Patent · US Active

Motor vehicle with all-wheel drive

US8649929B2 · kind B2 · utility

4Cited by

5References

8Claims

0Family size

Assignee

AUDI AG · DE

Inventor

Sebastian Strasser · Ingolstadt, DE

Key dates

Filing date	Sep 9, 2011
Grant date	Feb 11, 2014
Priority date	—
Expiry date	Sep 9, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S903/903
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

In a vehicle having an all-wheel drive system in which the front axle and the rear axle of the vehicle can be driven with differently sized front-axle and rear-axle torques, a rotational-speed difference between a front-axle-side rotational speed and a rear-axle-side rotational speed is established from a torque difference between the front-axle and rear-axle torques. The vehicle includes a unit for determining a road friction coefficient, which unit measures the rotational-speed difference and determines the road friction coefficient based on a value pair derived from the rotational-speed difference and the torque difference or determined from a parameter correlating therewith.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.