In this work, advantages through torque vectoring for a rear-driven car were shown. First, driving safety problems of tail-heavy vehicles and potentials to overcome them via free wheel torque distribution were discussed. It was shown that cars with torque vectoring at their rear axis potentially can be stabilized even at breaking while cornering. To underline the effectiveness of such a vehicle architecture, simulations of several driving maneuvers where performed. The simulations where carried out in Matlab/Simulink using a 5 body simulation vehicle with 16 degrees of freedom. As reference value, a car with well-balanced axle load was used. By raising the rear axle load to 60 %, the relevant characteristics for evaluation vehicle dynamics became worse for nearly all situations. By the use of appropriate feed-forward controls, each maneuver could be stabilized and performance could almost be adapted to the reference values of the well-balanced car. These results go along with the scientific findings of Meißner, who proved that torque vectoring can improve the driving behavior of a all-wheel-driven car with torque vectoring at its rear axis, as well as the proceedings of Graf, Wiesbeck and Lienkamp, who experienced that the recuperation potential can be increased by the use of torque vectoring. Remarkably are the results for braking while cornering. While the uncontrolled, rear braked car spins out and becomes instable, the controlled car shows even less oscillations in side slip angle and yaw rate than the reference value.
Vehicle dynamics per software - potentials of an electric single wheel drive
2012
19 Seiten, 17 Bilder, 12 Quellen
Conference paper
English
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