Method and system for electrically controlling braking of a vehicle

US4805105A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Eberhard Weiss · Pfullingen, DE
• Manfred Stahl · Châteaudun, FR
• Helmut Domann · Leonberg, DE
• Erich Jung · Villingen-Schwenningen, DE
• Franz Maurer · Kempten, DE

Key dates

• Filing date: Dec 4, 1986
• Grant date: Feb 14, 1989
• Expiry date: Dec 4, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/03
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A brake control system has a controller (52, 53, 54) including hysteresis. To prevent over-shoot of control operation if a comparison between actual braking pressure (P.sub.act) and commanded pressure (P.sub.com) is applied to control valves which, for example, operate pneumatically, so that the brakes will not instantaneously respond, a difference pressure threshold (.DELTA.P.sub.G) is determined and, when the difference pressure level is passed by the difference pressure signal, the valves are controlled to operate in pulse operation, in which each pressure pulse (T.sub.E) is followed by a quieting or pressure-OFF time (T.sub.BER). The pulse sequence and the timing of pulses and pulse gaps is controllable in accordance with pressure levels, operating parameters, pressure difference levels and the like.