Vehicle operating parameter determination system and method

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 (δ)}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, δ, 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, δ, the sum of a second variable, δUncenter, representing the relative steering angle position and a third variable, δoff, 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.