Patents by Inventor Steven A Barnhart

Steven A Barnhart 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).

  • Control strategy for a dual crankshaft engine coupling arrangement
    Patent number: 7300385
    Abstract: A control method for coupling a first engine to a second engine in a vehicle includes determining a current position of a throttle body that regulates power output from the first and second engines. Determining a set speed for the first and second engines that corresponds to a desired power output from the first and second engines. Determining a compensation position for the throttle body and moving the throttle body to the compensation position. Actuating a clutch to a closed position such that the first engine is coupled to the second engine. Determining whether the first engine and the second engine are in phase. Actuating the clutch to slip if the first engine is not in phase with the second engine and actuating the clutch to the closed position when the first engine and the second engine are in phase.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: November 27, 2007
    Assignee: Chrysler LLC
    Inventors: Jeffrey P Cherry, George Konstantakopoulos, Steven A Barnhart, Donald L Carriere
  • Control strategy for a dual crankshaft engine coupling arrangement
    Publication number: 20060065503
    Abstract: A control method for coupling a first engine to a second engine in a vehicle includes determining a current position of a throttle body that regulates power output from the first and second engines. Determining a set speed for the first and second engines that corresponds to a desired power output from the first and second engines. Determining a compensation position for the throttle body and moving the throttle body to the compensation position. Actuating a clutch to a closed position such that the first engine is coupled to the second engine. Determining whether the first engine and the second engine are in phase. Actuating the clutch to slip if the first engine is not in phase with the second engine and actuating the clutch to the closed position when the first engine and the second engine are in phase.
    Type: Application
    Filed: September 28, 2004
    Publication date: March 30, 2006
    Inventors: Jeffrey Cherry, George Konstantakopoulos, Steven Barnhart, Donald Carriere
  • Electric parking sprag
    Patent number: 6125983
    Abstract: A parking sprag is provided for engaging a parking gear of an automotive transmission. The parking sprag includes a sprag mechanism pivotally mounted to a support structure. A linkage assembly operatively engages the sprag mechanism for pivoting the sprag mechanism into engagement with the parking gear. A linkage cam engaged with the linkage assembly and is driven by an electric motor. The electric motor drives the linkage cam which drives the linkage assembly in order to engage the sprag mechanism with the parking gear.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: October 3, 2000
    Assignee: Chrysler Corporation
    Inventors: Richard G. Reed, Jr., Steven A. Barnhart