Patent Document ID: 8831853
Application ID: 13941444
Patent Status: 1

Claim One:
1. A system that utilizes a third derivative with respect to time of a wheel speed difference to determine whether a first wheel of a pair of wheels of a wheeled road vehicle is slipping relative to a second wheel of the pair of wheels, wherein the first wheel is a driven wheel, and where the wheeled road vehicle includes a means to reduce, limit, or prevent the development of loss of traction between a driven wheel and a surface over which a driven wheel is traveling, comprising: (a) a first means to determine a wheel speed of each wheel of the pair of wheels and to produce a respective electrical signal proportional to the wheel speed of each wheel in the pair of wheels; (b) a second means adapted to receive each respective signal and to produce a second electrical output signal proportional to the wheel speed difference between the wheel speed of each wheel of the pair of wheels; (c) a third means adapted to receive and process said second electrical output signal so as to produce a third electrical output signal proportional to the third derivative with respect to time of said second electrical output signal, said third electrical signal having a value of zero when there is no slipping between the first wheel and the second wheel; and, (d) a fourth means functionally adapted to receive said third electrical output signal, said fourth means further adapted to process said third electrical output signal such that, if the deviation from zero of said third electrical output signal exceeds a predetermined threshold value, the means to reduce, limit, or prevent the development of loss of traction between a driven wheel and the surface over which a driven wheel is traveling becomes cooperatively engaged.