Vehicle wheel controlled anti-brake lock braking arrangement

US4575160A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heinz Leiber · Oberriexingen, DE
• Wolf-Dieter Jonner · Freising, DE

Key dates

• Filing date: Jun 14, 1984
• Grant date: Mar 11, 1986
• Expiry date: Jun 14, 2004

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/14
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

To provide for change in application of pressure rate, or pressure gradient, in a simplified control system, a group of shunt valves (36-39; 51, 52), which are normally open, are hydraulically connected in parallel to at least one of the brake fluid control valves (8-11; 43, 44, 45) which receive, hold, or drain pressurized brake fluid from main brake cylinders (2, 3) under command of an automatic braking system evaluation stage or unit (ABS) in accordance with sensed wheel speed, acceleration or deceleration, to apply additional pressurized brake fluid to the brake associated with the wheels. The brake fluid control valves (8-11; 43, 44, 45) include chokes, or have inherent choking action, in their hydraulic path which is bypassed by the shunt valves. Operation of the shunt valves, including a brake fluid feed control valve (12; 48) is controlled by a single electromagnet which is, in turn, controlled by the pressure within the main braking cylinders (2, 3) and/or position of the brake control pedal, so that the pressure gradient or build-up within the brake cylinders of the wheels is either directly controlled through the shunt path through the shunt valves, or through the brake …