Brake system with control of brake slip and traction slip

US4796959A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

• Wolfram Seibert · Darmstadt, DE
• Norbert Ocvirk · Offenbach, DE
• Guenther Trach · Offenbach, DE
• Joachim Maas · Griesheim, DE

Key dates

• Filing date: Jul 10, 1987
• Grant date: Jan 10, 1989
• Expiry date: Jul 10, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/4827
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A brake system provided for automotive vehicles with front wheel drive or with rear wheel drive has a dual-circuit braking pressure generator (1) and diagonally connected wheel brakes. There is provided an auxiliary-pressure-supply system (5) with a hydraulic pump (6) which is switched on during brake application or when there is an excessive traction slip. In the brake slip control phase an auxiliary pressure is built up by an auxiliary pressure control valve (9), in the traction slip control phase an auxiliary pressure is built up by a 2/2-way valve (10). By separating valves (15, 16) the pressure medium path to the non-driven vehicle wheel (HR, HL) is locked in the traction slip control phase and, via inlet valves (EV.sub.3, EV.sub.4), pressure medium is directly fed from the auxiliary-pressure-supply system (5) into the driven wheels (VL, VR). Connected in parallel with the inlet valves (EV.sub.1, EV.sub.2) connecting the braking pressure generator (1) with the wheel brakes (17-20) is one non-return valve (13, 14) each of which can open toward the braking pressure generator (1).