Patents by Inventor Ajit S. Grewal

Ajit S. Grewal 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).

  • Barrel cam shift mechanism
    Patent number: 8402859
    Abstract: A shift mechanism for a dual clutch transmission employs a rotating barrel cam having at least three tracks which are engaged by and translate at least three associated cam followers. The cam followers extend from shift fork bodies which slide on rails and include shift forks which bi-directionally translate at least three synchronizer clutches which engage at least five forward gears or speeds and reverse. A single electric motor and gear train drive the barrel cam.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: March 26, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Vijay A. Neelakantan, Bret M. Olson, Jesse B. Bradley, Ajit S. Grewal
  • Hydraulic control for a vehicle powertrain
    Patent number: 8056666
    Abstract: A vehicle powertrain includes an engine capable of being selectively turned on and turned off, a transmission operatively connected to the engine, and a hydraulic control system including a pump in fluid communication with the transmission. The pump is operatively connected to the engine for supplying fluid to the transmission when the engine is on, wherein the pump is idle when the engine is off. The hydraulic control system additionally includes an accumulator arranged to accumulate the fluid when the engine is on. The accumulator is also controlled to accumulate fluid when the engine is on, to retain the fluid when the engine is turned off, and to discharge the fluid to the transmission when the engine is restarted.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: November 15, 2011
    Assignee: GM Global Technology Operations LLC
    Inventors: Micheal P. Portell, Daryl A. Wilton, Carlos E. Marin, Leonid Basin, Ajit S. Grewal
  • BARREL CAM SHIFT MECHANISM
    Publication number: 20110100144
    Abstract: A shift mechanism for a dual clutch transmission employs a rotating barrel cam having at least three tracks which are engaged by and translate at least three associated cam followers. The cam followers extend from shift fork bodies which slide on rails and include shift forks which bi-directionally translate at least three synchronizer clutches which engage at least five forward gears or speeds and reverse. A single electric motor and gear train drive the barrel cam.
    Type: Application
    Filed: November 4, 2009
    Publication date: May 5, 2011
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Vijay A. Neelakantan, Bret M. Olson, Jesse B. Bradley, Ajit S. Grewal
  • HYDRAULIC CONTROL FOR A VEHICLE POWERTRAIN
    Publication number: 20100093488
    Abstract: A vehicle powertrain includes an engine capable of being selectively turned on and turned off, a transmission operatively connected to the engine, and a hydraulic control system including a pump in fluid communication with the transmission. The pump is operatively connected to the engine for supplying fluid to the transmission when the engine is on, wherein the pump is idle when the engine is off. The hydraulic control system additionally includes an accumulator arranged to accumulate the fluid when the engine is on. The accumulator is also controlled to accumulate fluid when the engine is on, to retain the fluid when the engine is turned off, and to discharge the fluid to the transmission when the engine is restarted.
    Type: Application
    Filed: April 22, 2009
    Publication date: April 15, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS , INC.
    Inventors: MICHEAL P. PORTELL, DARYL A. WILTON, CARLOS E. MARIN, LEONID BASIN, AJIT S. GREWAL