Referring to road vehicles, the problem of traction force distribution between the wheels of a driving axle is investigated. Particular attention is devoted to front-wheel-drive automobiles but the main conclusions of this study can be extended easily to other vehicles. The basic features and related limitations pertaining to mechanical systems for traction control are studied. Possible arrangements of non-conventional differentials for traction control are presented, discussed and classified in terms of left/right torque split ratio and efficiency. A non-linear control algorithm is proposed in order to enhance the driveability of two-wheel-drive automobiles fitted with a traction control system. Numerical computations show that the active safety of such automobiles could be considerably enhanced, with respect to that of conventional ones. (A)
Abstract