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).
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Patent number: 8974345Abstract: 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: GrantFiled: August 17, 2012Date of Patent: March 10, 2015Assignee: Chrysler Group LLCInventors: Hussein Dourra, Javed Dada
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Publication number: 20140051543Abstract: 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: ApplicationFiled: August 17, 2012Publication date: February 20, 2014Applicant: Chrysler Group LLCInventors: Hussein Dourra, Javed Dada
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Patent number: 7854683Abstract: 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: GrantFiled: June 8, 2006Date of Patent: December 21, 2010Assignee: Chrysler Group LLCInventors: John W. DeGeorge, Javed A. Dada, Harish Sivasubramanian, Gary K. Lowe, Gary Binienda, Peter Hartman
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Patent number: 7632215Abstract: 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: GrantFiled: June 8, 2007Date of Patent: December 15, 2009Assignee: Chrysler Group LLCInventors: Hussein Dourra, Javed A. Dada, Teddy Siy, Ali Mourtada
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Patent number: 7421325Abstract: 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: GrantFiled: April 1, 2005Date of Patent: September 2, 2008Assignee: Chrysler LLCInventors: Bruce Geist, Pradeep Attibele, Javed Dada, John M Rzepecki, II, Alexander Dolpp, David Parenti, William F Resh
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Publication number: 20080132375Abstract: 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: ApplicationFiled: June 8, 2007Publication date: June 5, 2008Inventors: Hussein Dourra, Javed A. Dada, Teddy Siy, Ali Mourtada
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Patent number: 7344477Abstract: 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: GrantFiled: November 10, 2005Date of Patent: March 18, 2008Assignee: Chrysler LLCInventors: Hussein A Dourra, Teddy Siy, Javed Dada, Ali M Mourtada
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Publication number: 20070287594Abstract: 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: ApplicationFiled: June 8, 2006Publication date: December 13, 2007Inventors: John W. DeGeorge, Javed A. Dada, Harish Sivasubramanian, Gary K. Lowe, Gary Binienda, Peter Hartman
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Publication number: 20070105692Abstract: 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: ApplicationFiled: November 10, 2005Publication date: May 10, 2007Inventors: Hussein Dourra, Teddy Siy, Javed Dada, Ali Mourtada
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Publication number: 20060224291Abstract: 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: ApplicationFiled: April 1, 2005Publication date: October 5, 2006Inventors: Bruce Geist, Pradeep Attibele, Javed Dada, John Rzepecki, Alexander Dolpp, David Parenti, William Resh
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Patent number: 6980898Abstract: 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: GrantFiled: December 19, 2003Date of Patent: December 27, 2005Assignee: DaimlerChrysler CorporationInventors: Nathan Hosler, Brandon Brigham, Javed Dada, Michael J McNeil
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Publication number: 20050137770Abstract: 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: ApplicationFiled: December 19, 2003Publication date: June 23, 2005Inventors: Nathan Hosler, Brandon Brigham, Javed Dada, Michael McNeil