Patents by Inventor Raj Kommareddy

Raj Kommareddy 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).

  • Transmission with L1-L2 shift method while engine braking
    Patent number: 10113639
    Abstract: A transmission includes a stationary member, an input member, and gear sets each having a plurality of nodes. The transmission includes a first clutch that connects a node of one gear set to the stationary member to establish an L1 mode, and a second clutch that connects a node of another gear set to the stationary member to establish a 2L mode. A SOWC is connected between nodes of two gear sets, and a controller, in response to a requested shift L1-L2 shift while engine braking, executes a method to release the first clutch and thereby enters a neutral mode. The SOWC is released when slip across the first clutch exceeds a first threshold, then the first clutch reapplied when a SOWC slip level exceeds another threshold to thereby enter a 1st gear freewheeling mode. The second clutch is reapplied to enter the L2 mode and resume engine braking.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: October 30, 2018
    Assignee: GM Global Technology Operations LLC
    Inventors: Scott A. Kline, Patrick M. Gibson, Raj Kommareddy, Roberto Diaz
  • TRANSMISSION WITH L1-L2 SHIFT METHOD WHILE ENGINE BRAKING
    Publication number: 20170159815
    Abstract: A transmission includes a stationary member, an input member, and gear sets each having a plurality of nodes. The transmission includes a first clutch that connects a node of one gear set to the stationary member to establish an L1 mode, and a second clutch that connects a node of another gear set to the stationary member to establish a 2L mode. A SOWC is connected between nodes of two gear sets, and a controller, in response to a requested shift L1-L2 shift while engine braking, executes a method to release the first clutch and thereby enters a neutral mode. The SOWC is released when slip across the first clutch exceeds a first threshold, then the first clutch reapplied when a SOWC slip level exceeds another threshold to thereby enter a 1st gear freewheeling mode. The second clutch is reapplied to enter the L2 mode and resume engine braking.
    Type: Application
    Filed: December 4, 2015
    Publication date: June 8, 2017
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Scott A. Kline, Patrick M. Gibson, Raj Kommareddy, Roberto Diaz