Process and circuit arrangement for adapting slip control to the momentary friction value

US4693522A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

• Hans Wupper · Friedrichsdorf, DE
• Gunther Buschmann · Griesheim, DE

Key dates

• Filing date: Jan 13, 1986
• Grant date: Sep 15, 1987
• Expiry date: Jan 13, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/04
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A control circuit for adapting slip control of an anti-skid brake system of an automotive vehicle comprising a friction coefficient identification circuit (31, 31'). Upon the instabilization of a wheel the braking pressure control signals controlling the slip by actuating solenoid valves (36-41) are varied by the output signal of the circuit (31, 31') as a function of the momentary deceleration (v.sub.R) of the fastest wheel and/or on the momentary pressure in the hydraulic brake circuits (52, 53, 54) and thus are adapted to the momentary friction coefficient, which in particular depends on the road condition. In one instance, the gradient of the vehicular reference velocity is varied in dependence on the friction coefficient.