Method and device for determining a rotational frequency of a wheel

A device for determining a rotational frequency of a wheel of a motor vehicle, using a rotational speed sensor including an encoder wheel assigned to the wheel and a sensor element assigned to the encoder wheel, the encoder wheel having impulse sensors that are distributed uniformly over its circumference or at a distance from one another, whose flanks are detectable by the sensor element for determining the rotational frequency, the device comprising:

• a control unit configured to:
• compensate for a modulation of the rotational frequency caused by an eccentricity by:
• dividing the encoder wheel into segments;
• ascertaining a pulse frequency of detected signal impulses;
• averaging the ascertained pulse frequency for each segment;
• determining, as a function of the averaged pulse frequencies, modulation parameters determined for correcting the determined rotational frequency,
• wherein:
• the pulse frequencies that are free from eccentricities are ascertained from the averaged pulse frequencies of the segments that are diametrically opposite to one another.