DETERMINING THE ANGULAR POSITION BY MEANS OF AN X+1-TOOTH CAMSHAFT SENSOR

Disclosed is a method for determining the angular position of a shaft by a sensor including a toothed wheel including p teeth distributed at equal angles and an additional tooth and a sensitive element that is able to detect a tooth, including the following steps: receiving a tooth signal and the date thereof; shifting the preceding time intervals: Tn-3←Tn-2, Tn-2←Tn-1, Tn-1←Tn; determining the current time interval according to the formula Tn=tn−tn-1; calculating a ratio according to the formula Rn=(Tn*Tn-3)/(Tn-1*Tn-2); and comparing the ratio with a threshold, if the ratio is greater than the threshold, the current tooth signal corresponds to the second tooth immediately following the first tooth, itself immediately following the additional tooth.