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Coupled Longitudinal and Lateral Control for Trajectory Tracking of Autonomous Vehicle Based on LTV-MPC Approach
Technical Paper
2022-01-0296
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Trajectory and velocity tracking are currently one of the core issues in autonomous vehicle control. However, most studies deal with them separately which may cause vehicle instability under extreme conditions. In this paper, a coupled longitudinal and lateral control strategy of trajectory tracking for autonomous vehicles is presented. A lateral controller is implemented with a Linear Time-Varying MPC (LTV-MPC) to generate the front steering angle required for trajectory tracking. The side-slip angle is constrained within an interval to prevent tire saturation. Furthermore, a velocity regulation module in which the reference velocity is calculated considering the curvature of the trajectory and the lateral stability criteria is designed. A longitudinal controller is proposed to provide the traction torque with the obtained reference velocity to cope with the longitudinal velocity tracking problem. Finally, the longitudinal and lateral controllers are combined to improve the performance of control. The results of co-simulation implemented on CarSim-Simulink demonstrate that the proposed control strategy performs a satisfactory level of tracking accuracy and vehicle stability under varying conditions.
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Citation
Chen, R., Chen, Z., Duan, Y., Wu, J. et al., "Coupled Longitudinal and Lateral Control for Trajectory Tracking of Autonomous Vehicle Based on LTV-MPC Approach," SAE Technical Paper 2022-01-0296, 2022, https://doi.org/10.4271/2022-01-0296.Also In
References
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