Patents by Inventor Timothy J. Crowley

Timothy J. Crowley 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: 10260425
    Abstract: A fuel system for a gas turbine engine includes, among other things, a plurality of components defining a plurality of localized nodes at distinct locations relative to a fuel flow path, each of the plurality of localized nodes characterized by a distinct set of failure parameters. One or more fuel sensors are configured to measure at least one fuel condition relating to flow through the fuel flow path. A fuel observation assembly is coupled to one or more engine sensors configured to measure at least one engine condition.
    Type: Grant
    Filed: May 5, 2016
    Date of Patent: April 16, 2019
    Assignee: UNITED TECHNOLOGIES CORPORATION
    Inventors: Timothy J. Crowley, Tyler J. Selstad, Sorin Bengea, Robert H. Luppold
  • Patent number: 10253725
    Abstract: A control system for a gas turbine engine, a method for controlling a gas turbine engine, and a gas turbine engine are disclosed. The control system may include a nozzle scheduler for determining an exhaust nozzle position goal based on a nozzle schedule of exhaust nozzle positions related to flight conditions. The control system may further include a control module for determining a control command for the gas turbine engine. The control command may include, at least, a fuel flow command and an exhaust nozzle position command and the control command may be based on, at least, the exhaust nozzle position goal and an estimated thrust value. The control system may further include an actuator for controlling the gas turbine engine based on the control command.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: April 9, 2019
    Assignee: UNITED TECHNOLOGIES CORPORATION
    Inventors: Chaohong Cai, Timothy J. Crowley, Mark E. Lacour, David L. Ma
  • Patent number: 10113487
    Abstract: A control system for a gas turbine engine is disclosed. The control system may include a computer processor. The control system may also include an outer loop control module programmed into the computer processor to determine a torque request based at least in part on a real-time collective lever angle command. The control system may also include an inner loop control module programmed into the computer processor to receive the torque request from the outer loop control module, to determine fuel flow and inlet guide vane schedules based at least in part on the received torque request, and to send signals to a gas generator of the gas turbine engine in order to control the gas generator according to the determined fuel flow and inlet guide vane schedules.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: October 30, 2018
    Assignee: UNITED TECHNOLOGIES CORPORATION
    Inventors: Chaohong Cai, Timothy J. Crowley, Richard P. Meisner
  • Publication number: 20180300191
    Abstract: A method for controlling a gas turbine engine having a constrained model based control (CMBC) system. The method including obtaining information about a current and previous states of the engine, updating model data information in the CMBC and a parameter estimation system based on the obtained information, and identifying trends in the data based on the information. The method also includes diagnosing the engine, based on the identified trends, determining at least one of a new constraint, objective, initial condition, model characteristic, prediction horizon, and control horizon for the control system based on the diagnosing step if the diagnosing step identified a fault condition, and adapting the CMBC system based on the at least one new constraint, objective, initial condition, model characteristic, prediction and control horizon. The method further includes generating at least on control command based on the adapting and commanding an actuator based on the control command.
    Type: Application
    Filed: April 18, 2017
    Publication date: October 18, 2018
    Inventors: Sorin C. Bengea, Tyler J. Selstad, Timothy J. Crowley
  • Patent number: 10036331
    Abstract: A method and control system for an aircraft using a gas turbine engine is provided. The control system includes a controller that includes a load and engine control modules and communicates control signals to a plant that includes a gas generator and a rotor load, an engine estimation module that receives engine state measurements and effector feedback/command signals from the controller and communicates a power turbine torque estimate, and a load estimation module that receives signals including the power turbine torque estimate, a first power turbine speed value, a first power turbine torque value, a second power turbine speed value, a second power turbine torque value, and a rotor speed value. The load estimation module generates one or more of a power turbine speed estimate, a power turbine torque estimate, and a rotor load estimate based on the received signals.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: July 31, 2018
    Assignee: UNITED TECHNOLOGIES CORPORATION
    Inventors: Chaohong Cai, Timothy J. Crowley, Richard P. Meisner
  • Publication number: 20180073441
    Abstract: A method and control system for an aircraft using a gas turbine engine is provided. The control system includes a controller that includes a load and engine control modules and communicates control signals to a plant that includes a gas generator and a rotor load, an engine estimation module that receives engine state measurements and effector feedback/command signals from the controller and communicates a power turbine torque estimate, and a load estimation module that receives signals including the power turbine torque estimate, a first power turbine speed value, a first power turbine torque value, a second power turbine speed value, a second power turbine torque value, and a rotor speed value. The load estimation module generates one or more of a power turbine speed estimate, a power turbine torque estimate, and a rotor load estimate based on the received signals.
    Type: Application
    Filed: September 13, 2016
    Publication date: March 15, 2018
    Inventors: Chaohong Cai, Timothy J. Crowley, Richard P. Meisner
  • Patent number: 9841039
    Abstract: Systems and methods for use with a variable pressure actuator control system for a gas turbine engine are provided. A variable pressure actuator control system for a gas turbine engine may comprise a controller, a pressure regulating electro-hydraulic servo valve assembly (P-EHSV), including a variable restriction flow path, in electronic communication with the controller, a position regulating electro-hydraulic servo valve assembly (X-EHSV), including a network of flow paths, in electronic communication with the controller, a bypass regulator (BPR) in fluid communication with at least one of a pump, the P-EHSV, or the X-EHSV, the BPR configured to be controlled by the P-EHSV via a bypass pressure to vary an available pressure, and an actuator comprising an actuator piston. The variable pressure actuator control system may minimize pressure when possible to increase mission capability for a gas turbine engine.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: December 12, 2017
    Assignee: UNITED TECHNOLOGIES CORPORATION
    Inventors: Joshua Adams, Martin Amari, Timothy J. Crowley
  • Publication number: 20170328567
    Abstract: A multivariable fuel control and estimator (MFCE) of a gas turbine engine for preventing combustor blowout is provided. The MFCE includes a first input port that receives controller requests and provide system usage commands, a second input port that receives measured disturbance values, a third input that receives system and component limits, a fourth input port that receives sensed parameters, a fuel system model of the fuel system of the gas turbine engine and an engine model of the engine system that includes the combustor of the gas turbine engine, a processor that generates a control signal for controlling the fuel valve and generates a control signal for controlling the actuator using the fuel system and engine model based on the controller requests, the measured disturbance values, the system and component limits, and the sensed parameters, and an output port that transmits the control signals to the fuel system.
    Type: Application
    Filed: May 11, 2016
    Publication date: November 16, 2017
    Inventors: Timothy J. Crowley, Tyler J. Selstad, David Gelwan
  • Publication number: 20170321608
    Abstract: A fuel system for a gas turbine engine includes, among other things, a plurality of components defining a plurality of localized nodes at distinct locations relative to a fuel flow path, each of the plurality of localized nodes characterized by a distinct set of failure parameters. One or more fuel sensors are configured to measure at least one fuel condition relating to flow through the fuel flow path. A fuel observation assembly is coupled to one or more engine sensors configured to measure at least one engine condition.
    Type: Application
    Filed: May 5, 2016
    Publication date: November 9, 2017
    Inventors: Timothy J. Crowley, Tyler J. Selstad, Sorin Bengea, Robert H. Luppold
  • Publication number: 20170322571
    Abstract: According to an aspect, a method includes generating, by a computer processor, thermo-fluid parameter estimates of a thermal management system (TMS) of an engine based on sensed parameters and monitoring for TMS component failures based on the thermo-fluid parameter estimates and the sensed parameters. Thermo-mechanical parameter estimates are generated based on selected thermo-fluid parameters. Life usage estimates and life usage rate estimates are generated based on the selected thermo-fluid parameters and the thermo-mechanical parameter estimates. Life usage rate targets are generated based on external commands and the life usage estimates. Limits and goals are modified based on the life usage rate estimates, failure flags, and the life usage rate targets. A model predictive control is applied to command one or more TMS control components based on thermo-mechanical model parameters, the failure flags, and the limits and goals.
    Type: Application
    Filed: May 3, 2016
    Publication date: November 9, 2017
    Inventors: Timothy J. Crowley, Tyler J. Selstad, Ding Xibei
  • Publication number: 20170122345
    Abstract: Systems and methods for use with a variable pressure actuator control system for a gas turbine engine are provided. A variable pressure actuator control system for a gas turbine engine may comprise a controller, a pressure regulating electro-hydraulic servo valve assembly (P-EHSV), including a variable restriction flow path, in electronic communication with the controller, a position regulating electro-hydraulic servo valve assembly (X-EHSV), including a network of flow paths, in electronic communication with the controller, a bypass regulator (BPR) in fluid communication with at least one of a pump, the P-EHSV, or the X-EHSV, the BPR configured to be controlled by the P-EHSV via a bypass pressure to vary an available pressure, and an actuator comprising an actuator piston. The variable pressure actuator control system may minimize pressure when possible to increase mission capability for a gas turbine engine.
    Type: Application
    Filed: October 29, 2015
    Publication date: May 4, 2017
    Applicant: United Technologies Corporation
    Inventors: Joshua Adams, Martin Amari, Timothy J. Crowley
  • Patent number: 9500138
    Abstract: A load power sharing control system for a twin-engine rotorcraft having a first gas turbine engine and a second gas turbine engine is provided.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: November 22, 2016
    Assignee: United Technologies Corporation
    Inventors: Chaohong Cai, Michael H. Levesque, Richard P. Meisner, Timothy J. Crowley, Joshua Adams, Timothy J. Gaudet
  • Publication number: 20160138523
    Abstract: A control system for a gas turbine engine, a method for controlling a gas turbine engine, and a gas turbine engine are disclosed. The control system may include a nozzle scheduler for determining an exhaust nozzle position goal based on a nozzle schedule of exhaust nozzle positions related to flight conditions. The control system may further include a control module for determining a control command for the gas turbine engine. The control command may include, at least, a fuel flow command and an exhaust nozzle position command and the control command may be based on, at least, the exhaust nozzle position goal and an estimated thrust value. The control system may further include an actuator for controlling the gas turbine engine based on the control command.
    Type: Application
    Filed: October 23, 2015
    Publication date: May 19, 2016
    Inventors: Chaohong Cai, Timothy J. Crowley, Mark E. Lacour, David L. Ma
  • Publication number: 20160069277
    Abstract: A system and methods are provided for controlling turboshaft engines. In one embodiment, a method includes receiving input signals for a collective lever angle (CLA) command and real-time power turbine speed (NP) of an engine, determining system data for engine effectors by the control unit based on the input signals for the collective lever angle (CLA) command and the real-time power turbine speed (NP) based on an integrated model for the turboshaft engine including a model of a gas generator section of the turboshaft engine and a model of a power turbine and rotor load section of the turboshaft engine. The method may also include determining control output based on model-based multi-variable control including optimization formulation and a constrained optimization solver. The method may also include outputting one or more control signals for control of the turboshaft engine.
    Type: Application
    Filed: February 19, 2015
    Publication date: March 10, 2016
    Inventors: Richard P. MEISNER, Chaohong Cai, James W. Fuller, Timothy J. Crowley
  • Publication number: 20150113996
    Abstract: A control system for a gas turbine engine is disclosed. The control system may include a computer processor. The control system may also include an outer loop control module programmed into the computer processor to determine a torque request based at least in part on a real-time collective lever angle command. The control system may also include an inner loop control module programmed into the computer processor to receive the torque request from the outer loop control module, to determine fuel flow and inlet guide vane schedules based at least in part on the received torque request, and to send signals to a gas generator of the gas turbine engine in order to control the gas generator according to the determined fuel flow and inlet guide vane schedules.
    Type: Application
    Filed: May 20, 2014
    Publication date: April 30, 2015
    Applicant: United Technologies Corporation
    Inventors: Chaohong Cai, Timothy J. Crowley, Richard P. Meisner
  • Patent number: 5408957
    Abstract: Liquefied petroleum gas (propane), natural gas, hydrogen gas, or the like, is continuously injected at substantially constant pressure into the air intake manifold, or air induction system, of a conventional internal combustion engine, the engine being electronically, or mechanically, controlled to adjust the air to liquid fuel mixture to a optimum value. The engine may use liquid gasoline, methanol, diesel, or any other, primary fuel. When retrofitted to a conventional 2 or 4 stroke, spark or compression ignited engine, the gaseous fuel preferable is supplied from a reservoir where it is stored in liquefied or compressed form through an appropriate pressure control valve to a pipe T installed in the crankcase ventilation pipe. The supply of gaseous fuel is controlled by an ON-OFF solenoid valves which are only operated when the alternator or generator of the engine is running and the engine has attained a predetermined temperature.
    Type: Grant
    Filed: April 28, 1993
    Date of Patent: April 25, 1995
    Inventor: Timothy J. Crowley
  • Patent number: 5311803
    Abstract: A slicer generally resembling a hand held wood planing tool sits atop a block of food to be sliced or shaved, such as cheese. The slicer has a main platform or base which supports a carriage slidable on a guide groove formed in the base. The carriage supports a shaft rotatably mounted therein, from which shaft depends a pair of arms holding a cutting wire between them. The arms are pivotally and adjustably mounted to the shaft. The arms are fixed in place at a desired cutting depth by a screw. A stop located on the underside of the base counteracts the tendency of the block of food to be pushed by the cutting wire. A curved handle disposed upon the carriage enables the same to be moved, thus slicing the food, with one palm bearing thereagainst.
    Type: Grant
    Filed: February 16, 1993
    Date of Patent: May 17, 1994
    Inventor: Timothy J. Crowley