Circuit configuration for a brake system having an anti-lock control

US5265947A · kind A · utility

Inventors

• Hans Wupper · Friedrichsdorf, DE
• Helmut Fennel · Bad Soden, DE
• Gunther Buschmann · Griesheim, DE
• Ivica Batistic · Frankfurt am Main, DE
• Norbert Ehmer · Bad Orb, DE
• Robert Kyle Schmidt · Liederbach am Taunus, DE

Key dates

• Filing date: Jul 30, 1991
• Grant date: Nov 30, 1993
• Expiry date: Jul 30, 2011

Classification

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

Abstract

The circuit configuration for a brake system having an anti-locking control generates pulse-type brake pressure control signals. For pressure rebuild-up after a pressure decrease, brake pressure is applied first at a steep and subsequently at a flatter gradient, this being achieved by a variable pulse (P1) and by short fixed pulses (P2) succeeding one another at a large interval. Circuits are provided rendering dependent the pulse and pulse break times (T.sub.1, T.sub.2, T.sub.k) determining the pressure build-up PA0 on the duration of the pressure build-up (T.sub.1) during the steep-rise build-up in the preceding cycle, PA0 on the duration (T.sub.1 +nT.sub.2) of the entire pressure build-up in the preceding cycle, and PA0 on the duration (T.sub.o) of the preceding pressure decrease, with the pulse times being so dimensioned that, at a constant coefficient of friction and at a constant static pressure, the locking limit of the wheel is rereached after a predetermined period of time or after a predetermined pulse number. The duration of the variable and of the fixed pressure build-up pulses is computed from the pressure build-up of the preceding pressure or determined from a stored …