Patents Assigned to GM Global Technoloogy Operations LLC
  • Patent number: 9689493
    Abstract: A hydraulic control system for a transmission is provided. The hydraulic control system provides a latching system to retain CVT clutch pressure and/or pulley pressure for one or more CVT torque transmitting mechanisms and/or CVT pulleys in a CVT transmission. Components of the hydraulic control system of the present disclosure may include blow off valves, such as ball check-valves, on the exhaust of the pulley control valves and the exhaust of the CVT clutch control valve(s), and a one-way valve, such as a supply ball check-valve, disposed adjacent to each of the fluid supply inlets of the pulley control valves and the fluid supply inlet of the CVT clutch control valve(s).
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: June 27, 2017
    Assignee: GM Global Technoloogy Operations LLC
    Inventor: Philip C. Lundberg