Absolute angle sensor

摘要

A rotation angle coder (1) has concentric main (1a) and top (1b) multipolar magnetic tracks with polarity transition singularities (1b1) in the top and a fixed sensor with two main track and one top track elements and three signals counted to give angular position variations and gyroscopic or differential road wheel rate absolute position (8) measurement with error less than the top track repeat. The top track has M singularities arranged in N identical sectors with M/N singularities per sector. Includes Independent claims for a vehicle steering wheel system using the coder.