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International Journal of Automotive Technology > Volume 20(4); 2019 > Article
International Journal of Automotive Technology 2019;20(4): 827-834.
doi: https://doi.org/10.1007/s12239-019-0077-9
ANALYSIS OF STEERING RETURNABILITY AND COMPENSATION LOGIC DEVELOPMET IN LIMIT CORNERING CONDITION
Han Seung Lee, Dae Suk Jung, Jae Kil Lee
Hyundai Motors Company
PDF Links Corresponding Author.  Jae Kil Lee , Email. worlf@hyundai.com
ABSTRACT
This paper describes steering returnability by analyzing forces applied to kingpin axis in limit cornering conditions. The steering returnability is related to forces applied to kingpin axis. These forces are classified by its source: Tire force and steering force. Tire force is generated from tire such as longitudinal, lateral, vertical force, and residual self-aligning torque. Steering force consists of friction force and assist force. These forces are vectorized by suspension geometry and calculated with respect to kingpin axis. The simulation results are compared with measurement data and verifies that steering returnability can be formulated by tire forces and steering forces. Using these relations, this paper proposes new steering control logics at limit driving conditions. This logic is verified by simulation model to check performance and confirmed in various test conditions for robustness.
Key Words: Steering system, Suspension system, Kinematics mechanism, Geometry, Returnability, Kingpin axis
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