An analytical method to study control strategy of torque-vectoring transmissions for Electric Vehicles using MATLAB Simulink

Torque Vectoring offers drive flexibility and continuous individual wheel torque regulation, which is unavailable in conventional transmission systems. Electric Vehicles with multiple drivetrains and torque-vectoring system can significantly enhance vehicle response and handling, and thus the active safety, efficiency, and performance of the vehicle in all driving conditions. The current methodology of predicting performance characteristics is limited through slip rate calculations, yaw rate calculations. The performance evaluations with above said methodologies holds good for dynamic cornering. Whereas in the scenarios where the vehicle in straight drive with split wheel traction requirements (Different μ scenario) and requires torque vectoring, these methods does not help to evaluate the performance of vehicle. As these methodologies based on predicting dynamic C.G values. In the proposed methodology, torque-vectoring condition during straight road scenarios evaluated along with dynamic cornering using various control strategies. The traction available at each wheel due to different road conditions taken in consideration for evaluating the performance requirements of a vehicle. A MATLAB Simulink Model of an electric vehicle with above said parameters considered to develop to perform simulation, which in a way overcomes the split traction requirements in both straight drive and dynamic cornering based on feedback. The study focuses on evaluating various parameters such as energy demand, torque distribution, steer angle, lateral acceleration, and longitudinal acceleration in different driving scenarios. Conclusion • With the methodology presented in the paper, characteristic performance of torque vectoring system with consideration of wheel traction requirements to be studied. • Various control strategies compared in consideration of parameters like Slip ratio, Lateral acceleration, and Yaw rate. • The influence of split traction (split μ condition) on straight road conditions and dynamic cornering to be studied in comparison with existing methodology of evaluating performance through Yaw rate technique.