Control system for steering a road vehicle having both front-wheel steering and rear wheel steering

US5515275A · kind A · utility

Assignee

• Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.V. · DE

Inventor

• Jurgen Ackermann · Bensberg, DE

Key dates

• Filing date: Nov 9, 1994
• Grant date: May 7, 1996
• Expiry date: Nov 9, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60G2800/962
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A control system for steering a road vehicle having front-wheel and rear-wheel steering, comprising a wheel base l (in m), a rear cornering stiffness c.sub.h (in N/rad), a center of gravity distance l.sub.v (in m) from the front axle and a mass m (in kg) and provided with a decoupled control circuit, a predetermined yaw damping D.sub.G is adjusted according to a damping parameter ##EQU1## via the steering of the rear wheels through an angle .delta..sub.h (in rad). Herewith the yaw rate r (in rad/s), travelling velocity v (in m/s) and steering wheel angle .delta..sub.L (in rad) are measured and the angle .delta..sub.h =(l/v-k.sub.D) (w.sub.h -r) is calculated by a microprocessor, whereby w.sub.h is formed as command variable from the measured steering wheel angle (.delta..sub.L) by a prefilter (F.sub.h) associated with the rear-wheel steering.