Upper bounds of lateral tire slip loss minimization during daily driving using torque vectoring

Preprint, 2022

Previous research has shown the potential of reducing the power consumption during cornering using torque vectoring. However, the results are either closely related to the efficiencies of the electric motors used to realize the direct yaw moment, or not put into context of the total energy of transportation. In this study, the effect of direct yaw moment on lateral tire slip power loss is investigated and put into relation with the total power consumption in mild steady state cornering for four different levels of understeer. An expression for the optimal direct yaw moment is derived and is validated in simulation using a high fidelity CarMaker model where it was found that up to 2.9 % in lateral tire slip loss can be reduced depending on the understeer gradient. However, this reduction is negated by an increase in longitudinal tire slip losses generated through torque vectoring. Minimizing the total tire slip losses, up to 0.16 % could be saved considering the total power consumption of the vehicle during the maneuver.