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. 26, 1999
Filed:
Oct. 22, 1996
Eugen Eberhart, Dusseldorf, DE;
TRW Fahrwerksysteme GmbH & Co. KG, Dusseldorf, DE;
Abstract
The invention discloses a method for controlling the hydraulic pressure in a power steering device that serves for supplying compressed oil to the left and the right chamber of a power steering cylinder via a rotary slide valve with the aid of a pump, wherein a reaction piston arranged on the input shaft in axially movable and rotationally rigid fashion and connected to the control sleeve of the rotary slide valve via an elastic rotary coupling is inserted between the input shaft and the control sleeve of the rotary slide valve, and wherein a hydraulic reaction device controlled by a control unit with dependence on speed and which serves to control the reaction pressure is arranged in a return line for the hydraulic medium which leads away from the reaction piston. According to the invention, the changes in the hydraulic pressure are determined and used as control parameters for the hydraulic reaction device that is controlled with dependence on speed in addition to the parameter speed.