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International Journal of Automotive Technology > Volume 19(4); 2018 > Article
International Journal of Automotive Technology 2018;19(4): 695-703.
HIERARCHICAL DIRECT YAW-MOMENT CONTROL SYSTEM DESIGN FOR IN-WHEEL MOTOR DRIVEN ELECTRIC VEHICLE
Shi Yue, Yu Fan
Shanghai Jiao Tong University
ABSTRACT
In this study, a hierarchical structured direct yaw-moment control (DYC) system, which consists of a main-loop controller and a servo-loop controller, is designed to enhance the handling and stability of an in-wheel motor driven driven electric vehicle (IEV). In the main loop, a Fractional Order PID (FO-PID) controller is proposed to generate desired external yaw moment. A modified Differential Evolution (M-DE) algorithm is adopted to optimize the controller parameters. In the servo-loop controller, the desired external yaw moment is optimally distributed to individual wheel torques by using sequential quadratic programming (SQP) approach, with the tire force boundaries estimated by Unscented Kalman Filter (UKF) based on a fitted empirical tire model. The IEV prototype is virtually modelled by using Adams/Car collaborating with SolidWorks, validated by track tests, and serves as the control plant for simulation. The feasibility and effectiveness of the designed control system are examined by simulations in typical handling maneuver scenarios.
Key Words: FO-PID control, Vehicle stability control, Unscented kalman filter, Electric vehicle, Torque allocation
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