Anti-lock braking system

US4962970A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolf-Dieter Jonner · Freising, DE
• Volker Braschel · Neuwied, DE
• Dieter Roller · Schenefeld, DE
• Herbert Demel · Asperg, DE

Key dates

• Filing date: Apr 28, 1989
• Grant date: Oct 16, 1990
• Expiry date: Apr 28, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/06
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An anti-lock braking system is specifically designed for a motor vehicle having four-wheel drive and a device for shifting between two-wheel and four-wheel drive incorporating a lockable central differential. Additional differentials at the front and rear axles may also be locked to avoid wheel spin. The anti-lock braking system produces a brake pressure reduction signal when the wheel speed falls below a reference value. In accordance with the invention the reference value is varied in dependence upon whether the vehicle is shifted into two-wheel or four-wheel drive, in dependence upon the engagement of the central differential lock, and/or in dependence upon the engagement of the other differential lock(s).