Anti-locking brake control system

US4921314A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Volker Braschel · Neuwied, DE
• Dieter Seitz · Neuwied, DE
• Jochen Schäfer · Bietigheim-Bissingen, DE

Key dates

• Filing date: Sep 26, 1988
• Grant date: May 1, 1990
• Expiry date: Sep 26, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/5006
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An anti-locking brake control system for a motor vehicle comprises wheel speed sensors for determining the speeds of the individual vehicle wheels, an evaluation circuit which receives the wheels speed signals and generates brake pressure control signals, and a brake pressure control device responsive to the brake pressure control signals for controlling the brake pressure applied to the wheels. The evaluation (processing) circuit includes a brake pressure control unit which operates in such a manner that, after brake pressure decays, the brake pressure is first increased in a timed build-up with reference to the brake pressure build-up in a preceding control cycle, and thereafter the brake pressure is further increased by a sequence of pulses until an instability is again detected. The timed pressure build-up has at least two timed pressure build-up phases which have respective durations such that the duration of each one of the timed build-up phases in a given time pressure build-up is longer than the length of the subsequent timed build-up phase in the control cycle. In addition, the duration of the timed build-up is a function of the preceding pressure decay time, this function…