Patent ID: 6446018
Filing Date: 2002-09-03
Classification: G01P

Abstract:
Method of compensating inaccuracies in a wheel speed sensor, wherein signal-forming elements are arranged on a sensor wheel and wherein a determined angle is associated with a given number of signal-forming elements to determine a wheel speed, and wherein the wheel speed is determined by evaluating the time during which the wheel rotates around the angle, wherein a correction factor which is included in the determination of the wheel speed is memorized with respect to each element to compensate for variations of the signal-forming elements and/or the positioning of the elements, and the correction factors are updated during the driving operation, wherein updating is performed so that the non-corrected wheel speed measured by the sensor is compared with a reference value of the wheel speed established by means of a calculating model, and the correction factor is updated in dependence on this comparison, comprising the steps of:establishing the reference value by way of a calculating model which is based on at least one of an a causal or causal filtering approach having parameters which are adjusted in dependence on the wheel speed so that a defined frequency range of the wheel speed can be measured.