Method for improving the controllabilty of motor vehicles

US5668724A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Thomas Ehret · Montceau-les-Mines, FR
• Friedrich Kost · Kornwestheim, DE
• Uwe Hartmann · Stuttgart, DE
• Rainer Erhardt · Stuttgart, DE
• Anton Van Zanten · Ditzingen, DE
• Gerd Busch · Gerlingen, DE
• Karl-Josef Weiss · Bensheim, DE
• Wolf-Dieter Ruf · Schwäbisch Gmünd, DE

Key dates

• Filing date: Sep 11, 1995
• Grant date: Sep 16, 1997
• Expiry date: Sep 11, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T2270/86
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for improving the controllability of motor vehicles during braking wherein desired slip values are determined and adjusted with the aid of a wheel slip controller. According to the method, the following are measured: the yaw rate .psi., the steering angle .delta., the wheel speeds V.sub.Ri, the inlet pressure P.sub.inlet or wheel brake pressure P.sub.i, and, if required, the engine speed and the throttle valve angle. The following variables are estimated using the measured values: the longitudinal vehicle speed V.sub.X, the longitudinal vehicle acceleration V.sub.X, the wheel slip values .lambda..sub.i, the braking forces F.sub.Bi, the tire forces F.sub.Ri, and the transverse speed V.sub.Y. Desired slip values .lambda..sub.i * are then determined from these measured and estimated variables with the aid of a simple vehicle model and supplied to the slip controller to control the vehicle wheel brake pressure.