The Influence of Vertical Suspension Friction on Planar Vehicle Dynamics

Abstract

This study analyzes the impact of vertical suspension friction on vehicle planar dynamics. The friction component reduces the roll angle gain relative to steering. Furthermore, it was found that, in roll understeer design, it increases the vehicle response gain at low frequencies and small steering angles, and thus acts in the direction of reduced vehicle stability in the on-centre region. A new evaluation method that can reveal minute differences in vehicle response was proposed by conducting slow-ramp input tests and using the driving trajectory as the evaluation target.