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Hierarchical Lateral Control Scheme for Autonomous Vehicle with Uneven Time Delays Induced by Vision Sensors

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
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Sensors 2018, 18(8), 2544; https://doi.org/10.3390/s18082544
Received: 7 July 2018 / Revised: 31 July 2018 / Accepted: 2 August 2018 / Published: 3 August 2018
(This article belongs to the Section Intelligent Sensors)
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Abstract

Vision-based sensors are widely used in lateral control of autonomous vehicles, but the large computational cost of the visual algorithms often induces uneven time delays. In this paper, a hierarchical vision-based lateral control scheme is proposed, where the upper controller is designed by robust H-based linear quadratic regulator (LQR) algorithm to compensate sensor-induced delays, and the lower controller is based on logic threshold method, in order to achieve strong convergence of the steering angle. Firstly, the vehicle lateral model is built, and the nonlinear uncertainties induced by time delays are linearized with Taylor expansion. Secondly, the state space of the system is augmented to describe such uncertainties with polytopic inclusions, which is controlled by an H-based LQR controller with a low cost of online computation. Then, a lower controller is designed for the control of the steering motor. According to the results of the vehicle experiment as well as the hardware-in-the-loop (HIL) experiment, the proposed control scheme shows good performance in vehicle’s lateral control task, and exhibits better robustness compared with a conventional LQR controller. The proposed control scheme provides a feasible solution for the lateral control of autonomous driving. View Full-Text
Keywords: autonomous driving; hierarchical controller; robust control; linear quadratic regulator (LQR); lateral tracking control; vision sensors; uneven sensor delays autonomous driving; hierarchical controller; robust control; linear quadratic regulator (LQR); lateral tracking control; vision sensors; uneven sensor delays
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Liu, Q.; Liu, Y.; Liu, C.; Chen, B.; Zhang, W.; Li, L.; Ji, X. Hierarchical Lateral Control Scheme for Autonomous Vehicle with Uneven Time Delays Induced by Vision Sensors. Sensors 2018, 18, 2544.

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