Patent ID: 6816799
Filing Date: 2004-11-09
Classification: B60G,B60T,B60W,B62D,G05B

Abstract:
A method of estimating a steering angle offset value in a vehicle having a relative position steering angle sensor, said method comprising:providing a mathematical expression for calculating an estimated steering angle offset value, {circumflex over (&dgr;)}off, based upon at least one measured value of a vehicle operating parameter wherein said mathematical expression is definable by: selecting a mathematical model to describe the dynamic behavior of the vehicle which includes a first variable, &dgr;, representing the steering angle of the vehicle, wherein said mathematical model includes at least one of a Kalman filter and a state observer; and substituting, for said first variable, &dgr;, the sum of a second variable, &dgr;Uncenter, representing the relative steering angle position and a third variable, &dgr;off, representing the steering angle offset in said model to provide said mathematical expression; obtaining said at least one measured value for said vehicle; and estimating said steering angle offset value using said at least one measured value and said mathematical expression.