A METHOD AND A SYSTEM FOR DETERMINING THE ANGULAR POSITION OF A ROTARY ELEMENT, AND A ROLLING BEARING INCLUDING SUCH A SYSTEM

摘要

A magnetic ring is used that is constrained to rotate with a rotary element that is provided with pairs of poles, and sensors, each suitable for issuing an electric signal (U1 (t)...UN (t) ) that is representative of a magnetic field. The method comprises the steps that consist in verifying (101, 102) each of the signals issued by the sensors and of determining whether at least one of the sensors is faulty. If at least one sensor is then determined as being faulty, the number of faulty sensors is counted (106). If the number of faulty sensors is equal to one, a replacement signal (Udrep(t1)) is calculated (108) that is equivalent to the electric signal that would normally have been issued by the faulty sensor, and the previously calculated replacement signal (Udrep(t1)) is used instead of the electric signal normally issued by the faulty sensor in order to calculate (105) a signal (T (t1) ) that is representative of the angular position of a rotary element relative to the non-rotary element. The replacement signal is calculated as the difference between the previously-stored sum (S (t) ) of the electric signals as delivered by the set of sensors (Ci) prior to detecting failure of the sensor (Cd), and the sum of the electric signals as issued by the other sensors after detecting failure of said sensor.