Patents by Inventor Etsuko M. STEWART

Etsuko M. STEWART 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).

  • Cam phaser control systems and methods for engine off conditions
    Patent number: 10954830
    Abstract: A control system of a vehicle includes: an electric motor configured to phase rotation of an camshaft of an engine relative to rotation of a crankshaft of the engine; a current module configured to, while the engine is off: selectively transition a current signal back and forth between a first state and a second state; and a motor driver module configured to, while the engine is off: apply power to the electric motor from a battery and adjust a position of the camshaft toward a predetermined position when the current signal is in the first state; and disconnect the electric motor from the battery and allow the position of the camshaft to move away from the predetermined position when the current signal is in the second state.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: March 23, 2021
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Etsuko M. Stewart, Scott T. Feldmann, Pratap S. Murthy
  • CAM PHASER CONTROL SYSTEMS AND METHODS FOR ENGINE OFF CONDITIONS
    Publication number: 20210062690
    Abstract: A control system of a vehicle includes: an electric motor configured to phase rotation of an camshaft of an engine relative to rotation of a crankshaft of the engine; a current module configured to, while the engine is off: selectively transition a current signal back and forth between a first state and a second state; and a motor driver module configured to, while the engine is off: apply power to the electric motor from a battery and adjust a position of the camshaft toward a predetermined position when the current signal is in the first state; and disconnect the electric motor from the battery and allow the position of the camshaft to move away from the predetermined position when the current signal is in the second state.
    Type: Application
    Filed: August 28, 2019
    Publication date: March 4, 2021
    Inventors: Etsuko M. STEWART, Scott T. Feldmann, Pratap S. Murthy