安全でロバストな自動運転のためのリスク感受性と不確実性を考慮した意思決定・制御フレームワーク
A Risk-Sensitive and Uncertainty-Aware Decision-Making and Control Framework for Safe and Robust Autonomous Driving
リスク感受性分布強化学習とアンサンブル不確実性推定を組み合わせ、不確実性に応じて制約を適応調整するHOCBF安全補正機構を備えた自動運転意思決定・制御フレームワークを提案。無信号交差点でのシミュレーションで安全性・効率・ロバスト性のバランスを実証。
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著者: Zhuoren Li, Ran Yu, Weiqi Zhang, Ming Liu, Lu Xiong, Chen Sun, Bo Leng
分類: cs.RO
原文アブストラクト
Reinforcement learning (RL) has demonstrated considerable potential for autonomous driving decision-making. However, its deployment in urban autonomous driving, particularly at highly interactive unsignalized intersections, remains challenging, as learned policies may struggle to maintain both safety and robust decision-making in complex traffic situations. Conventional safety-filtering approaches typically employ fixed conservative constraints, which may improve safety at the cost of excessive intervention and degraded traffic efficiency. To address these limitations, we propose a Risk-sensitive and Uncertainty-aware Decision-making and Control (RUDC) framework for safe and robust autonomous driving. RUDC couples risk-sensitive distributional RL with ensemble-based policy uncertainty quantification, jointly accounting for tail risks in return distributions and uncertainty in learned policies. An uncertainty-aware high-order control barrier function (HOCBF)-based safety correction mechanism adaptively adjusts constraint strictness according to policy uncertainty, while a learnable residual predictor compensates for CBF model mismatches and discretization errors. Extensive simulations at unsignalized intersections demonstrate that RUDC achieves a favorable balance among safety, efficiency, and robustness, outperforming representative safe RL baselines under both nominal and challenging OOD and long-tail scenarios while satisfying real-time requirements.