US 7,398,854 B2
Method for controlling an electric power steering system
Arnulf Heilig, Schwaebisch Gmuend (Germany); and Michael Bischofberger, Schwaebisch Gmuend (Germany)
Assigned to ZF Lenksysteme GmbH, Schwaebisch Gmuend (Germany)
Filed on Apr. 06, 2005, as Appl. No. 11/100,919.
Claims priority of application No. 10 2004 022 450 (DE), filed on May 06, 2004.
Prior Publication US 2006/0000662 A1, Jan. 05, 2006
Int. Cl. B62D 5/04 (2006.01); B62D 6/00 (2006.01)
U.S. Cl. 180—446  [701/41; 701/42] 13 Claims
OG exemplary drawing
 
1. Method for controlling an electrical power steering for a vehicle comprising an electrical servomotor, having a power take-off, a control and/or regulation device, a steering device for entering a reference value (θS) of a steering angle into the control and/or regulation device, a moment sensor and a first angle sensor for the steering device, an estimating device for estimating the moment (Mv) at the steering device, a second angle sensor for determining the angle (θA) of the power take-off of the electrical servomotor, an offset value (Δθ) being determined constantly from the reference value (δS) of the steering angle and an actual value (θI) of the steering angle and a virtual moment (Mv) of the steering device being determined on the basis of the offset value (Δθ).