Patent ID: 7555402
Filing Date: 2009-06-30
Classification: B62D

Abstract:
1. A method for determining the angular position of the steering wheel ( 2 ) of an automobile vehicle electric power-assisted steering system, the steering system comprising an assistance electric motor ( 8 ) controlled by an on-board electronic processor ( 10 ), the assistance electric motor ( 8 ) comprising a plurality (n) of stator poles distributed around its circumference, a measurement of the instantaneous angular position (θ) between two successive poles of the assistance electric motor ( 8 ) being carried out by a sensor, notably of the resolver type ( 13 ) or using the Hall effect, characterized in that it consists in determining in which current sector (tr_motor), a sector of the assistance motor ( determining a relative angular position (Angle_steer_rel) of the steering wheel (  identifying a sector, referred to as neutral sector (tr_motor_neutral), in which the assistance motor ( determining an angular offset (Angle_offset) of the steering wheel ( determining an absolute angular position (Angle_steer_absolute) of the steering wheel (