Study and design of torque vectoring techniques for electric vehicles

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Varga Zoltán
Department of Automation and Applied Informatics

In the last twenty years being environmental-friendly is not only a hobby but a must, for regular people, for governments and factories, the industry too. This concerns car manufacturers greatly as the sector of vehicles is responsible for a significant part of air pollution.

This essay first gives an overview of the currently available vehicles on the industry, particularly focused on the electric vehicles (EV). After a short summary of EV history and development, the classification of full electric and hybrid electric vehicles is discussed. Then the principle of these different kind of EVs are introduced by giving examples of today’s vehicles on the market. To give a deeper insight into the electric vehicles’ powertrain, its elements are examined separately, especially focusing on the electric motors, the brushless direct current (BLDC) motor. Also the problem of the differentials is concerned to reveal the opportunities in mechanical and electronic differentials, control methods.

Based on the overview of EV powertrain, BLDC motor and electronic differential techniques, a simulation model in MatLAB® Simulink® is built, in which the six-step control method is realized for two BLDC motors. The motors are interconnected into a vehicle model by torque vectoring application. To implement torque vectoring a dynamic model of a two-wheel-driven vehicle with four wheel steering is needed to be set up.

Several different simulations are made on this model to examine the operation of torque vectoring on the BLDC drive, such as acceleration and deceleration, cornering with different parameters and a complex simulation as well.


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