Understeer characteristics for energy-efficient fully electric vehicles with multiple motors

LENZO, Basilio, SORNIOTTI, A, DE FILIPPIS, G, GRUBER, P and SANNEN, K (2016). Understeer characteristics for energy-efficient fully electric vehicles with multiple motors. In: EVS29 International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium Proceedings, Montreal, Quebec, 19-22 June 2016. (Unpublished)

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Electric vehicles with multiple motors allow torque-vectoring, which generates a yaw moment by assigning different motor torques at the left and right wheels. This permits designing the steady-state cornering response according to several vehicle handling quality targets. For example, as widely discussed in the literature, to make the vehicle more sports-oriented, it is possible to reduce the understeer gradient and increase the maximum lateral acceleration with respect to the same vehicle without torque-vectoring. This paper focuses on the novel experimentally-based design of a reference vehicle understeer characteristic providing energy efficiency enhancement over the whole range of achievable lateral accelerations. Experiments show that an appropriate tuning of the reference understeer characteristic, i.e., the reference yaw rate of the torque-vectoring controller, can bring energy savings of up to ~11% for a case study four-wheel-drive electric vehicle demonstrator. Moreover, during constant speed cornering, it is more efficient to significantly reduce the level of vehicle understeer, with respect to the same vehicle with even torque distribution on the left and right wheels.

Item Type: Conference or Workshop Item (Paper)
Depositing User: Basilio Lenzo
Date Deposited: 09 Nov 2016 11:13
Last Modified: 18 Mar 2021 15:33
URI: https://shura.shu.ac.uk/id/eprint/13975

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