Patents by Inventor Lars Hessman

Lars Hessman 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).

  • Patent number: 8249778
    Abstract: The invention relates to a method for controlling the steering feedback torque of a power steering system within a closed loop control system, whereby the power steering system provides an actual value (TACT) of the steering feedback torque, whereby a nominal value (TNOM) of the steering feedback torque is calculated by first processor using vehicle dynamic related measurements or estimates, whereby a difference between said actual value (TACT) of the steering feedback torque and said nominal value (TNOM) of the steering feedback torque is used as an input for a controller providing an controller output (COUT), and whereby an input for the power steering system is provided on basis of said controller output (COUT) influencing said steering feedback torque in a way that the difference between said actual value (TACT) of the steering feedback torque and said a nominal value (TNOM) of the steering feedback torque is eliminated.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: August 21, 2012
    Assignee: GM Global Technology Operations LLC
    Inventors: Veit Held, Lars Hessman
  • Publication number: 20090222169
    Abstract: A method is provided for controlling the steering feedback torque of a power steering system within a closed loop control system. The power steering system provides an actual value (TACT) of the steering feedback torque, a nominal value (TNOM) of the steering feedback torque is calculated by first means using vehicle dynamic related measurements or estimates, a difference between the actual value (TACT) of the steering feedback torque and the nominal value (TNOM) of the steering feedback torque is used as an input for a controller providing an controller output (COUT), and an input for the power steering system is provided on basis of the controller output (COUT) influencing the steering feedback torque in a way that the difference between the actual value (TACT) of the steering feedback torque and the a nominal value (TNOM) of the steering feedback torque is at least reduced and preferably eliminated.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 3, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Veit Held, Lars Hessman