Process and circuit configuration for controlling a brake system with sequential brake pressure modulation

US4930845A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

• Hans-Wilhelm Bleckmann · Prüm, DE
• Helmut Fennel · Bad Soden, DE
• Johannes Graeber · Frankfurt am Main, DE
• Otto Determann · Darmstadt, DE
• Ivica Batistic · Frankfurt am Main, DE

Key dates

• Filing date: Mar 15, 1989
• Grant date: Jun 5, 1990
• Expiry date: Mar 15, 2009

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T2270/203
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A control system and method for a brake system with anti-locking and/or traction slip control and sequential brake pressure modulation. A modulator pressure pattern is formed in a circuit (33) by measuring and evaluating variables determining the pressure in the control chamber of chambers (21) of a brake pressure modulator (4). The modulator pressure pattern represents, by approximation, the course of pressure in the modulator (4). This modulator pressure pattern is considered in the brake pressure control, that is in determining the excitation periods of the multi-way valves (13-16, 22, 23, 25) determining the pressure in a modulator chamber (21) of the brake pressure modulator (4) and in the wheel brakes (9-12). The pressure pattern is formed by integration of the valve excitation periods of the pressure increase and pressure decrease characteristics of the modulator (4) under consideration or of the entire system.