On the handling performance of a vehicle with different front-to-rear wheel torque distributions

LENZO, Basilio, BUCCHI, Francesco, SORNIOTTI, Aldo and FRENDO, Francesco (2018). On the handling performance of a vehicle with different front-to-rear wheel torque distributions. Vehicle System Dynamics.

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Link to published version:: https://doi.org/10.1080/00423114.2018.1546013

Abstract

The handling characteristic is a classical topic of vehicle dynamics. Usually, vehicle handling is studied through the analysis of the understeer coe�cient in quasi-steady-state maneuvers. In this paper, experimental tests are performed on an electric vehicle with four independent mo- tors, which is able to reproduce front-wheel-drive, rear-wheel-drive and all-wheel-drive (FWD, RWD and AWD, respectively) architectures. The handling characteristics of each architecture are inferred through classical and new concepts. More speci�cally, the study presents a pro- cedure to compute the longitudinal and lateral tire forces, which is based on a �rst estimate and a subsequent correction of the tire forces that guarantee the equilibrium. A yaw moment analysis is then performed to identify the contributions of the longitudinal and lateral forces. The results show a good agreement between the classical and new formulations of the un- dersteer coe�cient, and allow to infer a relationship between the understeer coe�cient and the yaw moment analysis. The handling characteristics for the considered maneuvers vary with the vehicle speed and front-to-rear wheel torque distribution. In particular, an apparently surprising result arises at low speed, where the RWD architecture is the most understeering con�guration. This outcome is discussed through the yaw moment analysis, highlighting the yaw moment caused by the longitudinal forces of the front tires, which is signi�cant for high values of lateral acceleration and steering angle.

Item Type: Article
Uncontrolled Keywords: 01 Mathematical Sciences; 09 Engineering; Automobile Design & Engineering
Identification Number: https://doi.org/10.1080/00423114.2018.1546013
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 12 Nov 2018 16:04
Last Modified: 10 Dec 2018 14:40
URI: http://shura.shu.ac.uk/id/eprint/23270

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