Determination of the absolute angular position of a steering wheel by incremental measurement and measuring the differential speed of the wheels

摘要

The system for determining the absolute angular position theta of a steering wheel ( 1 ) of a motor vehicle with respect to the chassis thereof comprises a device for incrementally measuring the relative angular position delta of the steering wheel, a device ( 2 ) for measuring the differential velocity DeltaV/V of the wheels mounted on the same axle and a processing device ( 8 ) for sampling the angular positions and differential velocities at a period t. Said device comprises computing means suitable to determine at moments tn: the estimate theta*(t_n) of an absolute angular position theta(t_n) according to the differential velocity DeltaV/V, the mean difference offset(t_n) between the angular positions theta*(t_n) and delta(t_i), wherein i is a variant ranging from 0 to n and the absolute angular position theta(t_n) by the addition between the mean difference offset(t_n) and the angular position delta(t_n).