Title: Steering pull and drift considering road wheel alignment tolerance during high-speed driving

Authors: Y.G. Cho

Addresses: Hyundai Motor Company, 772-1 Jangduk-Dong, Hwaseong-Si, Gyeonggi-Do, 445-706, Korea

Abstract: This paper describes an analytical vehicle model and a full-vehicle model that consider the effect of suspension geometry on steering pull and drift. Steering pull occurs when a driver applies steering wheel torque to keep a straight-line course, and steering drift means the tendency to deviate from the intended path with a free steering wheel. In designing a chassis system, it is crucial to establish a suspension insensitive to steering pull and drift regardless of manufacturing tolerances. Simulation results show that larger caster trail at the front wheel leads a less-sensitive vehicle towards steering pull and drift, since caster trail reduces the equilibrium slip angle difference between pull and drift by considerably changing the aligning moment diagram. These wheel alignment sensitivities are validated by experimental measurement of drift distance.

Keywords: steering pull; steering drift; wheel alignment sensitivities; suspension geometry; caster trail; high-speed driving; vehicle modelling; vehicle design; vehicle suspension; chassis design; manufacturing tolerances; simulation; aligning moment diagram.

DOI: 10.1504/IJVD.2010.034871

International Journal of Vehicle Design, 2010 Vol.54 No.1, pp.73 - 91

Published online: 26 Aug 2010 *

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