Control system for an at least temporarily four-wheel-driven motor vehicle

US8078374B2 · kind B2 · utility

Assignee

• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Thomas Vogel · Griesheim, DE
• Gerd Egger · Holzkirchen, DE

Key dates

• Filing date: Aug 10, 2007
• Grant date: Dec 13, 2011
• Expiry date: Oct 12, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2500/7044
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

In the case of a control system for an at least temporarily four-wheel-driven motor vehicle having an electronic control unit, which determines at least the rotational speeds of all wheels and the vehicle speed, and by which the driving torque of a drive unit can be distributed in a variable manner by way of a controllable transfer clutch to primary driving wheels, which are permanently connected with the drive unit, and to secondary driving wheels which, can be connected with the drive unit as required, the control unit closes the transfer clutch when the slip of a rear wheel exceeds the slip of the front wheel of the same vehicle side by a value which is greater than a given first threshold and when, preferably, also the longitudinal deceleration of the vehicle exceeds a given second threshold or the lateral acceleration of the vehicle exceeds a given third threshold.