Type: Application
    Filed: July 21, 2010
    Publication date: November 11, 2010
    Applicant: DELPHI TECHNOLOGIES, INC.
    Inventors: Malcolm James Grieve, Kaushik Rajashekara
  • Patent number: 7674538
    Abstract: Apparatus and method for operating a fuel cell system including a hydrocarbon catalytic reformer and close-coupled fuel cell stack by recycling anode syngas into the reformer in a range between 60% and 95% of the total syngas. At equilibrium conditions, oxygen required for reforming of hydrocarbon fuel is derived from endothermically reformed water and carbon dioxide in the syngas. Reforming temperature is between about 650° C. to 750° C. The stack exit temperature is about 800° C. to 880° C. such that the required endotherm can be provided by the sensible heat of the recycled syngas. The stack has approximately equal anode and cathode gas flows in opposite directions, resulting in cooling from both the anodes and cathodes.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: March 9, 2010
    Assignee: Delphi Technologies, Inc.
    Inventors: Malcolm J. Grieve, John A. MacBain, Kaushik Rajashekara, Gregory W. Alexander