Continental Teves, Inc.

Fritz P E Dilger

A method is disclosed for determining the steering center of a vehicle. The algorithm involves supplying power to a controller after ignition-off to save the steering wheel angle value that is stored in the controller's non-volatile memory. At ignition-on, the steering wheel angle value that was stored in the controller's non-volatile memory is retrieved and compared to a recently calculated probable steering wheel angle value. The recently calculated probable steering wheel angle value is calculated based on an offset compensated value of the vehicle's yaw rate and offset compensated value of the vehicle's lateral acceleration. If the difference between the value stored in the volatile memory and the recently calculated probable steering wheel angle value are within a predetermined range, the value stored in the non-volatile memory will continue to be used.

Steering wheel angle determination

A method is disclosed for determining a steering wheel angle calibration reference value in a vehicle. The vehicle includes a relative steering wheel angle sensor, which is unique in that it receives power directly from the vehicle's battery and interacts with the vehicle's car area network. The vehicle also includes an active yaw controller that interacts with the vehicle's car area network. The steering wheel angle calibration reference value only needs to be updated when power to the relative steering wheel angle sensor has been interrupted.

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Royal Oak, MI, United States of America

Fritz P E Dilger