Shimmy Analysis of Differential Steering-by-Wire System for Electric Vehicles with In-Wheel Motors and Steering Trapezoidal Mechanism Hubei University of Automotive Technology

Format:

Book

Conference/Event

Author/Creator:

Zhao, Huiyong, author.

Contributor:

Feng, Ying

Liang, Guocai

Wang, Baohua

Conference Name:

Automotive Technical Papers (2025-01-01 : Warrendale, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

The differential steering-by-wire (DSBW) system eliminates the need for steering gear, id est, rack and pinion, while preserving a trapezoidal steering structure with knuckles. This design offers significant advantages for vehicles equipped with in-wheel motors, primarily due to reduced vehicle weight and the maintenance of front wheel alignment parameters. However, the noise force acting on one steering wheel will directly transmit to the other in this differential steering mechanism due to a lack of mechanical connection to the vehicle body through the steering gear, which increases the risk of steering wheel shimmy (SWS). This article qualitatively analyzes the shimmy characteristics of the steering wheel based on a three-degrees-of-freedom (3-DOF) DSBW shimmy model established using Lagrange's equation and the Hopf bifurcation theorem. The results indicate the vehicle range that this steering system will shimmy, and the maximum steady amplitude is [4.80 m/s, 31.57 m/s] and 0.1516 rad, respectively, much bigger than those of the traditional steering systems incorporating steering gear. Key parameters, such as wheel weight, half the length of tire patch, and caster angle, are found to substantially affect the shimmy characteristics of the steering system. Furthermore, the stiffness and damping coefficients of the tie rod influence the phase offset of the steering angle between the left and right wheels, whereas the effects of other parameters, including the stiffness and damping coefficients of the suspension, are relatively minor

Notes:

Vendor supplied data

Publisher Number:

2025-01-5049

Access Restriction:

Restricted for use by site license