Delphi Technologies, Inc.

Darin Duane Dellinger

David Andrew Shal

John F Hoying

David John Barta

Vardarajan R Iyengar

Robert Alan Neal

Bruce A Heaston

Jamshid Kargar Moradmand

Robin Oakley

Timothy John Juuhl

Michael R Lukuc

Khaled M Jundi

Jesse D Jones

A temperature compensation method for controlling a damping force of a magnetorheological (MR) damper is disclosed. First, a base operating current as a function of a desired force level of a damping force of the MR damper is determined, and a temperature compensation as a function of an operating temperature of the MR damper is determined. Finally, the temperature compensation is applied to the base operating current to generate a compensated operating current as a function of the desired force level of the damping force and the operating temperature of the MR damper. To refine the compensated operating current, the temperature compensation can be determined as both a function of the operating temperature of the MR damper and a relative velocity of the MR damper.

Temperature compensation for magnetorheological fluid dampers

A vehicular damper includes a cylinder, a piston rod in the cylinder having a hollow end defining an axial rod passage and a cylindrical piston affixed to the end of the rod dividing the cylinder into a compression chamber and a rebound chamber. A valve plate on the rod adjacent the piston has a plurality of soft channels extending from an outer end at the rebound chamber to an inner end at the axial rod passage and a solenoid actuated cylinder in the rod passage is movable to open and close the inner ends of the soft channels. A bi-directional working disc contacts with the soft channels' outer ends to provide damping in rebound and compression when the solenoid valve is open. In contrast, the piston has a plurality of firm rebound channels and a like plurality of firm compression channels extending therethrough with a uni-directional rebound working disc in valve contact with the outlet of the rebound chambers and a uni-directional compression working disc in valve contact with the outlet of the compression chambers. The damper provides valved parallel flow between compression and rebound chambers through the soft channels and through the firm channels with independent spring rate control through the firm rebound and compression channels.

Active hydraulic fluid vehicular suspension damper

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Tipp City, OH, United States of America

Darin Duane Dellinger