Patent ID: 8649929
Filing Date: 2014-02-11
Classification: B60K,B60W,Y02T,Y10S

Abstract:
1. A vehicle with an all-wheel drive system, comprising: a front axle driven with a front-axle torque, a rear axle driven with a rear-axle torque different from the front-axle torque, with a torque difference between the front-axle torque and the rear-axle torque generating a rotational-speed difference between a front-axle-side rotational speed and a rear-axle-side rotational speed, a friction-determining unit which measures the rotational-speed difference and determines a road friction coefficient based on a value pair derived from the rotational-speed difference and the torque difference, or based on a parameter correlated with the rotational-speed difference and the torque difference, at least one electric machine generating a drive torque of the vehicle and inducing in a recuperation mode an electrical voltage while exerting a recuperation torque onto vehicle wheels of at least one of the front axle and the rear axle, a recuperation manager associated with the electric machine, with the recuperation manager limiting the recuperation torque to an upper limit value representing a maximum transferable recuperation torque, wherein the maximum transferable recuperation torque or a distribution of the recuperation torque onto the front axle and the rear axle is varied as a function of the determined road friction coefficient.