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:
Jul. 15, 2008
Filed:
Apr. 06, 2005
Arnulf Heilig, Schwaebisch Gmuend, DE;
Michael Bischofberger, Schwaebisch Gmuend, DE;
Arnulf Heilig, Schwaebisch Gmuend, DE;
Michael Bischofberger, Schwaebisch Gmuend, DE;
ZF Lenksysteme GmbH, Schwaebisch Gmuend, DE;
Abstract
A method for controlling an electrical power steering system for a vehicle includes an electrical servomotor, a steering device for entering a reference value (θ) of a steering angle into a control andlor regulation device, a moment sensor and an angle sensor for the steering device, a device for estimating the moment (M) at the steering device and an angle sensor for determining the angle (θ) of a power take-off of the electrical servomotor. In order to control the electrical power steering system, which makes a non-critical behavior possible in the event of a malfunction or failure of a moment sensor at the steering device, provisions are made so that an offset value (Δ) is constantly formed from the reference value (δ) of the steering angle and the actual value θof the steering angle, and a virtual moment (M) of the steering device is determined on the basis of the offset value (Δ) and is used to control the electrical servomotor.