Patents by Inventor Tomas Martin Hassel

Tomas Martin Hassel 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).

  • Estimating surface friction coefficients using rear-wheel steering excitations
    Patent number: 11318947
    Abstract: Techniques are described for estimating surface friction coefficients using lateral force excitations of one or more rear wheels of a rear wheel steering vehicle. In one example, a computing system is configured to cause excitation of a rear wheel using a lateral force that causes the rear wheel to initiate turning. The computing system may determine one or more slip angles that result from the excitation and determine a relationship between the lateral force and the slip angles. From the lateral force and slip angle relationship, the computing system may estimate the friction coefficient of a surface and may cause maneuvering of the rear wheel steering vehicle, or of another networked vehicle, to be based at least in part on the friction coefficient estimated for a particular driving surface.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: May 3, 2022
    Assignee: Volvo Car Corporation
    Inventors: Tomas Martin Hassel, Derong Yang
  • ESTIMATING SURFACE FRICTION COEFFICIENTS USING REAR-WHEEL STEERING EXCITATIONS
    Publication number: 20210188284
    Abstract: Techniques are described for estimating surface friction coefficients using lateral force excitations of one or more rear wheels of a rear wheel steering vehicle. In one example, a computing system is configured to cause excitation of a rear wheel using a lateral force that causes the rear wheel to initiate turning. The computing system may determine one or more slip angles that result from the excitation and determine a relationship between the lateral force and the slip angles. From the lateral force and slip angle relationship, the computing system may estimate the friction coefficient of a surface and may cause maneuvering of the rear wheel steering vehicle, or of another networked vehicle, to be based at least in part on the friction coefficient estimated for a particular driving surface.
    Type: Application
    Filed: December 23, 2019
    Publication date: June 24, 2021
    Inventors: Tomas Martin Hassel, Derong Yang