Patent ID: 8632096

Claim:
A system for attenuating torsional vibration of a steering system, comprising: a housing including a chamber, the housing couplable to a rim of a hand wheel of the steering system; a mass disposed in the chamber of the housing, the mass having a fixed stiffness; a damping fluid disposed in the chamber of the housing and having a variable stiffness; and 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, wherein the housing further comprises: a first chamber having a first opening; a second chamber having a second opening and a third opening; and a third chamber having a fourth opening, wherein the damping fluid is received in the housing and flows between the first chamber, second chamber and third chamber via the first opening, second opening, third opening and fourth opening.