Patents by Inventor Javed A. Dada

Javed A. Dada 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: 8974345
    Abstract: A method of performing a double swap kickdown shift in a transmission having a main box and a compounder. The compounder is shifted during the hold speed phase of the downshift. The target ratio for the downshift is overshot by an overshoot RPM.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: March 10, 2015
    Assignee: Chrysler Group LLC
    Inventors: Hussein Dourra, Javed Dada
  • Publication number: 20140051543
    Abstract: A method of performing a double swap kickdown shift in a transmission having a main box and a compounder. The compounder is shifted during the hold speed phase of the downshift. The target ratio for the downshift is overshot by an overshoot RPM.
    Type: Application
    Filed: August 17, 2012
    Publication date: February 20, 2014
    Applicant: Chrysler Group LLC
    Inventors: Hussein Dourra, Javed Dada
  • Patent number: 7854683
    Abstract: A system for controlling a torque converter clutch in a vehicle powertrain includes a controller having an input for receiving powertrain operating parameter information. The controller is configured to determine a torque converter speed ratio based on the powertrain operating parameter information and to compare the speed ratio to a specified speed ratio limit. The controller is further configured to determine a target torque converter slip when the speed ratio exceeds or meets or exceeds the specified speed ratio limit; to compare the target slip with a desired slip value based on an vehicle noise, vibration or harshness (NVH) limit; and to control torque transmission of the torque converter clutch based on comparison of the target slip and the desired slip value. A method for controlling a torque converter clutch is also provided.
    Type: Grant
    Filed: June 8, 2006
    Date of Patent: December 21, 2010
    Assignee: Chrysler Group LLC
    Inventors: John W. DeGeorge, Javed A. Dada, Harish Sivasubramanian, Gary K. Lowe, Gary Binienda, Peter Hartman
  • Patent number: 7632215
    Abstract: An automatic transmission for a vehicle includes a main box controlled using a series of clutches, and an underdrive assembly controlled using a series of clutches and at least one overrunning clutch. In achieving a double-swap downshift from a first transmission “gear” employing a first main box clutch and a first underdrive assembly clutch, to a second transmission “gear” employing a second main box clutch and a second underdrive assembly clutch, a controller delays release of the first main box clutch until after the second underdrive assembly clutch has been prefilled, and fully applies the second underdrive assembly clutch only after slip has been detected in both the main box and the underdrive assembly. Additionally, the controller fully applies the second main box clutch only after the second underdrive assembly clutch has itself been fully applied.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: December 15, 2009
    Assignee: Chrysler Group LLC
    Inventors: Hussein Dourra, Javed A. Dada, Teddy Siy, Ali Mourtada
  • Patent number: 7421325
    Abstract: Automated calibration of an automatic transmission design generates upshift scheduling curves in a throttle level/transmission output speed plane based upon laboratory-generated data and user generated drivability data. Downshift scheduling curves and torque converter lock-up and unlock curves are then generated as offsets from breakpoints on corresponding upshift curves, the offsets determined principally from the drivability data.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: September 2, 2008
    Assignee: Chrysler LLC
    Inventors: Bruce Geist, Pradeep Attibele, Javed Dada, John M Rzepecki, II, Alexander Dolpp, David Parenti, William F Resh
  • Publication number: 20080132375
    Abstract: An automatic transmission for a vehicle includes a main box controlled using a series of clutches, and an underdrive assembly controlled using a series of clutches and at least one overrunning clutch. In achieving a double-swap downshift from a first transmission “gear” employing a first main box clutch and a first underdrive assembly clutch, to a second transmission “gear” employing a second main box clutch and a second underdrive assembly clutch, a controller delays release of the first main box clutch until after the second underdrive assembly clutch has been prefilled, and fully applies the second underdrive assembly clutch only after slip has been detected in both the main box and the underdrive assembly. Additionally, the controller fully applies the second main box clutch only after the second underdrive assembly clutch has itself been fully applied.
    Type: Application
    Filed: June 8, 2007
    Publication date: June 5, 2008
    Inventors: Hussein Dourra, Javed A. Dada, Teddy Siy, Ali Mourtada
  • Patent number: 7344477
    Abstract: An automatic transmission for a vehicle includes a multi-plate clutch having an applied state and a released state and an overrunning clutch having an engaged state and an overrunning state. In addition, the transmission includes a controller that effectuates a gear shift of the transmission by applying a volume of fluid to the multi-plate clutch to toggle the multi-plate clutch from the released state to the applied state at approximately the same time the overrunning clutch is toggled into the overrunning state. The applied volume of fluid at which the multi-plate clutch is applied is substantially given by the following equation: VF=VL?(k*T) where VF is the volume, VL is the instantaneous volume at any time, k is a constant, and T is the input torque to the transmission.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: March 18, 2008
    Assignee: Chrysler LLC
    Inventors: Hussein A Dourra, Teddy Siy, Javed Dada, Ali M Mourtada
  • Publication number: 20070287594
    Abstract: A system for controlling a torque converter clutch in a vehicle powertrain includes a controller having an input for receiving powertrain operating parameter information. The controller is configured to determine a torque converter speed ratio based on the powertrain operating parameter information and to compare the speed ratio to a specified speed ratio limit. The controller is further configured to determine a target torque converter slip when the speed ratio exceeds or meets or exceeds the specified speed ratio limit; to compare the target slip with a desired slip value based on an vehicle noise, vibration or harshness (NVH) limit; and to control torque transmission of the torque converter clutch based on comparison of the target slip and the desired slip value. A method for controlling a torque converter clutch is also provided.
    Type: Application
    Filed: June 8, 2006
    Publication date: December 13, 2007
    Inventors: John W. DeGeorge, Javed A. Dada, Harish Sivasubramanian, Gary K. Lowe, Gary Binienda, Peter Hartman
  • Publication number: 20070105692
    Abstract: An automatic transmission for a vehicle includes a multi-plate clutch having an applied state and a released state and an overrunning clutch having an engaged state and an overrunning state. In addition, the transmission includes a controller that effectuates a gear shift of the transmission by applying a volume of fluid to the multi-plate clutch to toggle the multi-plate clutch from the released state to the applied state at approximately the same time the overrunning clutch is toggled into the overrunning state. The applied volume of fluid at which the multi-plate clutch is applied is substantially given by the following equation: VF=VL?(k*T) where VF is the volume, VL is the instantaneous volume at any time, k is a constant, and T is the input torque to the transmission.
    Type: Application
    Filed: November 10, 2005
    Publication date: May 10, 2007
    Inventors: Hussein Dourra, Teddy Siy, Javed Dada, Ali Mourtada
  • Publication number: 20060224291
    Abstract: Automated calibration of an automatic transmission design generates upshift scheduling curves in a throttle level/transmission output speed plane based upon laboratory-generated data and user generated drivability data. Downshift scheduling curves and torque converter lock-up and unlock curves are then generated as offsets from breakpoints on corresponding upshift curves, the offsets determined principally from the drivability data.
    Type: Application
    Filed: April 1, 2005
    Publication date: October 5, 2006
    Inventors: Bruce Geist, Pradeep Attibele, Javed Dada, John Rzepecki, Alexander Dolpp, David Parenti, William Resh
  • Patent number: 6980898
    Abstract: A turbine acceleration control system for a transmission in a vehicle determines a desired turbine acceleration based on a downshift type and an altitude of the vehicle. The turbine acceleration control system determines a downshift type that results from one of a throttle increase, a manual downshift, or vehicle deceleration. An altitude module determines an altitude of the vehicle. A vehicle controller communicates with one or more lookup tables to determine the desired turbine acceleration based on the downshift type and the altitude. Additionally, current turbine speed and torque converter slip are considered by the controller in determining the desired turbine acceleration.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: December 27, 2005
    Assignee: DaimlerChrysler Corporation
    Inventors: Nathan Hosler, Brandon Brigham, Javed Dada, Michael J McNeil
  • Publication number: 20050137770
    Abstract: A turbine acceleration control system for a transmission in a vehicle determines a desired turbine acceleration based on a downshift type and an altitude of the vehicle. The turbine acceleration control system determines a downshift type that results from one of a throttle increase, a manual downshift, or vehicle deceleration. An altitude model determines an altitude of the vehicle. A vehicle controller communicates with one or more lookup tables to determine the desired turbine acceleration based on the downshift type and the altitude. Additionally, current turbine speed and torque converter slip are considered by the controller in determining the desired turbine acceleration.
    Type: Application
    Filed: December 19, 2003
    Publication date: June 23, 2005
    Inventors: Nathan Hosler, Brandon Brigham, Javed Dada, Michael McNeil