Authors: Chong Feng Nenggen Ding Yongling He Guoyan Xu Feng Gao
Publish Date: 2014/10/17
Volume: 21, Issue: 10, Pages: 3705-3712
Abstract
A control allocation algorithm based on pseudoinverse method was proposed for the overactuated system of four inwheel motors independently driving and fourwheel steeringbywire electric vehicles in order to improve the vehicle stability The control algorithm was developed using a twodegreeoffreedom DOF vehicle model A pseudo control vector was calculated by a sliding mode controller to minimize the difference between the desired and actual vehicle motions A pseudoinverse controller then allocated the control inputs which included driving torques and steering angles of the four wheels according to the pseudo control vector If one or more actuators were saturated or in a failure state the control inputs are reallocated by the algorithm The algorithm was evaluated in Matlab/Simulink by using an 8DOF nonlinear vehicle model Simulations of sinusoidal input maneuver and double lane change maneuver were executed and the results were compared with those for a sliding mode control The simulation results show that the vehicle controlled by the control allocation algorithm has better stability and trajectorytracking performance than the vehicle controlled by the sliding mode control The vehicle controlled by the control allocation algorithm still has good handling and stability when one or more actuators are saturated or in a failure situation
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