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:
Sep. 11, 1990
Filed:
Nov. 09, 1988
Wolfgang Kauss, Lohr-Wombach, DE;
Mannesmann Rexroth GmbH, Lohr/Main, DE;
Abstract
A hydrostatic auxiliary power steering mechanism for motor vehicles is described, in which the steering cylinder power is controlled by a servo mechanism for which a control loop is provided for regulating oil quantity proportional to the turning of the steering wheel. This control loop is connected in parallel to a hand pump driven by the steering wheel. In this way, the transmission ratio of the hand pump can be selected independently of the auxiliary power control loop in such a way that the vehicle remains steerable in all operating conditions. Moreover, there results the possibility of designing the auxiliary power control loop with external feedback in such a way that disturbance variables of a control system comprising the steering valve, the steering cylinders and the steering linkage can be controlled.