Method for adjusting optimal wheel slip

US4862368A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Friedrich Kost · Kornwestheim, DE
• Anton Van Zanten · Ditzingen, DE
• Gerhard Heess · Tamm, DE
• Gerhard Kreisselmeier · Vellmar, DE

Key dates

• Filing date: Feb 4, 1987
• Grant date: Aug 29, 1989
• Expiry date: Feb 4, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/17636
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The goal of this concept is to adjust a wheel slip value, during a controlled braking of a vehicle wheel, at which, on the one hand, the coefficient of adhesion .mu. in the longitudinal direction is near the maximum attainable value, and on the other hand, an adequate coefficient of adhesion is available in the transverse direction. This slip value is below the value at which the coefficient of adhesion in the longitudinal direction is at a maximum. While at the maximum coefficient of adhesion in the longitudinal direction the wheel slip curve .mu. (.lambda.) has a slope of zero, .mu. (.lambda.) assumes positive slopes at the slip value to be adjusted. In addition to the advantage of greater cornering forces, the concept presented offers the opportunity of purposefully limiting the yawning moments engaging the vehicle during controlled braking and thereby improving control of the vehicle.