Device and method for measuring a quantity representing the rotational speed of a motor vehicle and system and method using said device and method

Abstract

The invention concerns a device for measuring a quantity representing the rotational speed of a motor vehicle wheel (14ag, 14ad, 14rg, 14rd), comprising means (22ag, 22ad, 22rg, 22rd) for coding and measuring the rotational speed in the form of electromagnetic pulses, means (24) for determining a time interval including a whole number of said pulses, and means (24) for counting the whole number of said pulses during said time interval. Said device comprises means (24) for determining a quantity representing the radius of the wheel and means (24) for determining said quantity based on the whole number of pulses, on the time interval and on the quantity representing the radius of the wheel.

Dependencies are inferred from the claim text.