Improved Control Strategy for 4 WD Electric Vehicle Using Direct Torque Control Technique with Space Vector Modulation

In this paper, an improved control techique for an electric vehicle (EV) based on four-wheel-drive (4WD) has been proposed using the direct torque control with space vector modulation (DTC-SVM) technique. The lithium battery is modelled as DC source, buck-boost converter is used for DC voltage level adjustment, and mechanical load has been used in the model. The driving dynamics are controlled by independent control of each vehicle speed by the differential system calculations for adapting to varying requirements and conditions during the turning of the vehicle. The torque and power are computed individually for the wheels. The battery is kept charged up to 70% of the state of charge (SOC) and the proposed model was tested at various speeds of the vehicle to determine its functionality. The simulations are carried out in MATLAB / Simulink environment which validated the superior performance of the proposed model. The results demonstrate that the proposed method can be successfully applied to modern traction applications.