Patents by Inventor Doyle Kent Stewart
Doyle Kent Stewart 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: 10234496Abstract: The subject matter of this specification can be embodied in, among other things, a method that includes evaluating an analog electrical current waveform, determining a Boolean waveform based on the evaluated analog electrical current waveform, determining a collection of one or more first durations based on one or more on times identified from the Boolean waveform, determining a collection of one or more second durations based on one or more off times identified from the Boolean waveform, comparing the first durations and the second durations, determining, based on the comparing, an event based on the comparing, identifying a time at which the event occurred, and providing the time as a completion time.Type: GrantFiled: February 16, 2016Date of Patent: March 19, 2019Assignee: Woodward, Inc.Inventors: Suraj Nair, Doyle Kent Stewart
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Publication number: 20170234920Abstract: The subject matter of this specification can be embodied in, among other things, a method that includes evaluating an analog electrical current waveform, determining a Boolean waveform based on the evaluated analog electrical current waveform, determining a collection of one or more first durations based on one or more on times identified from the Boolean waveform, determining a collection of one or more second durations based on one or more off times identified from the Boolean waveform, comparing the first durations and the second durations, determining, based on the comparing, an event based on the comparing, identifying a time at which the event occurred, and providing the time as a completion time.Type: ApplicationFiled: February 16, 2016Publication date: August 17, 2017Inventors: Suraj Nair, Doyle Kent Stewart
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Patent number: 9297321Abstract: A flexible crank angle position sensing device and data structure is provided. The device allows a user to enter specific data into a data structure relating to an encoder wheel used to determine the position of the crank shaft. The specific data is stored in the device and can be recalled for use in specific engine implementations. Furthermore, a user can enter data to describe other encoder wheels associated with a cam shaft of an engine. A data structure relating to a cam shaft encoder wheel relates to the data structure relating to the crank shaft encoder wheel such that various positional information, regarding both the cam shaft and crank shaft, can be detected by the device.Type: GrantFiled: December 13, 2011Date of Patent: March 29, 2016Assignee: Woodward, Inc.Inventors: Wayne Hawken, Doyle Kent Stewart
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Patent number: 8931457Abstract: A multiplexing drive circuit for an AC ignition system having a common leg that includes two switches coupled in series, and one or more dedicated legs, wherein each leg includes two switches coupled in series. The multiplexing drive circuit also includes a transformer for each of the one or more dedicated legs, each transformer having a primary winding coupled between one of the one or more dedicated legs and the common leg, and wherein each transformer has a secondary winding coupled in parallel to a spark plug, and a pulse-width modulated (PWM) switch controller configured to operate the common leg and dedicated leg switches to control characteristics of the spark discharge for the spark plug. Wherein the switch controller is capable of real time diagnostic checks by monitoring the time at which a spark discharge event takes place.Type: GrantFiled: July 1, 2011Date of Patent: January 13, 2015Assignee: Woodward, Inc.Inventors: David C. Petruska, Doyle Kent Stewart, Monte Lee Wegner, Gerald Michael Eberhardt
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Publication number: 20130151194Abstract: A flexible crank angle position sensing device and data structure is provided. The device allows a user to enter specific data into a data structure relating to an encoder wheel used to determine the position of the crank shaft. The specific data is stored in the device and can be recalled for use in specific engine implementations. Furthermore, a user can enter data to describe other encoder wheels associated with a cam shaft of an engine. A data structure relating to a cam shaft encoder wheel relates to the data structure relating to the crank shaft encoder wheel such that various positional information, regarding both the cam shaft and crank shaft, can be detected by the device.Type: ApplicationFiled: December 13, 2011Publication date: June 13, 2013Applicant: Woodward, Inc.Inventors: Wayne Hawken, Doyle Kent Stewart
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Publication number: 20110255208Abstract: A multiplexing drive circuit for an AC ignition system having a common leg that includes two switches coupled in series, and one or more dedicated legs, wherein each leg includes two switches coupled in series. The multiplexing drive circuit also includes a transformer for each of the one or more dedicated legs, each transformer having a primary winding coupled between one of the one or more dedicated legs and the common leg, and wherein each transformer has a secondary winding coupled in parallel to a spark plug, and a pulse-width modulated (PWM) switch controller configured to operate the common leg and dedicated leg switches to control characteristics of the spark discharge for the spark plug. Wherein the switch controller is capable of real time diagnostic checks by monitoring the time at which a spark discharge event takes place.Type: ApplicationFiled: July 1, 2011Publication date: October 20, 2011Applicant: WOODWARD, INC.Inventors: David C. Petruska, Doyle Kent Stewart, Monte Lee Wegner, Gerald Michael Eberhardt
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Patent number: 7665714Abstract: A fail safe mechanism having a return member, valve stem extension, energy storage member, and locking assembly. The valve stem extension is driven by an electrical actuator and configured to drive the return member in a first direction and to be driven by the return member in a second direction. The energy storage member is configured to store energy when the electrical actuator causes the valve stem extension to drive the return member in the first direction and to release the energy stored therein when a disruption of power causes the return member to drive the valve stem extension in the second direction. The locking assembly is configured to hold the return member in a cocked position such that the valve stem extension rotates with the valve independently of the return member and free of influence from the energy storage member while the power is applied to the electrical actuator.Type: GrantFiled: August 15, 2007Date of Patent: February 23, 2010Assignee: Woodward Governor CompanyInventors: Steven Charles Stumbo, Doyle Kent Stewart, Jerry Kaminski
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Publication number: 20090045365Abstract: A fail safe mechanism having a return member, valve stem extension, energy storage member, and locking assembly. The valve stem extension is driven by an electrical actuator and configured to drive the return member in a first direction and to be driven by the return member in a second direction. The energy storage member is configured to store energy when the electrical actuator causes the valve stem extension to drive the return member in the first direction and to release the energy stored therein when a disruption of power causes the return member to drive the valve stem extension in the second direction. The locking assembly is configured to hold the return member in a cocked position such that the valve stem extension rotates with the valve independently of the return member and free of influence from the energy storage member while the power is applied to the electrical actuator.Type: ApplicationFiled: August 15, 2007Publication date: February 19, 2009Applicant: WOODWARD GOVERNOR COMPANYInventors: Steven Charles Stumbo, Doyle Kent Stewart, Jerry Kaminski
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Patent number: 6752135Abstract: A control valve module for gaseous fuels on spark ignited reciprocating engines is presented. The control valve module has a valve that controls gaseous fuel flow to a mixer or other device for air/fuel ratio control, an actuator for moving the valve position, and a controller. The controller receives a signal from a heated exhaust gas oxygen (HEGO) sensor that is an indication of the fuel/air ratio and actuates the valve to control the combustion mixture to a precise stoichiometric ratio.Type: GrantFiled: November 12, 2002Date of Patent: June 22, 2004Assignee: Woodward Governor CompanyInventors: Bryant K. McLaughlin, Justin L. Fulton, Larry O. Gray, Doyle Kent Stewart, Gary McDaniel
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Publication number: 20040089279Abstract: A control valve module for gaseous fuels on spark ignited reciprocating engines is presented. The control valve module has a valve that controls gaseous fuel flow to a mixer or other device for air/fuel ratio control, an actuator for moving the valve position, and a controller. The controller receives a signal from a heated exhaust gas oxygen (HEGO) sensor that is an indication of the fuel/air ratio and actuates the valve to control the combustion mixture to a precise stoichiometric ratio.Type: ApplicationFiled: November 12, 2002Publication date: May 13, 2004Applicant: Woodward Governor CompanyInventors: Bryant K. McLaughlin, Justin L. Fulton, Larry O. Gray, Doyle Kent Stewart, Gary McDaniel