1 Vehicle Modeling and Performance Evaluation Using Active torque Distribution Rizwan Latif, Muhammad Adnan, Raja Amir Azim, Aamer Ahmed Baqai, Nabeel Kamal, Imran Shafi Department of Mechanical Engineering, NUST College of Electrical & Mechanical Engineering, National University of Sciences & Technology, Islamabad, Pakistan, 46000 rizwanlatif95@yahoo.com Abstract — The main aim of researchers, to prevent the spinning and drifting of vehicle, is to monitor the yaw stability control strategy. The yaw stability control system is integrated with active torque distribution. A lot of work is done on torque distribution between right and left wheels using active differential to distribute torque to each drive wheel. Control algorithm based on different control strategies were used for torque distribution. In this study, active torque distribution strategy is incorporated via central transfer case between front and rear axle. A 4WD vehicle is used with 50-50 torque ratio amongst front and rear axle. The controlling parameter is the understeer and oversteer behavior of the vehicle. A combined slip model approach used by Burckhardt is used for a 10 DOF vehicle modeling using MATLAB coding. The simulated results will be compared against a multibody nonlinear simulation software i.e. CarSim. For the validation procedure, different control strategies evolved for oversteer and understeer will be tested on J-turn test. Keywords: CarSim, vehicle dynamics, ESC, MATLAB, combined slip I. INTRODUCTION In the recent past a lot of effort has been done to prevent vehicles form accidents especially single vehicle rollover. With the emergence of automobile industry, vehicle dynamics control systems have been developed to improve control and safety of vehicles. The control of drivers over their vehicle is the primary concern of vehicle dynamics control systems, which seeks to prevent unintended vehicle behavior through active control of different assemblies and help the drivers to maintain control of their vehicles. A few major systems that have become common equipment in production passenger vehicles are, Anti-lock Brake Systems (ABS) to prevent wheel lock-up, and traction control systems to prevent the drive wheels from losing grip when accelerating [2]. An extension of antilock brake technology, electronic stability control (ESC) is designed to help drivers retain control of their vehicles during high-speed maneuvers or on slippery roads. The new research confirms that ESC