Wheel spin prevention system

US4583611A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rudiger Frank · Haigerloch, DE
• Herbert Schramm · Leonberg, DE
• Werner Kopper · Brighton, US
• Dieter Worner · Pleidelsheim, DE

Key dates

• Filing date: Aug 28, 1984
• Grant date: Apr 22, 1986
• Expiry date: Aug 28, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2066/001
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A versatile system for preventing spinning of driving wheels, especially for commercial road vehicles, is provided by a braking control system in which a logic system responds not only to positive slip (overdriving) of each driven wheel, but also to negative slip (overbraking) thereof and, likewise, not only to over-acceleration, but also to excessive deceleration of the driven wheels. The cycle of control is started by an over-acceleration signal and terminates by the timing-out of a control phase in which hydraulic brake pressure is reduced. Within a control cycle, brake pressure builds up for a driven wheel in response to the simultaneous occurrence of any one of the following four pairs of conditions at that wheel: (a) presence of over-acceleration and of negative slip; (b) presence of over-acceleration and of positive slip; (c) presence of over-acceleration and absence of negative slip, and (d) presence of over-deceleration and of positive slip. For purposes of braking, but not for purposes of reducing engine torque, when over-acceleration occurs at a first driving wheel at one side of the vehicle, a pseudo-positive-slip signal is generated for the driving wheel on the other s…