In this paper, dynamic wheel alignments are analysed through comparison with static wheel alignments when severe braking force is applied. The measured front toe angles initially turn to the toe-in direction due to braking force, and then to toe-out direction due to the wheel bump stroke. Otherwise, the front camber angles are changed to the negative direction by both braking force and wheel bump stroke. When the right wheel is heavier than the left wheel, the vehicle drifts to the left side due to yawing moment; the toe angle at the left wheel becomes greater than the toe angle at the right wheel, but the lateral tyre force at the right wheel is greater than that at the left wheel. On the other hand, when the left wheel is heavier than the right wheel, the toe angle becomes adverse and pushes the vehicle to the right side. Thus, the suspension condition that best controls any tendency towards steering drift is one that ensures minimum side-to-side toe angle. Tyre lateral force induced by toe alternation is the main reason for steering drift under straight braking. Through the suspension parametric studies, suspension factors contributing to drift are found as toe angle, caster angle, suspension bushing stiffness and kingpin offset at the ground. To ensure minimal side to side drift, the minimised toe angle should be obtained through compensating bump toe and braking toe.
Static and dynamic wheel alignment analysis of steering drift under straight braking
International Journal of Vehicle Design ; 56 , 1-4 ; 4-18
2011
15 Seiten, 14 Bilder, 3 Tabellen, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
Static and dynamic wheel alignment analysis of steering drift under straight braking
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