Arrangement for controlling the power transmission to at least two axles of a motor vehicle

US4961476A · kind A · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Lothar Witte · Leinfelden, DE
• Norbert Stelter · Rutesheim, DE
• Ulrich Appt · Stuttgart, DE
• Rolf Geiger · Stuttgart, DE
• Klaus-Gerhard Wolpert · Ditzingen, DE
• Stephan Lawitzki · Rutesheim, DE

Key dates

• Filing date: Mar 30, 1989
• Grant date: Oct 9, 1990
• Expiry date: Mar 30, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60K23/0808
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The arrangement controls a friction element for limiting a rotational speed compensation between the axles of a two-axle or all-wheel-driven vehicle as a function of the difference of the medium wheel speeds of both axles (longitudinal speed difference). This longitudinal speed difference is compared with two driving-speed-dependent tolerance bands, the first tolerance band being determining for positive and the second tolerance band being determining for negative longitudinal speed differences. If the values of the longitudinal speed differences are above the first or below the second tolerance band, the limiting is increased; if the values are within the tolerance bands, the instantaneous limiting is maintained; and if the values are between the tolerance bands, the limiting is reduced. This arrangement may also be expanded to include an adaptation device of the limit criteria with respect to different tread radii of the wheels and a cornering correction device.