DETERMINING THE ANGULAR POSITION BY MEANS OF AN X+1-TOOTH CAMSHAFT SENSOR
The invention relates to a method for determining the angular position of a shaft by means of a sensor (1) comprising a toothed wheel (2) comprising p equally angularly distributed teeth (d1-dp) and one additional tooth (d+) and a sensitive element (3) able to detect a tooth (d1-dp, d+), comprising the following steps: - receipt of a tooth signal and the dating thereof, - offsetting of the preceding time intervals: Tn-3 ← Tn-2, Tn-2 ← Tn-1, Tn-1 ← Tn, - determination of the current time interval using the formula Tn = tn-tn-1, - calculation of a ratio using the formula Rn = (Tn * Tn-3) / (Tn-1 * Tn-2), - comparison of the ratio (Rn) against a threshold (G), and if the ratio (Rn) is above the threshold (G), the current-tooth signal (Sn) corresponds to the second tooth (d2) immediately following the first tooth (d1) itself immediately following the additional tooth (d+).