The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2014
Filed:
Oct. 12, 2012
GM Global Technology Operations Llc, Detroit, MI (US);
Shawn G. Quinn, Grand Blanc, MI (US);
David P. Hamilton, Clarkston, MI (US);
Mark A. Stebbins, Bloomfield Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Methods and apparatus are provided for attenuating torsional vibration of a steering system. The apparatus can include a housing including a chamber. The housing can be couplable to a rim of a hand wheel of the steering system. The apparatus can include a mass disposed in the chamber of the housing. The mass can have a fixed stiffness. The apparatus can also include a damping fluid disposed in the chamber of the housing. The damping fluid can have a variable stiffness. The apparatus can include a control module that determines a torsional vibration experienced by the steering system and outputs a signal to vary the stiffness of the damping fluid in response to the torsional vibration in substantially real-time.